wasmtime / issue #5791 Cranelift: Regalloc checker error ... · git-wasmtime

Stream: git-wasmtime

Topic: wasmtime / issue #5791 Cranelift: Regalloc checker error ...

Wasmtime GitHub notifications bot (Feb 15 2023 at 18:27):

afonso360 opened issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Wasmtime GitHub notifications bot (Feb 15 2023 at 18:27):

afonso360 labeled issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Wasmtime GitHub notifications bot (Feb 15 2023 at 18:27):

afonso360 labeled issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Wasmtime GitHub notifications bot (Feb 15 2023 at 18:29):

afonso360 labeled issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Wasmtime GitHub notifications bot (Feb 15 2023 at 20:55):

afonso360 commented on issue #5791:

Minimized testcase after the fix provided by @elliottt in #5794 (Thanks!).

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v4 = iconst.i8 0
    v120 = iconst.i64 0
    v31 = uextend.i128 v120
    v81 = ushr v4, v31
    jump block5

block5:
    brif.i8 v81, block6(v81), block12

block6(v35: i8):
    brif v35, block12, block12

block12:
    return v4
}

git bisect points the offending commit at 116e5a665f6d8069c894f966e424ad1aae6558fa

Wasmtime GitHub notifications bot (Feb 15 2023 at 21:01):

cfallin commented on issue #5791:

Taking a look...

Wasmtime GitHub notifications bot (Feb 15 2023 at 22:23):

cfallin commented on issue #5791:

This appears to be a weird checker edge-case. The VCode has an empty-body block at block0 with nothing but a jump to block5; the egraph global-code motion sinks all of the ops in block0 out of the block. The checker runs an abstract interpretation of the VCode with regalloc assignments in a fixpoint workqueue; it processes block0, with a starting state of Top and (because there are no body instructions) an ending state of Top as well. It meets this into the one successor's (block5's) input state, which started at Top and remains Top. This is not a change, so the successor is not pushed onto the workqueue, and the analysis ends there. Then there are missing symbolic contents of all registers in all other blocks, and we falsely flag checker errors. The fix is to ensure we visit every block at least once (or I guess to define a separate lattice element below Top that indicates we've visited the block; I'll play with both).

So tl;dr: no codegen bug, but rather checker stopping prematurely because of empty block.

Wasmtime GitHub notifications bot (Feb 16 2023 at 00:47):

cfallin commented on issue #5791:

Fixed in bytecodealliance/regalloc2#113; once that merges I'll make a release and pull it in here.

Wasmtime GitHub notifications bot (Feb 16 2023 at 01:42):

cfallin closed issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Wasmtime GitHub notifications bot (Feb 16 2023 at 01:44):

cfallin commented on issue #5791:

Err, re-opening; the regalloc2 PR fixes the issue but it's not fixed here until we pull in the new version.

Wasmtime GitHub notifications bot (Feb 16 2023 at 01:44):

cfallin reopened issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Wasmtime GitHub notifications bot (Feb 16 2023 at 02:03):

cfallin closed issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Wasmtime GitHub notifications bot (Feb 16 2023 at 02:04):

cfallin commented on issue #5791:

GitHub really likes to auto-close issues, doesn't it?

Wasmtime GitHub notifications bot (Feb 16 2023 at 02:04):

cfallin reopened issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Wasmtime GitHub notifications bot (Feb 16 2023 at 03:23):

cfallin closed issue #5791:

:wave: Hey,

I was fuzzing an unrelated PR and got this test case from fuzzgen, which also reproduces on the current main branch.

Additionally I tried to minimize this via bugpoint, and it also crashed, but I'll file that as a separate issue.

`.clif` Test Case

test compile
set opt_level=speed
set regalloc_checker=true
target x86_64

function %a() -> i8 system_v {
block0:
    v58 = f32const -0x1.696968p-22
    v59 = f32const -0x1.b16968p50
    v60 = f32const 0x0.0001a2p-126
    v61 = iconst.i16 81
    v62 = f64const 0x0.000000001d800p-1022
    v63 = iconst.i8 12
    v64 = iconst.i16 -105
    v65 = iconst.i64 0x9797_9797_9797_ffff
    v66 = iconst.i64 0x9797_8797_9797_9797
    v67 = iconst.i64 0x2a57_5757_5797_9797
    v68 = iconcat v67, v66  ; v67 = 0x2a57_5757_5797_9797, v66 = 0x9797_8797_9797_9797
    v69 = iconst.i32 0x4141_4141
    v70 = iconst.i8 0
    v71 = iconst.i16 0
    v72 = iconst.i32 0
    v73 = iconst.i64 0
    v74 = uextend.i128 v73  ; v73 = 0
    jump block1(v64, v62, v65, v62, v63, v65, v69, v68, v60, v68, v68, v68)  ; v64 = -105, v62 = 0x0.000000001d800p-1022, v65 = 0x9797_9797_9797_ffff, v62 = 0x0.000000001d800p-1022, v63 = 12, v65 = 0x9797_9797_9797_ffff, v69 = 0x4141_4141, v60 = 0x0.0001a2p-126

block1(v0: i16, v1: f64, v2: i64, v3: f64, v4: i8, v5: i64, v6: i32, v7: i128, v8: f32, v9: i128, v10: i128, v11: i128):
    brif v4, block2(v3, v3, v0, v3, v5, v3, v4, v5, v6, v11, v8, v11), block4(v11, v3, v0, v4, v8, v5, v6)

block2(v12: f64, v13: f64, v14: i16, v15: f64, v16: i64, v17: f64, v18: i8, v19: i64, v20: i32, v21: i128, v22: f32, v23: i128) cold:
    v76 -> v18
    v75 -> v23
    brif v18, block3(v19), block8(v23, v17, v14, v19, v18, v20, v22)

block3(v24: i64) cold:
    brif.i8 v76, block4(v75, v17, v14, v76, v22, v24, v20), block7(v75, v17, v14, v24, v76, v20, v22)

block4(v25: i128, v77: f64, v78: i16, v79: i8, v90: f32, v94: i64, v99: i32) cold:
    v80 -> v79
    v82 -> v90
    brif v79, block5(v77, v77, v77, v78, v77, v25, v77, v77, v77), block12(v25)

block5(v26: f64, v27: f64, v28: f64, v29: i16, v30: f64, v31: i128, v32: f64, v33: f64, v34: f64) cold:
    v81 = ushr.i8 v80, v31
    brif v81, block6(v81, v29, v34, v31, v82, v31), block9(v34, v29, v94, v81, v99, v31, v82)

block6(v35: i8, v36: i16, v37: f64, v38: i128, v39: f32, v40: i128) cold:
    brif v35, block7(v40, v37, v36, v94, v35, v99, v39), block7(v40, v37, v36, v94, v35, v99, v39)

block7(v41: i128, v91: f64, v93: i16, v96: i64, v98: i8, v101: i32, v103: f32) cold:
    jump block8(v41, v91, v93, v96, v98, v101, v103)

block8(v42: i128, v83: f64, v92: i16, v95: i64, v97: i8, v100: i32, v102: f32) cold:
    jump block9(v83, v92, v95, v97, v100, v42, v102)

block9(v43: f64, v84: i16, v85: i64, v86: i8, v87: i32, v88: i128, v89: f32) cold:
    jump block10(v84, v43, v85, v43, v86, v85, v87, v88, v89, v88, v88, v88)

block10(v44: i16, v45: f64, v46: i64, v47: f64, v48: i8, v49: i64, v50: i32, v51: i128, v52: f32, v53: i128, v54: i128, v55: i128):
    jump block11(v55)

block11(v56: i128) cold:
    jump block12(v56)

block12(v57: i128) cold:
    v111 = iconst.i8 0
    return v111
}

Steps to Reproduce

clif-util test ./the-above.clif

Expected Results

The test to pass

Actual Results

Regalloc checker error:

afonso@DESKTOP-VSTS4BC:~/git/wasmtime/cranelift$ cargo run -- test ./lmao.clif
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `/home/afonso/git/wasmtime/target/debug/clif-util test ./lmao.clif`
 ERROR cranelift_codegen::machinst::compile > Register allocation checker errors:
CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
for vcode:
VCode {
  Entry block: 0
  v128 := v157
  v129 := v156
  v130 := v155
  v131 := v152
  v132 := v151
  v133 := v150
  v134 := v149
  v135 := v133
  v136 := v134
  v137 := v148
  v142 := v143
Block 0:
    (original IR block: block0)
    (successor: Block 1)
    (instruction range: 0 .. 1)
  Inst 0: jmp     label1
Block 1:
    (original IR block: block1)
    (successor: Block 2)
    (successor: Block 7)
    (instruction range: 1 .. 4)
  Inst 1: movl    $12, %v157l
  Inst 2: testb   %v128b, %v128b
  Inst 3: jnz     label2; j label7
Block 2:
    (original IR block: block2)
    (successor: Block 3)
    (successor: Block 6)
    (instruction range: 4 .. 7)
  Inst 4: movl    $12, %v156l
  Inst 5: testb   %v129b, %v129b
  Inst 6: jnz     label3; j label6
Block 3:
    (original IR block: block3)
    (successor: Block 4)
    (successor: Block 5)
    (instruction range: 7 .. 10)
  Inst 7: movl    $12, %v155l
  Inst 8: testb   %v130b, %v130b
  Inst 9: jnz     label4; j label5
Block 4:
    (successor: Block 8)
    (instruction range: 10 .. 11)
  Inst 10: jmp     label8
Block 5:
    (successor: Block 13)
    (instruction range: 11 .. 12)
  Inst 11: jmp     label13
Block 6:
    (successor: Block 14)
    (instruction range: 12 .. 13)
  Inst 12: jmp     label14
Block 7:
    (successor: Block 8)
    (instruction range: 13 .. 14)
  Inst 13: jmp     label8
Block 8:
    (original IR block: block4)
    (successor: Block 9)
    (successor: Block 19)
    (instruction range: 14 .. 17)
  Inst 14: movl    $12, %v152l
  Inst 15: testb   %v131b, %v131b
  Inst 16: jnz     label9; j label19
Block 9:
    (original IR block: block5)
    (successor: Block 10)
    (successor: Block 15)
    (instruction range: 17 .. 24)
  Inst 17: movl    $12, %v151l
  Inst 18: movabsq $3051003305210124183, %v150
  Inst 19: movabsq $-7523395567346018409, %v149
  Inst 20: andq    %v135, $7, %v147
  Inst 21: shrb    %v147b, %v132b, %v148b
  Inst 22: testb   %v137b, %v137b
  Inst 23: jnz     label10; j label15
Block 10:
    (original IR block: block6)
    (successor: Block 11)
    (successor: Block 12)
    (instruction range: 24 .. 26)
  Inst 24: testb   %v137b, %v137b
  Inst 25: jnz     label11; j label12
Block 11:
    (successor: Block 13)
    (instruction range: 26 .. 27)
  Inst 26: jmp     label13
Block 12:
    (successor: Block 13)
    (instruction range: 27 .. 28)
  Inst 27: jmp     label13
Block 13:
    (original IR block: block7)
    (successor: Block 14)
    (instruction range: 28 .. 29)
  Inst 28: jmp     label14
Block 14:
    (original IR block: block8)
    (successor: Block 16)
    (instruction range: 29 .. 30)
  Inst 29: jmp     label16
Block 15:
    (successor: Block 16)
    (instruction range: 30 .. 31)
  Inst 30: jmp     label16
Block 16:
    (original IR block: block9)
    (successor: Block 17)
    (instruction range: 31 .. 32)
  Inst 31: jmp     label17
Block 17:
    (original IR block: block10)
    (successor: Block 18)
    (instruction range: 32 .. 33)
  Inst 32: jmp     label18
Block 18:
    (original IR block: block11)
    (successor: Block 20)
    (instruction range: 33 .. 34)
  Inst 33: jmp     label20
Block 19:
    (successor: Block 20)
    (instruction range: 34 .. 35)
  Inst 34: jmp     label20
Block 20:
    (original IR block: block12)
    (instruction range: 35 .. 37)
  Inst 35: xorl    %v143l, %v143l, %v143l
  Inst 36: ret %v142=%rax
}

thread 'worker #0' panicked at 'register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }', cranelift/codegen/src/machinst/compile.rs:85:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 ERROR cranelift_filetests::concurrent      > FAIL: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
FAIL ./lmao.clif: panicked in worker #0: register allocation checker: CheckerErrors { errors: [UnknownValueInAllocation { inst: Inst(24), op: Use: v148i reg, alloc: p10i }] }
1 tests
Error: 1 failure

Versions and Environment

Cranelift version or commit: e10094dcd6d0354628255a6f2e69c1e4c327d6e7 (current main)
Operating system: Linux
Architecture: x86_64

Last updated: Nov 22 2024 at 16:03 UTC

Stream: git-wasmtime

Topic: wasmtime / issue #5791 Cranelift: Regalloc checker error ...

Wasmtime GitHub notifications bot (Feb 15 2023 at 18:27):

.clif Test Case

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Wasmtime GitHub notifications bot (Feb 15 2023 at 18:27):

.clif Test Case

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Wasmtime GitHub notifications bot (Feb 15 2023 at 18:27):

.clif Test Case

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Wasmtime GitHub notifications bot (Feb 15 2023 at 18:29):

.clif Test Case

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Wasmtime GitHub notifications bot (Feb 15 2023 at 20:55):

Wasmtime GitHub notifications bot (Feb 15 2023 at 21:01):

Wasmtime GitHub notifications bot (Feb 15 2023 at 22:23):

Wasmtime GitHub notifications bot (Feb 16 2023 at 00:47):

Wasmtime GitHub notifications bot (Feb 16 2023 at 01:42):

.clif Test Case

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Wasmtime GitHub notifications bot (Feb 16 2023 at 01:44):

Wasmtime GitHub notifications bot (Feb 16 2023 at 01:44):

.clif Test Case

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Wasmtime GitHub notifications bot (Feb 16 2023 at 02:03):

.clif Test Case

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Wasmtime GitHub notifications bot (Feb 16 2023 at 02:04):

Wasmtime GitHub notifications bot (Feb 16 2023 at 02:04):

.clif Test Case

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Wasmtime GitHub notifications bot (Feb 16 2023 at 03:23):

.clif Test Case

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`.clif` Test Case

`.clif` Test Case

`.clif` Test Case

`.clif` Test Case

`.clif` Test Case

`.clif` Test Case

`.clif` Test Case

`.clif` Test Case

`.clif` Test Case