Yage Hu (Nov 21 2023 at 01:20): Yage Hu (Nov 21 2023 at 01:20):Hi folks, I've been fuzzing Wasmtime by feeding it sequences of WASI calls. I've encountered a case where Wasmtime would hang > 10 seconds when calling path_open. I've minimized the call sequence to something like 500 calls. Any suggestion how I can best debug this?
Pat Hickey (Nov 21 2023 at 01:22):strace? what syscall has it hung on?
Yage Hu (Nov 21 2023 at 01:25):Looks like futex.
Pat Hickey (Nov 21 2023 at 01:25):attach gdb and see a backtrace from there?
Yage Hu (Nov 21 2023 at 01:30):Thanks for the pointer! Would I need to run wasmtime debug build for that? Do I need -D debug-info when invoking wasmtime?
Pat Hickey (Nov 21 2023 at 01:51):its probably helpful to have a wasmtime debug build, start with that before enabling -D debug-info
Pat Hickey (Nov 21 2023 at 01:52):even without a debug build the backtrace might give you some clues of where to add some debug prints
Last updated: Nov 22 2024 at 17:03 UTC