Stream: git-wasmtime

Topic: wasmtime / PR #11864 Disable single-pass regalloc in fuzz...

Wasmtime GitHub notifications bot (Oct 15 2025 at 16:11):

alexcrichton opened PR #11864 from alexcrichton:disable-single-pass to bytecodealliance:main:

This commit disables the single-pass algorithm when fuzzing due to #11850 which has discovered a few issues with it. Additionally documentation has been added to the configuration option indicating that it's not recommended for security-sensitive applications to clarify its implementation status.

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Wasmtime GitHub notifications bot (Oct 15 2025 at 16:11):

alexcrichton requested fitzgen for a review on PR #11864.

Wasmtime GitHub notifications bot (Oct 15 2025 at 16:11):

alexcrichton requested wasmtime-core-reviewers for a review on PR #11864.

Wasmtime GitHub notifications bot (Oct 15 2025 at 16:11):

alexcrichton requested wasmtime-fuzz-reviewers for a review on PR #11864.

Wasmtime GitHub notifications bot (Oct 15 2025 at 18:49):

github-actions[bot] commented on PR #11864:

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This issue or pull request has been labeled: "fuzzing", "wasmtime:api", "wasmtime:config"

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Wasmtime GitHub notifications bot (Oct 15 2025 at 19:44):

github-actions[bot] commented on PR #11864:

Label Messager: wasmtime:config

It looks like you are changing Wasmtime's configuration options. Make sure to
complete this check list:

• [ ] If you added a new Config method, you wrote extensive documentation for
  it.

  <details>

  Our documentation should be of the following form:

  ```text
  Short, simple summary sentence.

  More details. These details can be multiple paragraphs. There should be
  information about not just the method, but its parameters and results as
  well.

  Is this method fallible? If so, when can it return an error?

  Can this method panic? If so, when does it panic?

  Example

  Optional example here.
  ```

  </details>

• [ ] If you added a new Config method, or modified an existing one, you
  ensured that this configuration is exercised by the fuzz targets.

  <details>

  For example, if you expose a new strategy for allocating the next instance
  slot inside the pooling allocator, you should ensure that at least one of our
  fuzz targets exercises that new strategy.

  Often, all that is required of you is to ensure that there is a knob for this
  configuration option in [wasmtime_fuzzing::Config][fuzzing-config] (or one
  of its nested structs).

  Rarely, this may require authoring a new fuzz target to specifically test this
  configuration. See [our docs on fuzzing][fuzzing-docs] for more details.

  </details>

• [ ] If you are enabling a configuration option by default, make sure that it
  has been fuzzed for at least two weeks before turning it on by default.

[fuzzing-config]: https://github.com/bytecodealliance/wasmtime/blob/ca0e8d0a1d8cefc0496dba2f77a670571d8fdcab/crates/fuzzing/src/generators.rs#L182-L194
[fuzzing-docs]: https://docs.wasmtime.dev/contributing-fuzzing.html

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Wasmtime GitHub notifications bot (Oct 15 2025 at 21:42):

fitzgen submitted PR review.

Wasmtime GitHub notifications bot (Oct 15 2025 at 22:04):

fitzgen merged PR #11864.

Last updated: Dec 06 2025 at 07:03 UTC