Repository navigation
Add fuzzing support for relaxed atomics - #8253
Merged
Merged
Conversation
stevenfontanella
force-pushed
the
fuzzing
branch
from
January 29, 2026 23:13
cb21412 to
f4c43d5
Compare
stevenfontanella
force-pushed
the
fuzzing
branch
from
January 29, 2026 23:48
f4c43d5 to
2fa281d
Compare
stevenfontanella
marked this pull request as ready for review
January 30, 2026 01:08
kripken
reviewed
Jan 30, 2026
stevenfontanella
enabled auto-merge (squash)
January 30, 2026 18:14
stevenfontanella
added a commit
that referenced
this pull request
Feb 18, 2026
Followup to #8253 (comment). Allow us to declare `loggableTypes` and `atomicMemoryOrders` as const to prevent them from being mutated by mistake.
stevenfontanella
added a commit
that referenced
this pull request
Jul 7, 2026
Fixes #8770. The fuzzer was non-deterministic across architectures since we had two calls to `pick()` in the arguments to `makeAtomicRMW`, so the evaluation order of the two `pick` calls was non-deterministic. Fix this by pulling the function calls outside of the arguments of `makeAtomicRMW`. Also increase the fuzz metrics test seed file size (2214 bytes -> 1020 KB) to increase the likelihood of catching similar issues in CI, and exercise more instructions in the test. This bug wasn't caught by CI in #8253. Tested by basing #8885 on top of this which failed previously due to the non-determinism, and now succeeds.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Part of #8165. We already don't run v8 fuzz handlers for relaxed atomics (link) since this feature isn't implemented in V8 yet. To test, ran
fuzz_opt.pyfor ~1 hour with no failures.