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Michaël Zasso
38d261ae66
Original commit message:
[wasm] Fix deadlock in async wrapper compilation
If compilation is cancelled while wrapper compilation is running, the
tasks spawned for the {AsyncCompileJSToWasmWrapperJob} will return
immediately, but {GetMaxConcurrency} will still return a positive
value. Hence {Join()} will spawn another task, resulting in a
livelock.
We could fix this by checking for cancellation in {GetMaxConcurrency},
but that requires taking the compilation state lock.
So this CL fixes the issue by dropping the number of outstanding
compilation units by to (basically) zero. We can't unconditionally drop
to zero because another thread might concurrently execute a wrapper
compilation and still call {CompleteUnit} afterwards. Hence only drop
outstanding units by the amount of not-yet-started units.
R=jkummerow@chromium.org
Bug: v8:13858
Change-Id: I5398ef370da2e7f212ca772fd1f87f659929dd6d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4437531
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#87143}
Refs: https://github.com/v8/v8/commit/5f025d1ca2ca2fe2f6cee5b6d841907a36fd32b7
PR-URL: https://github.com/nodejs/node/pull/47610
Refs: https://github.com/nodejs/node/issues/47297
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
V8 JavaScript Engine
V8 is Google's open source JavaScript engine.
V8 implements ECMAScript as specified in ECMA-262.
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