[release/8.0-staging] Fix for a stress crash in ComAwareWeakReferenceNative::HasInteropInfo #94649
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…yncblock is gone.
ghost
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jkotas
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Nov 12, 2023
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Friendly reminder: If you'd like this to be included in the December release, please merge it before Tuesday November 14th EOD (Code Complete). |
jeffschwMSFT
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Nov 14, 2023
AaronRobinsonMSFT
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Nov 14, 2023
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@AaronRobinsonMSFT @jeffschwMSFT did this end up getting Tactics approval? Today is code complete. |
@carlossanlop for January? |
No, it's code complete for December: https://dev.azure.com/devdiv/DevDiv/_wiki/wikis/DevDiv.wiki/38691/December-2023 |
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I'm starting the flow from staging to internal now, so the branches are closed. This will have to wait until the January release. |
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Backport of #94643 to release/8.0-staging
/cc @VSadov
Customer Impact
Fixes: #94579
The issue was reported by an external customer. In rare cases when creating a weak reference instance an application may crash with ExecutionEngineException in the runtime while probing for COM interop info.
The repro is a fairly large WinForms app (paint.net)
When run with
GCStress=2the crash is nearly 100% certain.Testing
Regular testing.
Manually validated that the customer repro no longer causes EE crashes. That includes running it under
GCStress=2Risk
Low. The fix is adding a missing null-check where we had an assert.
Turns out the asserted condition may not hold when racing with GC and must be handled.