[release/7.0] Issue was that if a BGC thread handles a mark stack overflow, #74814
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…s into yet another mark stack overflow on another heap, we set a flag on the region, and the containing heap. However, the BGC handling the other heap may have already decided to move on, and may thus not see the flag. Fix is to set the flag on the heap doing the scan rather than the heap containing the object causing the mark stack stack overflow. The thread handling that heap will indeed recheck the flag and rescan if necessary. This necessitates another change because in the concurrent case, we need each BGC thread to enter mark stack overflow scanning if there was a mark stack overflow on its heap. So we need to propagate the per-heap flag to all the heaps. Fixed another issue for regions where the small_object_segments local variable in background_process_mark_overflow_internal would be set incorrectly in the non-concurrent case. It would be set to FALSE as soon as all the regions for gen 0 are processed.
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Tagging subscribers to this area: @dotnet/gc Issue DetailsBackport of #74571 to release/7.0 /cc @PeterSolMS Customer ImpactTestingRiskIMPORTANT: Is this backport for a servicing release? If so and this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.
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jeffschwMSFT
approved these changes
Aug 30, 2022
mangod9
approved these changes
Aug 30, 2022
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Got an approval and a sign-off. The CI failure was a cancelled operation due to a timeout. |
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Oh, the tests were re-executed. I'll have to wait. |
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Sorry @carlossanlop :(. I missed your comment and was doing a sweep. |
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CI re-run shows a cancellation, but no test failures. |
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Backport of #74571 to release/7.0
/cc @PeterSolMS
Customer Impact
Testing
Risk
IMPORTANT: Is this backport for a servicing release? If so and this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.