Disable mark list optimization if we hit a per region mark list overflow (#86508) #87339
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Tagging subscribers to this area: @dotnet/gc Issue Detailsnull
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Maoni0
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Jun 9, 2023
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@cshung @Maoni0 this is still marked as draft. Reminder: Code Complete for the August Release is tomorrow Monday July 10th. If you intend to include this fix in that release, please make sure to get a tactics approval and get it merged before 4pm because that's when I'll start the staging merge process into internal. |
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Backport of #86508 to release/7.0-staging
Customer Impact
FASTER is a popular open-source key-value store in .NET that has production use within and across Microsoft. This bug is causing a direct impact on the usability of FASTER, for the scenario where instances are created and destroyed frequently. Fixing this will allow the safe use of FASTER in production by both Microsoft and external customers of FASTER.
The root cause of this bug is that under server GC, it is possible for us to run out of memory to store the mark list for a region. In that case, the code before the fix will assume the partially filled mark list as all the marked objects and therefore prematurely release the marked objects that were left out. This change will fix the issue by making sure we don't use the partially filled mark list in case we ran out of space.
Testing
Risk
Low, this change is merged to the main branch for a month now and nothing happened since.