[release/9.0] [mono][sgen] Add separate card mark function to be used with debug #110262
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When marking cards for a non-array object or a an element vt in an object, it is enough to mark a card for any address within that object/vt because they are always fully scanned. Cardtable consistency checks are not accounting for this detail and it is difficult to have it implemented. Instead, when having such debug flags enabled, we use an explicit approach where every single card is being marked.
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Backport of #109698 to release/9.0
/cc @BrzVlad
Customer Impact
There are existing GC related crashes in the wild, that are currently impossible to investigate. A debug option that might assist this is
MONO_GC_DEBUG=check-remset-consistency, however a customer reported that this option reports false positives. This PR fixes these false positives, hopefully assisting in the investigation of GC crashes.Regression
No.
Testing
Manual testing locally.
Risk
Low. This change has no impact unless a certain debug flag is passed, flag which is used for the sole purpose of tracking down GC crashes.
IMPORTANT: If this backport is for a servicing release, please verify that:
release/X.0-staging, notrelease/X.0.Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.
Keep in mind that we still need package authoring in .NET 8 and older versions.