[release/8.0] [mono][metadata] Replace use of mem manager lock with loader lock #91327
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Hash table operations under the mem manager lock could end up taking the loader lock when performing type comparison, in the case where custom modifiers needed to be loaded. Use the loader lock instead to prevent deadlocks.
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Aug 30, 2023
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Backport of #91190 to release/8.0
/cc @BrzVlad
Customer Impact
The mono runtime may deadlock when certain custom attribute types are loaded for the first time by the execution engine.
Testing
Existing automated tests
Risk
Low. We switched to a higher-level lock. There may be some startup perf regression in highly parallel scenarios.
IMPORTANT: If this backport is for a servicing release, please verify that:
The PR target branch is
release/X.0-staging, notrelease/X.0.If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.