[release/7.0-staging] Caching settings.pause_mode to avoid deadlock #84738
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Tagging subscribers to this area: @dotnet/gc Issue DetailsBackport of #84189 to release/7.0-staging /cc @cshung Customer ImpactTestingRiskIMPORTANT: If this backport is for a servicing release, please verify that:
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Backport of #84189 to release/7.0-staging
/cc @cshung
Customer Impact
Processes may deadlock if they are using NoGCRegion. This is reported as #84096. This explained the root cause and the fix. Since it is a race between a GC completing and stopping a NoGCRegion, any NoGCRegion user could have hit this by chance.
Testing
This change was merged into the main branch 3 weeks ago and hit no issues associated with that, and it has gone through the regular GC testing as reported here. Running the NoGCRegion CI test under Server GC routinely reproduces the deadlock and I verified that the deadlock is gone with this fix.
Risk
The change only caches a flag, it is unlikely to cause any regression.
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.