[release/7.0] Move taking of lock earlier to avoid race in PruneCallback #30098
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This is a port of #30080
Fixes #29952
Description
The field
_idlePoolGroups
was being used outside the lock.Customer impact
ArgumentOutOfRangeException
exceptions when using Microsoft.Data.Sqlite, even without connection pooling.How found
Multiple customer reports on 7.0.
Regression
No.
Testing
Manual testing.
Risk
Low; simple move of the lock area, and a quirk was added to revert back to older behavior.