[Merged by Bors] - sync2: fix Advance race #6588
Closed
+51
−2
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Motivation
OrderedSet.Advance is not threadsafe, but it's invoked on timer w/o any locking.
Description
SetSyncBase already has a mutex which it's using for advancing so let's use it when advancing the OrderedSet on timer, too.
Test Plan
Existing tests must pass.