Created by Sergei Glushchenko and last modified
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596. By Sergei Glushchenko

Bug 1309026: server crashing, potentially thread pool related
Cause is race condition in group commit code which leads to
concurrent updates in PFS instrumentation while it is not designed
to be updated concurrently. Workaround is to set thread-local
value of PSI_thread to NULL for the follower thread while it is
waiting for leader thread to complete commit.

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