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lp:~sergei.glushchenko/percona-server/5.6-ps-bug1191375

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

Bug 1191375: Percona Server 5.6 RC with thread pool crashes under load
Attached gdb stack trace points that SIGSEGV is emitted in pfs_spawn_thread,
when newly created thread tries to initialize some of it's instrumentation
properties by copying them prom parent's thread instrumentation properties.
This likely caused by the fact that parent thread finished shortly after
it spawned child thread and before child thread accessed parent's properties.
This patch fixes race by copying all needed properties from parent's
structures to the argument structure for child thread before the child
thread is spawned. This makes child thread initialization immune to parent's
thread death.

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