MySQL patches by Codership

wsrep_rollback_process() does not restore THD globals after rollback

Bug #1082430 reported by Teemu Ollakka
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MySQL patches by Codership
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5.5
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Bug Description

wsrep_rollback_process() calls THD::store_globals() before doing rollback but does not restore original thread context after rolling back. This may cause wsrep_close_thread() to signal wrong thread since THD::mysys_var points to rollbacker thread context.

Possibly related: https://bugs.launchpad.net/codership-mysql/+bug/974093

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