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e1e43631f8
This is a deadlock that will also be fixed in the server by Bug #11844915 - HANG IN THDVAR MUTEX ACQUISITION. So this is a simple alternate method of fixing the same problem, but from within InnoDB. The simple change is to make rename table start a transaction before locking dict_sys->mutex since thd_supports_xa() can call THDVAR which can lock a mutex, LOCK_global_system_variables, that is used in the server by many other activities. At least one of those, sys_var::update(), can call back into InnoDB and try to lock dict_sys->mutex while holding LOCK_global_system_variables. The other bug fix for 11844915 eliminates the use of LOCK_global_system_variables for calls to THDVAR. Approved by marko in http://rb.no.oracle.com/rb/r/2000/ |
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