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mirror/mariadb

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Bug #38694 Race condition in replication thread shutdown The issue of the current bug is unguarded access to mi->slave_running by the shutdown thread calling end_slave() that is bug#29968 (alas happened not to be cross-linked with the current bug) Fixed: with removing the unguarded read of the running status and perform reading it in terminate_slave_thread() at time run_lock is taken (mostly bug#29968 backporting, still with some improvements over that patch - see the error reporting from terminate_slave_thread()). Issue of bug#38716 is fixed here for 5.0 branch as well. Note: There has been a separate artifact identified - a race condition between init_slave() and end_slave() - reported as Bug#44467. mysql-test/r/rpl_bug38694.result: a new results file is added. mysql-test/t/rpl_bug38694-slave.opt: simulating delay at slave threads shutdown. mysql-test/t/rpl_bug38694.test: A new test to check if a delay at the termination phase of slave threads could cause any issue. sql/slave.cc: The unguarded read of the running status is removed. Its reading is done in terminate_slave_thread() at time run_lock is taken; Calling terminate_slave_threads(skip_lock := !need_slave_mutex) in the failing branch of start_slave_threads() which is bug#38716 issue. sql/slave.h: removing terminate_slave_thread() out of the global interface scope.

2009-04-28 14:46:07 +03:00

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