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MDEV-29869 mtr failure: innodb.deadlock_wait_thr_race
1. The merge aeccbbd has overwritten lock0lock.cc, and the changes of MDEV-29622 and MDEV-29635 were partially lost, this commit restores the changes. 2. innodb.deadlock_wait_thr_race test: The following hang was found during testing. There is deadlock_report_before_lock_releasing sync point in Deadlock::report(), which is waiting for sel_cont signal under lock_sys_t lock. The signal must be issued after "UPDATE t SET b = 100" rollback, and that rollback is executing undo record, which is blocked on dict_sys latch request. dict_sys is locked by the thread of statistics update(dict_stats_save()), and during that update lock_sys lock is requested, and can't be acquired as Deadlock::report() holds it. We have to disable statistics update to make the test stable. But even if statistics update is disabled, and transaction with consistent snapshot is started at the very beginning of the test to prevent purging, the purge can still be invoked for system tables, and it tries to open system table by id, what causes dict_sys.freeze() call and dict_sys latching. What, in combination with lock_sys::xx_lock() causes the same deadlock as described above. We need to disable purging globally for the test as well. All the above is applicable to innodb.deadlock_wait_lock_race test also.
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Original file line number | Diff line number | Diff line change |
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--innodb-force-recovery=2 |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1 @@ | ||
--innodb-force-recovery=2 |
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