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  1. MariaDB Server
  2. MDEV-16005

galera suite MTR tests MW-328B and MW-328C sporadic failures

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      Description

      MariaDB versions 10.1 and 10.2 show sporadic failures with mtr galera suite tests MW- 328B and 328C. Failure is about excessive warnings found in error log after test execution, like here:

      galera.MW-328B 'xtradb'                  [ fail ]  Found warnings/errors in server log file!
              Test ended at 2018-04-24 12:27:59
      line
      safe_mutex: Found wrong usage of mutex 'LOCK_wsrep_thd' and 'LOCK_thd_data'
      ^ Found warnings in /home/seppo/work/wsrep/mariadb-server/mysql-test/var/log/mysqld.2.err
      

      In 10.3, similar warnings happen, but the deadlocking mutexes are: LOCK_thd_kill and LOCK_wsrep_thd

      How to Reproduce:
      1. Prepare debug build of 10.1, 10.2 or 10.3 version
      2. start mtr test, e.g. like here:
      ./mtr galera.MW-328B --repeat=100

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              Assignee:
              seppo Seppo Jaakola
              Reporter:
              seppo Seppo Jaakola
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