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  1. MariaDB Server
  2. MDEV-35197

Wrong locking order of LOCK_log and LOCK_global_system_variables, potential deadlock of server

Details

    Description

      Looks related to MDEV-29744, though is substantially different (different testcase, different versions affected, looks to be a new regression and the mutex order is reversed)

      # mysqld options required for replay: --log_bin
      		 
      SET GLOBAL binlog_checksum=0;
      		 
      INSTALL SONAME 'ha_spider';
      		 
      RESET MASTER;

      Leads to:

      CS 11.7.0 4016c905cbabea7f29ed282dc2125254c7c0d419 (Debug)

      		 
      Version: '11.7.0-MariaDB-debug-log'  socket: '/test/MD141024-mariadb-11.7.0-linux-x86_64-dbg/socket.sock'  port: 12847  MariaDB Server
      		 
      safe_mutex: Found wrong usage of mutex 'LOCK_log' and 'LOCK_global_system_variables'
      		 
      Mutex currently locked (in reverse order):
      		 
      LOCK_global_system_variables      /test/11.7_dbg/sql/sql_plugin.cc  line 3132
      		 
      LOCK_log                          /test/11.7_dbg/sql/log.cc  line 4449

      MTR Testcase:

      --source include/have_log_bin.inc
      		 
      SET GLOBAL binlog_checksum=0;
      		 
      INSTALL SONAME 'ha_spider';
      		 
      RESET MASTER;

      Found present in 11.4-11.7, though may have been introduced in 11.3. Not present in 11.2.

      Attachments

        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29744 safe_mutex: Found wrong usage of mutex 'LOCK_commit_ordered' and 'LOCK_global_system_variables', or of mutex 'LOCK_global_system_variables' and 'LOCK_log', on setting max_binlog_size or binlog_checksum and START TRANSACTION

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          is caused by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-25611 RESET MASTER still causes the server to hang

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29744 safe_mutex: Found wrong usage of mutex 'LOCK_commit_ordered' and 'LOCK_global_system_variables', or of mutex 'LOCK_global_system_variables' and 'LOCK_log', on setting max_binlog_size or binlog_checksum and START TRANSACTION

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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            People

              knielsen Kristian Nielsen
              Roel Roel Van de Paar
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              Dates

                Created:
                Updated:
                Resolved:

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