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  1. MariaDB Server
  2. MDEV-20323

MariaDB asserts in srv_error_monitor_thread at srv0srv.cc:2410

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      The 10.1 branch has been stable for us for a while now.
      10.2 crashes for us on a regular basis, so upgrading is not an option. (See MDEV-16923, and others)

      Unfortunately, 10.1.40 crashed for us with an update on JOINs.
      So we upgraded to 10.1.41, but since we did that the server crashes multiple times a day with the following log message:

      Server version: 10.1.41-MariaDB-1~bionic
      key_buffer_size=134217728
      read_buffer_size=131072
      max_used_connections=192
      max_threads=502
      thread_count=45
      It is possible that mysqld could use up to 
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1233831 K  bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
       
      Thread pointer: 0x7fa04ec10008
      Attempting backtrace. You can use the following information to find out
      where mysqld died. If you see no messages after this, something went
      terribly wrong...
      stack_bottom = 0x7f9f52fb3d68 thread_stack 0x49000
      *** buffer overflow detected ***: /usr/sbin/mysqld terminated
      Fatal signal 6 while backtracing
      

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            marko Marko Mäkelä
            CrewOne Sander Pilon
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