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  1. MariaDB Server
  2. MDEV-26249

Crash in in Explain_node::print_explain_for_children while writing to the slow query log

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    Details

    • Type: Bug
    • Status: Confirmed (View Workflow)
    • Priority: Critical
    • Resolution: Unresolved
    • Affects Version/s: 10.3, 10.3.22, 10.4, 10.5, 10.6
    • Fix Version/s: 10.3, 10.4, 10.5, 10.6
    • Component/s: Optimizer
    • Labels:
      None

      Description

      The following crash happens:

      210721 1:33:14 [ERROR] mysqld got signal 11 ;
      This could be because you hit a bug. It is also possible that this binary
      or one of the libraries it was linked against is corrupt, improperly built,
      or misconfigured. This error can also be caused by malfunctioning hardware.
       
      To report this bug, see https://mariadb.com/kb/en/reporting-bugs
       
      We will try our best to scrape up some info that will hopefully help
      diagnose the problem, but since we have already crashed,
      something is definitely wrong and this may fail.
       
      Server version: 10.3.22-MariaDB-log
      key_buffer_size=33554432
      read_buffer_size=2097152
      max_used_connections=205
      max_threads=65546
      thread_count=28
      It is possible that mysqld could use up to
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 402770140 K bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
       
      Thread pointer: 0x7f7d1cb5d4e8
      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 = 0x7f86307edd58 thread_stack 0x49000
      mysys/stacktrace.c:270(my_print_stacktrace)[0x7f865dddcc5b]
      sql/signal_handler.cc:209(handle_fatal_signal)[0x7f865d880387]
      /lib64/libpthread.so.0(+0x3de160f7e0)[0x7f865cc5e7e0]
      sql/sql_explain.cc:640(Explain_node::print_explain_for_children(Explain_query*, select_result_sink*, unsigned char, bool))[0x7f865d7aac1c]
      sql/sql_explain.cc:825(Explain_select::print_explain(Explain_query*, select_result_sink*, unsigned char, bool))[0x7f865d7afea6]
      sql/sql_explain.cc:262(Explain_query::print_explain_str(THD*, String*, bool))[0x7f865d7aa9fe]
      sql/log.cc:3075(MYSQL_QUERY_LOG::write(THD*, long, char const*, unsigned long, unsigned long long, unsigned long long, bool, char const*, unsigned long))[0x7f865d93e897]
      sql/log.cc:1086(Log_to_file_event_handler::log_slow(THD*, my_hrtime_t, char const*, unsigned long, unsigned long long, unsigned long long, bool, char const*, unsigned long))[0x7f865d93ec80]
      sql/log.cc:1358(LOGGER::slow_log_print(THD*, char const*, unsigned long, unsigned long long))[0x7f865d9399bd]
      sql/sql_parse.cc:2559(log_slow_statement(THD*))[0x7f865d6b638f]
      sql/sql_class.h:1825(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool))[0x7f865d6c3de2]
      sql/sql_parse.cc:1404(do_command(THD*))[0x7f865d6c560e]
      sql/threadpool_common.cc:359(threadpool_process_request)[0x7f865d7c97c8]
      sql/threadpool_generic.cc:1601(worker_main)[0x7f865d856438]
      perfschema/pfs.cc:1872(pfs_spawn_thread)[0x7f865d9f90bd]
      /lib64/libpthread.so.0(+0x3de1607aa1)[0x7f865cc56aa1]
      /lib64/libc.so.6(clone+0x6d)[0x7f865bbd5aad]
       
      Trying to get some variables.
      Some pointers may be invalid and cause the dump to abort.
      Query (0x7f7d1cb45a50): SELECT * FROM ( SELECT ...  FROM t WHERE ... GROUP BY c1, c2 ) tmp WHERE 1=0 
      

      EXPLAIN for the same SELECT does not give a crash. The table t is a partitioned InnoDB table, not a view, no union involved. So, this may be different from MDEV-23160

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            Assignee:
            psergei Sergei Petrunia
            Reporter:
            valerii Valerii Kravchuk
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              Dates

              Created:
              Updated:

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