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  1. MariaDB Server
  2. MDEV-5037

Server crash on a JOIN on a derived table with join_cache_level > 2



    • Bug
    • Status: Closed (View Workflow)
    • Critical
    • Resolution: Fixed
    • 5.5.32, 5.5.33
    • 5.5.34
    • None
    • Debian Squeeze amd64 5.5.32 & Debian Squeeze amd64 5.5.33
      (packaged versions)


      While the join_cache_level variable is set to a value > 2, a query with a join on a derived table with a TEXT column in it could result to a server crash when LIMIT x OFFSET x is used on the derived table.

      To reproduce the crash, import the attached SQL then execute the following query :

      EXPLAIN SELECT 1 FROM (SELECT url, id FROM t2 LIMIT 1 OFFSET 20) derived RIGHT JOIN t1 ON t1.id = derived.id;

      Here is the error log output :

      mysqld: 130919 14:11:26 [ERROR] mysqld got signal 11 ;
      mysqld: This could be because you hit a bug. It is also possible that this binary
      mysqld: or one of the libraries it was linked against is corrupt, improperly built,
      mysqld: or misconfigured. This error can also be caused by malfunctioning hardware.
      mysqld: To report this bug, see http://kb.askmonty.org/en/reporting-bugs
      mysqld: We will try our best to scrape up some info that will hopefully help
      mysqld: diagnose the problem, but since we have already crashed, 
      mysqld: something is definitely wrong and this may fail.
      mysqld: Server version: 5.5.33-MariaDB-1~squeeze
      mysqld: key_buffer_size=2147483648
      mysqld: read_buffer_size=2097152
      mysqld: max_used_connections=1
      mysqld: max_threads=252
      mysqld: thread_count=1
      mysqld: It is possible that mysqld could use up to 
      mysqld: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 3133826 K  bytes of memory
      mysqld: Hope that's ok; if not, decrease some variables in the equation.
      mysqld: Thread pointer: 0x0x7fb69bcfb5f0
      mysqld: Attempting backtrace. You can use the following information to find out
      mysqld: where mysqld died. If you see no messages after this, something went
      mysqld: terribly wrong...
      mysqld: stack_bottom = 0x7fb37714ae58 thread_stack 0x48000
      mysqld: /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x7fb69035d80e]
      mysqld: /usr/sbin/mysqld(handle_fatal_signal+0x4ac)[0x7fb68ff5cd7c]
      mysqld: /lib/libpthread.so.0(+0xeff0)[0x7fb68f659ff0]
      mysqld: /usr/sbin/mysqld(_ZN10DsMrr_impl15choose_mrr_implEjyPjS0_P9COST_VECT+0x54)[0x7fb68feff724]
      mysqld: /usr/sbin/mysqld(_ZN10DsMrr_impl10dsmrr_infoEjjjjPjS0_P9COST_VECT+0xe3)[0x7fb68feffad3]
      mysqld: /usr/sbin/mysqld(_Z33check_join_cache_usage_for_tablesP4JOINyj+0x694)[0x7fb68fe40ed4]
      mysqld: /usr/sbin/mysqld(_ZN4JOIN8optimizeEv+0x16c7)[0x7fb68fe4f477]
      mysqld: /usr/sbin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0xd2)[0x7fb68fe568e2]
      mysqld: /usr/sbin/mysqld(_Z19mysql_explain_unionP3THDP18st_select_lex_unitP13select_result+0x10c)[0x7fb68fe5726c]
      mysqld: /usr/sbin/mysqld(+0x37771f)[0x7fb68fdfe71f]
      mysqld: /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x35f9)[0x7fb68fe05539]
      mysqld: /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x1cc)[0x7fb68fe080ec]
      mysqld: /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1792)[0x7fb68fe09892]
      mysqld: /usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x419)[0x7fb68fece809]
      mysqld: /usr/sbin/mysqld(handle_one_connection+0x51)[0x7fb68fece8c1]
      mysqld: /lib/libpthread.so.0(+0x68ca)[0x7fb68f6518ca]
      mysqld: /lib/libc.so.6(clone+0x6d)[0x7fb68dfd0b6d]
      mysqld: Trying to get some variables.
      mysqld: Some pointers may be invalid and cause the dump to abort.
      mysqld: Query (0x7fb69bd467f8): EXPLAIN SELECT 1 FROM (SELECT url, id FROM t2 LIMIT 1 OFFSET 20) derived RIGHT JOIN t1 ON t1.id = derived.id
      mysqld: Connection ID (thread ID): 1
      mysqld: Status: NOT_KILLED
      mysqld: Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
      mysqld: The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
      mysqld: information that should help you find out what is causing the crash.
      mysqld_safe: Number of processes running now: 0
      mysqld_safe: mysqld restarted




            psergei Sergei Petrunia
            jb-boin Jean Weisbuch
            0 Vote for this issue
            3 Start watching this issue



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