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  1. MariaDB Server
  2. MDEV-10768

Galera segfault on transaction abort after failed wsrep_grant_mdl_exception()

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 10.1.14
    • Fix Version/s: 10.1.18
    • Component/s: Galera
    • Labels:
      None

      Description

      A galera node crashed with a segmentation fault in `ha_abort_transaction()` calling a unknown pthread library function.

      The backtrace looks similar to MDEV-9416 but the originating statement here was an `ALTER TABLE`, most likely the addition of another partition to a partitioned table.

      The weird part is that the actual crash happens in libpthread, I don't see anything in ha_abort_transaction() calling any pthread functions. With the exception of the DBUG_ macros, but as this happened with a non-debug production binary these should not be compiled in, right?

      160831 20:50:13 [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: 10.1.14-MariaDB
      key_buffer_size=1073741824
      read_buffer_size=131072
      max_used_connections=401
      max_threads=1002
      thread_count=438
      It is possible that mysqld could use up to 
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 3249432 K  bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
       
      Thread pointer: 0x0x7f67b9412008
      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 = 0x7f679b035d40 thread_stack 0x48400
      (my_addr_resolve failure: fork)
      /usr/sbin/mysqld(my_print_stacktrace+0x2b) [0x7f96ebc9797b]
      /usr/sbin/mysqld(handle_fatal_signal+0x475) [0x7f96eb7f6825]
      /lib64/libpthread.so.0(+0x3062a0f710) [0x7f96eadfc710]
      /usr/sbin/mysqld(ha_abort_transaction(THD*, THD*, char)+0xa7) [0x7f96eb800807]
      /usr/sbin/mysqld(wsrep_abort_thd(void*, void*, char)+0x154) [0x7f96eb7a7b54]
      /usr/sbin/mysqld(wsrep_grant_mdl_exception(MDL_context*, MDL_ticket*, MDL_key const*)+0x1c9) [0x7f96eb799669]
      /usr/sbin/mysqld(MDL_lock::can_grant_lock(enum_mdl_type, MDL_context*, bool) const+0x11f) [0x7f96eb752dbf]
      /usr/sbin/mysqld(MDL_context::try_acquire_lock_impl(MDL_request*, MDL_ticket**)+0xf5) [0x7f96eb753995]
      /usr/sbin/mysqld(MDL_context::acquire_lock(MDL_request*, double)+0x30) [0x7f96eb753e40]
      /usr/sbin/mysqld(MDL_context::upgrade_shared_lock(MDL_ticket*, enum_mdl_type, double)+0xb8) [0x7f96eb7547e8]
      /usr/sbin/mysqld(mysql_alter_table(THD*, char*, char*, HA_CREATE_INFO*, TABLE_LIST*, Alter_info*, unsigned int, st_order*, bool)+0x2081) [0x7f96eb70c7d1]
      /usr/sbin/mysqld(Sql_cmd_alter_table::execute(THD*)+0x5d7) [0x7f96eb74e817]
      /usr/sbin/mysqld(mysql_execute_command(THD*)+0x140f) [0x7f96eb684a4f]
      /usr/sbin/mysqld(mysql_parse(THD*, char*, unsigned int, Parser_state*)+0x28d) [0x7f96eb68c8fd]
      /usr/sbin/mysqld(Query_log_event::do_apply_event(rpl_group_info*, char const*, unsigned int)+0x1208) [0x7f96eb8bdea8]
      /usr/sbin/mysqld(wsrep_apply_cb(void*, void const*, unsigned long, unsigned int, wsrep_trx_meta const*)+0x36a) [0x7f96eb7a509a]
      /usr/lib64/galera/libgalera_smm.so(galera::TrxHandle::apply(void*, wsrep_cb_status (*)(void*, void const*, unsigned long, unsigned int, wsrep_trx_meta const*), wsrep_trx_meta const&) const+0xd3) [0x7f96e5d10063]
      /usr/lib64/galera/libgalera_smm.so(+0x21d1c3) [0x7f96e5d471c3]
      /usr/lib64/galera/libgalera_smm.so(galera::ReplicatorSMM::apply_trx(void*, galera::TrxHandle*)+0xa4) [0x7f96e5d49074]
      /usr/lib64/galera/libgalera_smm.so(galera::ReplicatorSMM::process_trx(void*, galera::TrxHandle*)+0x40) [0x7f96e5d4a090]
      /usr/lib64/galera/libgalera_smm.so(galera::GcsActionSource::dispatch(void*, gcs_action const&, bool&)+0x3f3) [0x7f96e5d2adf3]
      /usr/lib64/galera/libgalera_smm.so(galera::GcsActionSource::process(void*, bool&)+0x5b) [0x7f96e5d2c1bb]
      /usr/lib64/galera/libgalera_smm.so(galera::ReplicatorSMM::async_recv(void*)+0x6d) [0x7f96e5d4be5d]
      /usr/lib64/galera/libgalera_smm.so(galera_recv+0x23) [0x7f96e5d5cc23]
      /usr/sbin/mysqld(+0x57a172) [0x7f96eb7a6172]
      /usr/sbin/mysqld(start_wsrep_THD+0x403) [0x7f96eb797733]
      /lib64/libpthread.so.0(+0x3062a079d1) [0x7f96eadf49d1]
      /lib64/libc.so.6(clone+0x6d) [0x7f96e92da9dd]
       
      Trying to get some variables.
      Some pointers may be invalid and cause the dump to abort.
      Query (0x7f67b9464715): is an invalid pointer
      Connection ID (thread ID): 8
      Status: NOT_KILLED
       
      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=on,exists_to_in=on
       
      The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
      information that should help you find out what is causing the crash.
      

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              Assignee:
              nirbhay_c Nirbhay Choubey (Inactive)
              Reporter:
              hholzgra Hartmut Holzgraefe
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                Created:
                Updated:
                Resolved: