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  1. MariaDB Server
  2. MDEV-29512

WSREP: cluster conflict causes cluster deadlock

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      On a galera cluster with 3 nodes we have an even running the query below:

      2022-09-12  6:02:11 1 [Note] WSREP: cluster conflict due to high priority abort for threads:
      2022-09-12  6:02:11 1 [Note] WSREP: Winning thread: 
         THD: 1, mode: high priority, state: exec, conflict: executing, seqno: 76697477
         SQL: delete entry from entry inner join entry_file on entry_file.id=entry.file where entry_file.date_upload < now() -interval 366 day and  entry_file.date_upload > now() - interval 370 day and entry.id not in (select jm.entryid from entrymail_records jm) and entry.country_code <> 'BE'^V<AF>^^c^S^A
      2022-09-12  6:02:11 1 [Note] WSREP: Victim thread: 
         THD: 2401338, mode: local, state: exec, conflict: certifying, seqno: -1
         SQL: delete entry from entry inner join entry_file on entry_file.id=entry.file where entry_file.date_upload < now() -interval 366 day and  entry_file.date_upload > now() - interval 370 day and entry.id not in (select jm.entryid from entrymail_records jm) and entry.country_code <> 'BE'
      2022-09-12  6:02:11 1 [Note] WSREP: context: /home/buildbot/buildbot/build/mariadb-10.5.15/storage/innobase/handler/ha_innodb.cc:18802
      

      Now this caused a conflict, and WSREP aborted a thread.

      But this abort caused a deadlock on the node affecting all writes on the whole mariadb cluster.
      All writes on other nodes were hanging in a 'Commit' state.

      MariaDB also cannot be stopped correctly, only a kill -9 can stop the instance.
      I tried to stop the instance, and it failed, but after this I created a gdb coredump.

      Some relevant traces:

      Thread 5 (Thread 0x7f47f82db700 (LWP 78621)):
      #0  __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103
      #1  0x00007f480139a87a in __GI___pthread_mutex_lock (mutex=mutex@entry=0x7f44a0665340) at ../nptl/pthread_mutex_lock.c:135
      #2  0x000055c808b3ecc3 in inline_mysql_mutex_lock (src_line=591, src_file=0x55c809370458 "/home/buildbot/buildbot/build/mariadb-10.5.15/sql/sql_repl.cc", that=0x7f44a0665340) at ./include/mysql/psi/mysql_thread.h:752
      #3  log_in_use_callback (log_name=0x7f47f82d8890 "/var/lib/mysql/cust-db002-bin.000145", thd=0x7f44a06636a8) at ./sql/sql_repl.cc:591
      #4  THD_list_iterator::iterate<char const> (arg=<optimized out>, action=<optimized out>, this=<optimized out>) at ./sql/sql_class.h:1077
      #5  log_in_use (log_name=log_name@entry=0x7f47f82d8890 "/var/lib/mysql/cust-db002-bin.000145") at ./sql/sql_repl.cc:601
      #6  0x000055c808dfbfa7 in MYSQL_BIN_LOG::can_purge_log (this=0x55c809b76dc0 <mysql_bin_log>, log_file_name_arg=0x7f47f82d8890 "/var/lib/mysql/cust-db002-bin.000145") at ./sql/log.cc:5149
      #7  MYSQL_BIN_LOG::can_purge_log (this=0x55c809b76dc0 <mysql_bin_log>, log_file_name_arg=0x7f47f82d8890 "/var/lib/mysql/cust-db002-bin.000145") at ./sql/log.cc:5132
      #8  0x000055c808e04075 in MYSQL_BIN_LOG::purge_logs_before_date (this=0x55c809b76dc0 <mysql_bin_log>, purge_time=1662091333) at ./sql/log.cc:5075
      #9  0x000055c808e09774 in MYSQL_BIN_LOG::trx_group_commit_leader (this=this@entry=0x55c809b76dc0 <mysql_bin_log>, leader=leader@entry=0x7f47f82d8c00) at ./sql/log.cc:8486
      #10 0x000055c808e09a14 in MYSQL_BIN_LOG::write_transaction_to_binlog_events (this=0x55c809b76dc0 <mysql_bin_log>, entry=entry@entry=0x7f47f82d8c00) at ./sql/log.cc:8046
      #11 0x000055c808e09f07 in MYSQL_BIN_LOG::write_transaction_to_binlog (this=0x55c809b76dc0 <mysql_bin_log>, thd=<optimized out>, cache_mngr=0x7f479c030658, end_ev=<optimized out>, all=<optimized out>, using_stmt_cache=<optimized out>, using_trx_cache=true) at ./sql/log.cc:7641
      #12 0x000055c808e09ff7 in binlog_flush_cache (thd=thd@entry=0x7f479c000c18, cache_mngr=cache_mngr@entry=0x7f479c030658, end_ev=end_ev@entry=0x7f47f82d8d60, all=all@entry=true, using_stmt=using_stmt@entry=true, using_trx=using_trx@entry=true) at ./sql/log.cc:1780
      #13 0x000055c808e0b953 in binlog_commit_flush_xid_caches (xid=76697477, all=true, cache_mngr=0x7f479c030658, thd=0x7f479c000c18) at ./sql/log.cc:1928
      #14 MYSQL_BIN_LOG::log_and_order (this=<optimized out>, thd=0x7f479c000c18, xid=76697477, all=<optimized out>, need_prepare_ordered=<optimized out>, need_commit_ordered=<optimized out>) at ./sql/log.cc:10019
      #15 0x000055c808d23637 in ha_commit_trans (thd=thd@entry=0x7f479c000c18, all=all@entry=true) at ./sql/handler.cc:1789
      #16 0x000055c808c26611 in trans_commit (thd=thd@entry=0x7f479c000c18) at ./sql/transaction.cc:266
      #17 0x000055c808fb69f8 in Wsrep_high_priority_service::commit (this=0x7f47f82dacc0, ws_handle=..., ws_meta=...) at ./sql/wsrep_high_priority_service.cc:329
      #18 0x000055c80932fe66 in apply_write_set (server_state=..., high_priority_service=..., ws_handle=..., ws_meta=..., data=...) at ./wsrep-lib/src/server_state.cpp:332
      #19 0x000055c809330aed in wsrep::server_state::on_apply (this=<optimized out>, high_priority_service=..., ws_handle=..., ws_meta=..., data=...) at ./wsrep-lib/src/server_state.cpp:1114
      #20 0x000055c809344314 in wsrep::high_priority_service::apply (data=..., ws_meta=..., ws_handle=..., this=0x7f47f82dacc0) at ./wsrep-lib/include/wsrep/high_priority_service.hpp:47
      #21 (anonymous namespace)::apply_cb (ctx=0x7f47f82dacc0, wsh=<optimized out>, flags=<optimized out>, buf=<optimized out>, meta=<optimized out>, exit_loop=0x7f47f82d9f4f) at ./wsrep-lib/src/wsrep_provider_v26.cpp:507
      #22 0x00007f47f946698b in galera::TrxHandleSlave::apply (this=this@entry=0x7f431cbe7c70, recv_ctx=recv_ctx@entry=0x7f47f82dacc0, apply_cb=0x55c8093441e0 <(anonymous namespace)::apply_cb(void*, wsrep_ws_handle_t const*, uint32_t, wsrep_buf_t const*, wsrep_trx_meta_t const*, wsrep_bool_t*)>, meta=..., exit_loop=exit_loop@entry=@0x7f47f82d9f4f: false) at ./galera/src/trx_handle.cpp:396
      #23 0x00007f47f9478290 in galera::ReplicatorSMM::apply_trx (this=0x55c80c1e2790, recv_ctx=0x7f47f82dacc0, ts=...) at ./galera/src/replicator_smm.cpp:516
      #24 0x00007f47f947a351 in galera::ReplicatorSMM::process_trx (this=0x55c80c1e2790, recv_ctx=0x7f47f82dacc0, ts_ptr=...) at ./galera/src/replicator_smm.cpp:2136
      #25 0x00007f47f94a9d0b in galera::GcsActionSource::process_writeset (this=0x55c80c2dbf70, recv_ctx=0x7f47f82dacc0, act=..., exit_loop=@0x7f47f82da8cf: false) at ./galera/src/gcs_action_source.cpp:62
      #26 0x00007f47f94aa69a in galera::GcsActionSource::dispatch (this=0x55c80c2dbf70, recv_ctx=0x7f47f82dacc0, act=..., exit_loop=<optimized out>) at ./galera/src/gcs_action_source.cpp:110
      #27 0x00007f47f94ab1c1 in galera::GcsActionSource::process (this=0x55c80c2dbf70, recv_ctx=0x7f47f82dacc0, exit_loop=@0x7f47f82da8cf: false) at ./galera/src/gcs_action_source.cpp:186
      #28 0x00007f47f947b420 in galera::ReplicatorSMM::async_recv (this=0x55c80c1e2790, recv_ctx=0x7f47f82dacc0) at ./galera/src/replicator_smm.cpp:402
      #29 0x00007f47f945551b in galera_recv (gh=<optimized out>, recv_ctx=<optimized out>) at ./galera/src/wsrep_provider.cpp:263
      #30 0x000055c8093450ee in wsrep::wsrep_provider_v26::run_applier (this=<optimized out>, applier_ctx=<optimized out>) at ./wsrep-lib/src/wsrep_provider_v26.cpp:858
      #31 0x000055c808fd11c3 in wsrep_replication_process (thd=0x7f479c000c18, arg=<optimized out>) at ./wsrep-lib/include/wsrep/server_state.hpp:320
      #32 0x000055c808fc1f7f in start_wsrep_THD (arg=arg@entry=0x55c80c42a580) at ./sql/wsrep_mysqld.h:560
      #33 0x000055c808f4fa04 in pfs_spawn_thread (arg=0x55c80c415458) at ./storage/perfschema/pfs.cc:2201
      #34 0x00007f4801397fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
      #35 0x00007f4800fbaeff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      Lock seems to be owned by thread 99:

      (gdb) print *(pthread_mutex_t*)0x7f44a0665340
      $3 = {__data = {__lock = 2, __count = 0, __owner = 105061, __nusers = 1, __kind = 3, __spins = 0, __elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = "\002\000\000\000\000\000\000\000e\232\001\000\001\000\000\000\003", '\000' <repeats 22 times>, __align = 2}
      (gdb) thread find 105061
      Thread 99 has target id 'Thread 0x7f44c7687700 (LWP 105061)'
      

      Then a lot of threads in the following state:

      Thread 14 (Thread 0x7f4790f63700 (LWP 78879)):
      #0  futex_abstimed_wait (private=0, abstime=0x0, expected=3, futex_word=0x55c809b4216c <server_threads+44>) at ../sysdeps/unix/sysv/linux/futex-internal.h:172
      #1  __pthread_rwlock_wrlock_full (abstime=0x0, rwlock=0x55c809b42160 <server_threads+32>, rwlock@entry=0x20) at pthread_rwlock_common.c:706
      #2  __GI___pthread_rwlock_wrlock (rwlock=rwlock@entry=0x55c809b42160 <server_threads+32>) at pthread_rwlock_wrlock.c:27
      #3  0x000055c808a5a139 in inline_mysql_rwlock_wrlock (src_line=7501, src_file=0x55c80935a140 "/home/buildbot/buildbot/build/mariadb-10.5.15/sql/sql_class.h", that=0x55c809b42160 <server_threads+32>) at ./include/mysql/psi/mysql_thread.h:1008
      #4  THD_list::erase (thd=0x7f478c0113a8, this=0x55c809b42140 <server_threads>) at ./sql/sql_class.h:7501
      #5  unlink_thd (thd=0x7f478c0113a8) at ./sql/mysqld.cc:2578
      #6  0x000055c808c1757f in do_handle_one_connection (connect=<optimized out>, connect@entry=0x55c817dd3828, put_in_cache=put_in_cache@entry=true) at ./sql/sql_connect.cc:1429
      #7  0x000055c808c17c0d in handle_one_connection (arg=arg@entry=0x55c817dd3828) at ./sql/sql_connect.cc:1312
      #8  0x000055c808f4fa04 in pfs_spawn_thread (arg=0x55c817dddc68) at ./storage/perfschema/pfs.cc:2201
      #9  0x00007f4801397fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
      #10 0x00007f4800fbaeff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      And one galera thread that seems to hang:

      Thread 99 (Thread 0x7f44c7687700 (LWP 105061)):
      #0  futex_abstimed_wait_cancelable (private=0, abstime=0x7f44c7685490, expected=0, futex_word=0x7f44a17fb248) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
      #1  __pthread_cond_wait_common (abstime=0x7f44c7685490, mutex=0x55c80c1e3a38, cond=0x7f44a17fb220) at pthread_cond_wait.c:539
      #2  __pthread_cond_timedwait (cond=cond@entry=0x7f44a17fb220, mutex=mutex@entry=0x55c80c1e3a38, abstime=abstime@entry=0x7f44c7685490) at pthread_cond_wait.c:667
      #3  0x00007f47f9472346 in gu_cond_timedwait_SYS (ts=0x7f44c7685490, mutex=0x55c80c1e3a38, cond=<optimized out>) at ./galerautils/src/gu_threads.h:264
      #4  gu::Lock::wait (this=<synthetic pointer>, date=..., cond=...) at ./galerautils/src/gu_lock.hpp:64
      #5  galera::Monitor<galera::ReplicatorSMM::ApplyOrder>::wait (wait_until=..., gtid=..., this=0x55c80c1e3a38) at ./galera/src/monitor.hpp:399
      #6  galera::ReplicatorSMM::sync_wait (this=0x55c80c1e2790, upto=<optimized out>, tout=<optimized out>, gtid=0x0) at ./galera/src/replicator_smm.cpp:1603
      #7  0x00007f47f945557e in galera_sync_wait (wsrep=<optimized out>, upto=<optimized out>, tout=<optimized out>, gtid=<optimized out>) at ./galera/src/wsrep_provider.cpp:502
      #8  0x000055c80934560a in wsrep::wsrep_provider_v26::wait_for_gtid (this=<optimized out>, gtid=..., timeout=<optimized out>) at ./wsrep-lib/src/wsrep_provider_v26.cpp:1056
      #9  0x000055c808fd85a9 in Wsrep_server_service::set_position (this=<optimized out>, c=..., gtid=...) at ./wsrep-lib/include/wsrep/server_state.hpp:320
      #10 0x000055c809335d36 in wsrep::transaction::release_commit_order (this=0x7f44a0669958, lock=...) at ./wsrep-lib/include/wsrep/provider.hpp:143
      #11 0x000055c809340b4a in wsrep::transaction::after_statement (this=this@entry=0x7f44a0669958) at ./wsrep-lib/src/transaction.cpp:890
      #12 0x000055c809322c79 in wsrep::client_state::after_statement (this=this@entry=0x7f44a06698f0) at ./wsrep-lib/src/client_state.cpp:278
      #13 0x000055c808a885d9 in wsrep_after_statement (thd=<optimized out>) at ./sql/sql_class.h:5102
      #14 sp_head::execute (this=0x7f44a18757e0, thd=0x7f44a06636a8, merge_da_on_success=true) at ./sql/sp_head.cc:1476
      #15 0x000055c808a896a7 in sp_head::execute_procedure (this=this@entry=0x7f44a18757e0, thd=thd@entry=0x7f44a06636a8, args=args@entry=0x7f44c7686380) at ./sql/sp_head.cc:2449
      #16 0x000055c808bfcb82 in Event_job_data::execute (this=this@entry=0x7f44c7686b40, thd=thd@entry=0x7f44a06636a8, drop=<optimized out>) at ./sql/event_data_objects.cc:1485
      #17 0x000055c808e88d3d in Event_worker_thread::run (this=0x7f44c7686ddf, thd=0x7f44a06636a8, event=0x7f44a0fe8380) at ./sql/event_scheduler.cc:323
      #18 0x000055c808e88dca in event_worker_thread (arg=arg@entry=0x7f44a0fe8380) at ./sql/event_scheduler.cc:268
      #19 0x000055c808f4fa04 in pfs_spawn_thread (arg=0x7f44a0e31198) at ./storage/perfschema/pfs.cc:2201
      #20 0x00007f4801397fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
      #21 0x00007f4800fbaeff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      It seems very similar to MDEV-25368, but that should already have been fixed in 10.5.15?

      Corefile & libs have been uploaded to the MariaDB FTP!
      This is a debian 10 system with MariaDB 1:10.5.15+maria~buster installed.

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              Assignee:
              seppo Seppo Jaakola
              Reporter:
              dupondje Jean-Louis Dupond
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                Updated:
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