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  1. MariaDB Server
  2. MDEV-24876

InnoDB: Failing assertion: lock->lock_word == X_LOCK_DECR or safe_mutex: Trying to destroy a mutex cache->lock that was locked

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      Description

      The test case is non-deterministic, run with --repeat=N. It currently fails fairly well for me, within 10 attempts or less.
      The test case is for reproducing purposes only. I hope it could be turned into a deterministic synchronized one when the problem is clear.

      --source include/have_innodb.inc
      --source include/have_sequence.inc
       
      call mtr.add_suppression("has or is referenced in foreign key constraints");
      SET @stats= @@innodb_stats_persistent;
      SET GLOBAL innodb_stats_persistent= ON;
       
      CREATE TABLE t1 (pk INT PRIMARY KEY, a INT, KEY (a)) ENGINE=InnoDB;
      INSERT INTO t1 (pk) SELECT seq FROM seq_1_to_100;
       
      CREATE TABLE t2 (
        pk INT PRIMARY KEY,
        b INT,
        c VARCHAR(8),
        KEY (b),
        FULLTEXT KEY (c),
        FOREIGN KEY (pk) REFERENCES t1 (pk),
        FOREIGN KEY (b) REFERENCES t1 (a)
      ) ENGINE=InnoDB;
       
      FLUSH TABLES;
       
      --connect (con1,localhost,root,,test)
      SET FOREIGN_KEY_CHECKS= OFF;
      ALTER TABLE t2 DROP KEY b;
      SET FOREIGN_KEY_CHECKS= ON;
      --send
        ALTER TABLE t2 FORCE, ALGORITHM=COPY;
       
      --connection default
      --let $run= 20
      while ($run)
      {
        DELETE FROM t1 ORDER BY a LIMIT 5;
        --dec $run
      }
       
      # Cleanup
      --connection con1
      --error ER_ERROR_ON_RENAME
      --reap
      --disconnect con1
      --connection default
      DROP TABLE t2, t1;
      SET GLOBAL innodb_stats_persistent= @stats;
      

      Assertion failure on 10.2-10.5 (scroll the code block for the 2nd conflicting thread):

      10.2 da3211e4

      2021-02-15 21:55:50 140664529213184 [ERROR] InnoDB: In ALTER TABLE `test`.`t2` has or is referenced in foreign key constraints which are not compatible with the new table definition.
      2021-02-15 21:55:50 140664529213184 [Note] InnoDB: Deferring DROP TABLE `test`.`FTS_0000000000000020_CONFIG`; renaming to test/#sql-ib35
      2021-02-15 21:55:50 0x7fef034bd700  InnoDB: Assertion failure in file /data/src/10.2/storage/innobase/sync/sync0rw.cc line 259
      InnoDB: Failing assertion: lock->lock_word == X_LOCK_DECR
       
      #6  0x000055e2dcc5d75c in ut_dbg_assertion_failed (expr=0x55e2dd1f7c30 "lock->lock_word == X_LOCK_DECR", file=0x55e2dd1f7b30 "/data/src/10.2/storage/innobase/sync/sync0rw.cc", line=259) at /data/src/10.2/storage/innobase/ut/ut0dbg.cc:60
      #7  0x000055e2dcc09f61 in rw_lock_free_func (lock=0x7feeb40332c0) at /data/src/10.2/storage/innobase/sync/sync0rw.cc:259
      #8  0x000055e2dcd734a3 in pfs_rw_lock_free_func (lock=0x7feeb40332c0) at /data/src/10.2/storage/innobase/include/sync0rw.ic:603
      #9  0x000055e2dcd77092 in fts_cache_destroy (cache=0x7feeb40332c0) at /data/src/10.2/storage/innobase/fts/fts0fts.cc:287
      #10 0x000055e2dcd8197f in fts_t::~fts_t (this=0x7feeb4037180, __in_chrg=<optimized out>) at /data/src/10.2/storage/innobase/fts/fts0fts.cc:5383
      #11 0x000055e2dcd81a57 in fts_free (table=0x7feeb4032730) at /data/src/10.2/storage/innobase/fts/fts0fts.cc:5420
      #12 0x000055e2dcb96468 in row_drop_ancillary_fts_tables (table=0x7feeb4032730, trx=0x7fef08123330) at /data/src/10.2/storage/innobase/row/row0mysql.cc:3197
      #13 0x000055e2dcb97897 in row_drop_table_for_mysql (name=0x7fef034b84d0 "test/#sql-f2425_a", trx=0x7fef08123330, sqlcom=SQLCOM_ALTER_TABLE, create_failed=false, nonatomic=true) at /data/src/10.2/storage/innobase/row/row0mysql.cc:3707
      #14 0x000055e2dca71ec7 in ha_innobase::delete_table (this=0x7feeb4015f80, name=0x7fef034b9cc0 "./test/#sql-f2425_a", sqlcom=SQLCOM_ALTER_TABLE) at /data/src/10.2/storage/innobase/handler/ha_innodb.cc:13317
      #15 0x000055e2dca5bfac in ha_innobase::delete_table (this=0x7feeb4015f80, name=0x7fef034b9cc0 "./test/#sql-f2425_a") at /data/src/10.2/storage/innobase/handler/ha_innodb.cc:13442
      #16 0x000055e2dc84fc70 in handler::ha_delete_table (this=0x7feeb4015f80, name=0x7fef034b9cc0 "./test/#sql-f2425_a") at /data/src/10.2/sql/handler.cc:4481
      #17 0x000055e2dc84a1ed in ha_delete_table (thd=0x7feeb4000d90, table_type=0x55e2de690380, path=0x7fef034b9cc0 "./test/#sql-f2425_a", db=0x7feeb4013c00 "test", alias=0x7fef034ba6b0 "#sql-f2425_a", generate_warning=false) at /data/src/10.2/sql/handler.cc:2443
      #18 0x000055e2dc68ac51 in quick_rm_table (thd=0x7feeb4000d90, base=0x55e2de690380, db=0x7feeb4013c00 "test", table_name=0x7fef034ba6b0 "#sql-f2425_a", flags=3, table_path=0x0) at /data/src/10.2/sql/sql_table.cc:2734
      #19 0x000055e2dc69e202 in mysql_alter_table (thd=0x7feeb4000d90, new_db=0x7feeb4013c00 "test", new_name=0x0, create_info=0x7fef034bb290, table_list=0x7feeb40135e8, alter_info=0x7fef034bb1e0, order_num=0, order=0x0, ignore=false) at /data/src/10.2/sql/sql_table.cc:9847
      #20 0x000055e2dc71bec4 in Sql_cmd_alter_table::execute (this=0x7feeb4013c10, thd=0x7feeb4000d90) at /data/src/10.2/sql/sql_alter.cc:333
      #21 0x000055e2dc5ca079 in mysql_execute_command (thd=0x7feeb4000d90) at /data/src/10.2/sql/sql_parse.cc:5994
      #22 0x000055e2dc5cf091 in mysql_parse (thd=0x7feeb4000d90, rawbuf=0x7feeb40134f8 "ALTER TABLE t2 FORCE, ALGORITHM=COPY", length=36, parser_state=0x7fef034bc5f0, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:7763
      #23 0x000055e2dc5bd36a in dispatch_command (command=COM_QUERY, thd=0x7feeb4000d90, packet=0x7feeb4008b51 "", packet_length=36, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:1827
      #24 0x000055e2dc5bbe65 in do_command (thd=0x7feeb4000d90) at /data/src/10.2/sql/sql_parse.cc:1381
      #25 0x000055e2dc7168ba in do_handle_one_connection (connect=0x55e2dec36b20) at /data/src/10.2/sql/sql_connect.cc:1336
      #26 0x000055e2dc71661f in handle_one_connection (arg=0x55e2dec36b20) at /data/src/10.2/sql/sql_connect.cc:1241
      #27 0x000055e2dcf3ed22 in pfs_spawn_thread (arg=0x55e2dec36df0) at /data/src/10.2/storage/perfschema/pfs.cc:1869
      #28 0x00007fef0d5f8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #29 0x00007fef0d1d4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
       
      Thread 27 (Thread 0x7fef03508700 (LWP 992322)):
      #0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55e2de879ff8) at ../sysdeps/nptl/futex-internal.h:183
      #1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55e2de879fa8, cond=0x55e2de879fd0) at pthread_cond_wait.c:508
      #2  __pthread_cond_wait (cond=0x55e2de879fd0, mutex=0x55e2de879fa8) at pthread_cond_wait.c:638
      #3  0x000055e2dcb12d5c in os_event::wait (this=0x55e2de879f90) at /data/src/10.2/storage/innobase/os/os0event.cc:158
      #4  0x000055e2dcb1280c in os_event::wait_low (this=0x55e2de879f90, reset_sig_count=7) at /data/src/10.2/storage/innobase/os/os0event.cc:325
      #5  0x000055e2dcb12b26 in os_event_wait_low (event=0x55e2de879f90, reset_sig_count=7) at /data/src/10.2/storage/innobase/os/os0event.cc:507
      #6  0x000055e2dcc0736b in sync_array_wait_event (arr=0x55e2de6b9330, cell=@0x7fef035059e0: 0x7fef08521050) at /data/src/10.2/storage/innobase/sync/sync0arr.cc:471
      #7  0x000055e2dca75187 in TTASEventMutex<GenericPolicy>::enter (this=0x55e2de879e80, max_spins=60, max_delay=4, filename=0x55e2dd275178 "/data/src/10.2/storage/innobase/fts/fts0fts.cc", line=927) at /data/src/10.2/storage/innobase/include/ib0mutex.h:516
      #8  0x000055e2dca732a9 in PolicyMutex<TTASEventMutex<GenericPolicy> >::enter (this=0x55e2de879e80, n_spins=30, n_delay=4, name=0x55e2dd275178 "/data/src/10.2/storage/innobase/fts/fts0fts.cc", line=927) at /data/src/10.2/storage/innobase/include/ib0mutex.h:637
      #9  0x000055e2dcd7872e in fts_que_graph_free_check_lock (fts_table=0x7fef03505b00, index_cache=0x0, graph=0x7feeb006b6b0) at /data/src/10.2/storage/innobase/fts/fts0fts.cc:927
      #10 0x000055e2dcd7bb77 in fts_cmp_set_sync_doc_id (table=0x7feeb4032730, cmp_doc_id=0, read_only=1, doc_id=0x7fef03505f88) at /data/src/10.2/storage/innobase/fts/fts0fts.cc:2679
      #11 0x000055e2dcd83b8e in fts_init_index (table=0x7feeb4032730, has_cache_lock=1) at /data/src/10.2/storage/innobase/fts/fts0fts.cc:6344
      #12 0x000055e2dcd80a9b in fts_init_doc_id (table=0x7feeb4032730) at /data/src/10.2/storage/innobase/fts/fts0fts.cc:4867
      #13 0x000055e2dcb9311f in init_fts_doc_id_for_ref (table=0x7feeb0173370, depth=0x7fef03506050) at /data/src/10.2/storage/innobase/row/row0mysql.cc:1723
      #14 0x000055e2dcb93364 in row_update_for_mysql (prebuilt=0x7feeb00a47c0) at /data/src/10.2/storage/innobase/row/row0mysql.cc:1772
      #15 0x000055e2dca53f47 in ha_innobase::delete_row (this=0x7feeb00a0258, record=0x7feeb012aaf0 "\377\017") at /data/src/10.2/storage/innobase/handler/ha_innodb.cc:9061
      #16 0x000055e2dc8544ce in handler::ha_delete_row (this=0x7feeb00a0258, buf=0x7feeb012aaf0 "\377\017") at /data/src/10.2/sql/handler.cc:6178
      #17 0x000055e2dc9d8f61 in mysql_delete (thd=0x7feeb0000d90, table_list=0x7feeb00127e0, conds=0x0, order_list=0x7feeb0005328, limit=1, options=0, result=0x0) at /data/src/10.2/sql/sql_delete.cc:583
      #18 0x000055e2dc5c45a9 in mysql_execute_command (thd=0x7feeb0000d90) at /data/src/10.2/sql/sql_parse.cc:4397
      #19 0x000055e2dc5cf091 in mysql_parse (thd=0x7feeb0000d90, rawbuf=0x7feeb00126f8 "DELETE FROM t1 ORDER BY a LIMIT 5", length=33, parser_state=0x7fef035075f0, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:7763
      #20 0x000055e2dc5bd36a in dispatch_command (command=COM_QUERY, thd=0x7feeb0000d90, packet=0x7feeb0008b51 "DELETE FROM t1 ORDER BY a LIMIT 5", packet_length=33, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:1827
      #21 0x000055e2dc5bbe65 in do_command (thd=0x7feeb0000d90) at /data/src/10.2/sql/sql_parse.cc:1381
      #22 0x000055e2dc7168ba in do_handle_one_connection (connect=0x55e2debdd450) at /data/src/10.2/sql/sql_connect.cc:1336
      #23 0x000055e2dc71661f in handle_one_connection (arg=0x55e2debdd450) at /data/src/10.2/sql/sql_connect.cc:1241
      #24 0x000055e2dcf3ed22 in pfs_spawn_thread (arg=0x55e2debc0840) at /data/src/10.2/storage/perfschema/pfs.cc:1869
      #25 0x00007fef0d5f8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #26 0x00007fef0d1d4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      On 10.6 (scroll the code block for the 2nd conflicting thread):

      10.6 a1542f8a

      2021-02-16  2:10:04 5 [ERROR] InnoDB: In ALTER TABLE `test`.`t2` has or is referenced in foreign key constraints which are not compatible with the new table definition.
      2021-02-16  2:10:04 5 [Warning] InnoDB: In ALTER TABLE `test`.`t2` has or is referenced in foreign key constraints which are not compatible with the new table definition.
      CURRENT_TEST: bug.mutex2
      2021-02-16  2:10:05 10 [ERROR] InnoDB: In ALTER TABLE `test`.`t2` has or is referenced in foreign key constraints which are not compatible with the new table definition.
      2021-02-16  2:10:05 10 [Note] InnoDB: Deferring DROP TABLE `test`.`FTS_0000000000000038_CONFIG`; renaming to test/#sql-ib59
      safe_mutex: Trying to destroy a mutex cache->lock that was locked at /data/src/10.6/storage/innobase/fts/fts0fts.cc, line 4785 at /data/src/10.6/storage/innobase/fts/fts0fts.cc, line 294
      210216  2:10:05 [ERROR] mysqld got signal 6 ;
       
      #5  0x00007efcf3802859 in __GI_abort () at abort.c:79
      #6  0x000056145aa6d0b4 in safe_mutex_destroy (mp=0x7efcb006e4e8, file=0x56145af975e8 "/data/src/10.6/storage/innobase/fts/fts0fts.cc", line=294) at /data/src/10.6/mysys/thr_mutex.c:600
      #7  0x000056145a95b40e in inline_mysql_mutex_destroy (that=0x7efcb006e4e8, src_file=0x56145af975e8 "/data/src/10.6/storage/innobase/fts/fts0fts.cc", src_line=294) at /data/src/10.6/include/mysql/psi/mysql_thread.h:724
      #8  0x000056145a95fcee in fts_cache_destroy (cache=0x7efcb006e4e8) at /data/src/10.6/storage/innobase/fts/fts0fts.cc:294
      #9  0x000056145a96b047 in fts_t::~fts_t (this=0x7efcb005c4c8, __in_chrg=<optimized out>) at /data/src/10.6/storage/innobase/fts/fts0fts.cc:5284
      #10 0x000056145a96b11f in fts_free (table=0x7efcb005f898) at /data/src/10.6/storage/innobase/fts/fts0fts.cc:5321
      #11 0x000056145a77022a in row_drop_ancillary_fts_tables (table=0x7efcb005f898, trx=0x7efcede683d8) at /data/src/10.6/storage/innobase/row/row0mysql.cc:3201
      #12 0x000056145a77139e in row_drop_table_for_mysql (name=0x7efcecb6c440 "test/#sql-alter-fcbe8-a", trx=0x7efcede683d8, sqlcom=SQLCOM_ALTER_TABLE, create_failed=false, nonatomic=true) at /data/src/10.6/storage/innobase/row/row0mysql.cc:3630
      #13 0x000056145a5e18d2 in ha_innobase::delete_table (this=0x7efcb0017d08, name=0x7efcecb6d540 "./test/#sql-alter-fcbe8-a", sqlcom=SQLCOM_ALTER_TABLE) at /data/src/10.6/storage/innobase/handler/ha_innodb.cc:13012
      #14 0x000056145a5c8628 in ha_innobase::delete_table (this=0x7efcb0017d08, name=0x7efcecb6d540 "./test/#sql-alter-fcbe8-a") at /data/src/10.6/storage/innobase/handler/ha_innodb.cc:13139
      #15 0x000056145a13b7e3 in hton_drop_table (hton=0x56145d39cf48, path=0x7efcecb6d540 "./test/#sql-alter-fcbe8-a") at /data/src/10.6/sql/handler.cc:564
      #16 0x000056145a140f0f in ha_delete_table (thd=0x7efcb0000db8, hton=0x56145d39cf48, path=0x7efcecb6d540 "./test/#sql-alter-fcbe8-a", db=0x7efcecb6e8b0, alias=0x7efcecb6e8e0, generate_warning=false) at /data/src/10.6/sql/handler.cc:2770
      #17 0x0000561459ec3c61 in quick_rm_table (thd=0x7efcb0000db8, base=0x56145d39cf48, db=0x7efcecb6e8b0, table_name=0x7efcecb6e8e0, flags=3, table_path=0x0) at /data/src/10.6/sql/sql_table.cc:2915
      #18 0x0000561459edb960 in mysql_alter_table (thd=0x7efcb0000db8, new_db=0x7efcb0005830, new_name=0x7efcb0005c30, create_info=0x7efcecb6f480, table_list=0x7efcb0014f90, alter_info=0x7efcecb6f3b0, order_num=0, order=0x0, ignore=false, if_exists=false) at /data/src/10.6/sql/sql_table.cc:11002
      #19 0x0000561459f82d54 in Sql_cmd_alter_table::execute (this=0x7efcb0015670, thd=0x7efcb0000db8) at /data/src/10.6/sql/sql_alter.cc:539
      #20 0x0000561459dd9683 in mysql_execute_command (thd=0x7efcb0000db8) at /data/src/10.6/sql/sql_parse.cc:5880
      #21 0x0000561459ddf9ee in mysql_parse (thd=0x7efcb0000db8, rawbuf=0x7efcb0014ea0 "ALTER TABLE t2 FORCE, ALGORITHM=COPY", length=36, parser_state=0x7efcecb70510) at /data/src/10.6/sql/sql_parse.cc:7906
      #22 0x0000561459dcbf31 in dispatch_command (command=COM_QUERY, thd=0x7efcb0000db8, packet=0x7efcb0008e49 "", packet_length=36) at /data/src/10.6/sql/sql_parse.cc:1833
      #23 0x0000561459dca948 in do_command (thd=0x7efcb0000db8) at /data/src/10.6/sql/sql_parse.cc:1365
      #24 0x0000561459f78117 in do_handle_one_connection (connect=0x56145d83d048, put_in_cache=true) at /data/src/10.6/sql/sql_connect.cc:1410
      #25 0x0000561459f77e7a in handle_one_connection (arg=0x56145d38b8f8) at /data/src/10.6/sql/sql_connect.cc:1312
      #26 0x000056145a4d5e97 in pfs_spawn_thread (arg=0x56145d2bbdd8) at /data/src/10.6/storage/perfschema/pfs.cc:2201
      #27 0x00007efcf3d2b609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #28 0x00007efcf38ff293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
       
      Thread 12 (Thread 0x7efcecbbc700 (LWP 1035255)):
      #0  __lll_lock_wait (futex=futex@entry=0x56145b544440 <dict_sys+128>, private=0) at lowlevellock.c:52
      #1  0x00007efcf3d2e0a3 in __GI___pthread_mutex_lock (mutex=0x56145b544440 <dict_sys+128>) at ../nptl/pthread_mutex_lock.c:80
      #2  0x000056145aa6c0fe in safe_mutex_lock (mp=0x56145b544418 <dict_sys+88>, my_flags=0, file=0x56145af70620 "/data/src/10.6/storage/innobase/dict/dict0dict.cc", line=1077) at /data/src/10.6/mysys/thr_mutex.c:290
      #3  0x000056145a8def13 in inline_mysql_mutex_lock (that=0x56145b544418 <dict_sys+88>, src_file=0x56145af70620 "/data/src/10.6/storage/innobase/dict/dict0dict.cc", src_line=1077) at /data/src/10.6/include/mysql/psi/mysql_thread.h:750
      #4  0x000056145a8e5202 in dict_sys_t::mutex_lock_wait (this=0x56145b5443c0 <dict_sys>) at /data/src/10.6/storage/innobase/dict/dict0dict.cc:1077
      #5  0x000056145a8e54b9 in dict_sys_t::mutex_lock (this=0x56145b5443c0 <dict_sys>) at /data/src/10.6/storage/innobase/dict/dict0dict.cc:1101
      #6  0x000056145a96149e in fts_que_graph_free_check_lock (fts_table=0x7efcecbb9db0, index_cache=0x0, graph=0x7efcb8067a48) at /data/src/10.6/storage/innobase/fts/fts0fts.cc:915
      #7  0x000056145a964e27 in fts_cmp_set_sync_doc_id (table=0x7efcb005f898, cmp_doc_id=0, read_only=0, doc_id=0x7efcecbba238) at /data/src/10.6/storage/innobase/fts/fts0fts.cc:2640
      #8  0x000056145a96a160 in fts_init_doc_id (table=0x7efcb005f898) at /data/src/10.6/storage/innobase/fts/fts0fts.cc:4797
      #9  0x000056145a76bfc0 in init_fts_doc_id_for_ref (table=0x7efcb8b3eb78, depth=0x7efcecbba2b0) at /data/src/10.6/storage/innobase/row/row0mysql.cc:1693
      #10 0x000056145a76c298 in row_update_for_mysql (prebuilt=0x7efcb8bac2a8) at /data/src/10.6/storage/innobase/row/row0mysql.cc:1742
      #11 0x000056145a5be16b in ha_innobase::delete_row (this=0x7efcb8116b10, record=0x7efcb8ca0128 "\377\b") at /data/src/10.6/storage/innobase/handler/ha_innodb.cc:8267
      #12 0x000056145a15126f in handler::ha_delete_row (this=0x7efcb8116b10, buf=0x7efcb8ca0128 "\377\b") at /data/src/10.6/sql/handler.cc:7269
      #13 0x000056145a32e0d9 in TABLE::delete_row (this=0x7efcb82063f8) at /data/src/10.6/sql/sql_delete.cc:280
      #14 0x000056145a32ae87 in mysql_delete (thd=0x7efcb8000db8, table_list=0x7efcb8013db8, conds=0x0, order_list=0x7efcb8005a28, limit=3, options=0, result=0x0) at /data/src/10.6/sql/sql_delete.cc:815
      #15 0x0000561459dd4d65 in mysql_execute_command (thd=0x7efcb8000db8) at /data/src/10.6/sql/sql_parse.cc:4695
      #16 0x0000561459ddf9ee in mysql_parse (thd=0x7efcb8000db8, rawbuf=0x7efcb8013cd0 "DELETE FROM t1 ORDER BY a LIMIT 5", length=33, parser_state=0x7efcecbbb510) at /data/src/10.6/sql/sql_parse.cc:7906
      #17 0x0000561459dcbf31 in dispatch_command (command=COM_QUERY, thd=0x7efcb8000db8, packet=0x7efcb80440e9 "DELETE FROM t1 ORDER BY a LIMIT 5", packet_length=33) at /data/src/10.6/sql/sql_parse.cc:1833
      #18 0x0000561459dca948 in do_command (thd=0x7efcb8000db8) at /data/src/10.6/sql/sql_parse.cc:1365
      #19 0x0000561459f78117 in do_handle_one_connection (connect=0x56145d867028, put_in_cache=true) at /data/src/10.6/sql/sql_connect.cc:1410
      #20 0x0000561459f77e7a in handle_one_connection (arg=0x56145d84f7a8) at /data/src/10.6/sql/sql_connect.cc:1312
      #21 0x000056145a4d5e97 in pfs_spawn_thread (arg=0x56145d8cb688) at /data/src/10.6/storage/perfschema/pfs.cc:2201
      #22 0x00007efcf3d2b609 in start_thread (arg=<optimized out>) at pthread_create.c:477
      #23 0x00007efcf38ff293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
      

      The 10.2 version of the failure may be related to MDEV-24076, it's hard to say for sure from what buildbot returned in there.

      Also, the failure happens interchangeably with MDEV-18421. I don't know if it's the same bug (same root cause), or a separate problem revealed by the same scenario.
      On a non-debug version I am getting MDEV-18421.

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              Assignee:
              marko Marko Mäkelä
              Reporter:
              elenst Elena Stepanova
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