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  1. MariaDB Server
  2. MDEV-27026

innodb_fts.concurrent_insert failed in bb, innodb_fatal_semaphore_wait_threshold was exceeded for dict_sys.latch

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      Description

      https://buildbot.askmonty.org/buildbot/builders/kvm-fulltest2/builds/31734/steps/mtr_nm/logs/stdio

      10.7 a52cd4aedac70676eb100afc8779e

      nnodb_fts.concurrent_insert 'innodb'    w2 [ fail ]
              Test ended at 2021-10-27 18:43:58
       
      CURRENT_TEST: innodb_fts.concurrent_insert
      mysqltest: At line 48: query 'reap' failed: <Unknown> (2013): Lost connection to server during query
       
      The result from queries just before the failure was:
      < snip >
      #
      # MDEV-19529 InnoDB hang on DROP FULLTEXT INDEX
      #
      CREATE TABLE t1(f1 CHAR(100), FULLTEXT(f1))ENGINE=InnoDB;
      INSERT INTO t1 VALUES('test');
      CREATE TABLE t2 (f1 char(100), FULLTEXT idx1(f1))ENGINE=InnoDB;
      INSERT INTO t2 VALUES('mariadb');
      connection default;
      SET @saved_dbug = @@GLOBAL.debug_dbug;
      SET GLOBAL debug_dbug ='+d,fts_instrument_sync_request,ib_optimize_wq_hang';
      SET DEBUG_SYNC= 'fts_instrument_sync_request
      		 SIGNAL drop_index_start WAIT_FOR sync_op';
      INSERT INTO t1 VALUES('Keyword');
      connect con1,localhost,root,,,;
      SET DEBUG_SYNC='now WAIT_FOR drop_index_start';
      SET DEBUG_SYNC= 'norebuild_fts_drop SIGNAL sync_op WAIT_FOR fts_drop_index';
      ALTER TABLE t2 drop index idx1;
      connection default;
      set DEBUG_SYNC= 'now SIGNAL fts_drop_index';
      connection con1;
       
      More results from queries before failure can be found in /mnt/buildbot/build/mariadb-10.7.1/mysql-test/var/2/log/concurrent_insert.log
       
       
      Server [mysqld.1 - pid: 5140, winpid: 5140, exit: 256] failed during test run
      Server log from this test:
      ----------SERVER LOG START-----------
      2021-10-27 18:43:56 0 [ERROR] [FATAL] InnoDB: innodb_fatal_semaphore_wait_threshold was exceeded for dict_sys.latch. Please refer to https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/
      211027 18:43:56 [ERROR] mysqld got signal 6 ;
      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: 10.7.1-MariaDB-debug-log
      key_buffer_size=1048576
      read_buffer_size=131072
      max_used_connections=2
      max_threads=153
      thread_count=2
      It is possible that mysqld could use up to 
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 62396 K  bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
       
      Thread pointer: 0x0
      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 = 0x0 thread_stack 0x49000
      mysys/stacktrace.c:212(my_print_stacktrace)[0x81333154]
      sql/signal_handler.cc:224(handle_fatal_signal)[0x80aa6c58]
      addr2line: '': No such file
      [0xb77a1c14]
      Printing to addr2line failed
      [0xb77a1c31]
      ??:0(gsignal)[0xb7020e89]
      ??:0(abort)[0xb70223e7]
      ut/ut0ut.cc:526(ib::error_or_warn::~error_or_warn())[0x81177fb8]
      srv/srv0srv.cc:1320(srv_monitor_task)[0x8111fd4f]
      tpool/tpool_generic.cc:313(tpool::thread_pool_generic::timer_generic::run())[0x8139b4a0]
      tpool/tpool_generic.cc:332(tpool::thread_pool_generic::timer_generic::execute(void*))[0x8139b5ce]
      tpool/task.cc:37(tpool::task::execute())[0x813a14d2]
      tpool/tpool_generic.cc:549(tpool::thread_pool_generic::worker_main(tpool::worker_data*))[0x81399993]
      5/functional:600(void std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const)[0x813a0f17]
      5/functional:1531(void std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>))[0x813a0ea8]
      5/functional:1520(std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()())[0x813a0d0d]
      5/thread:115(std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run())[0x813a0c94]
      ??:0(std::this_thread::__sleep_for(std::chrono::duration<long long, std::ratio<1ll, 1ll> >, std::chrono::duration<long long, std::ratio<1ll, 1000000000ll> >))[0xb72bb5de]
      ??:0(start_thread)[0xb73a02b5]
      ??:0(clone)[0xb70dc16e]
      The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains
      information that should help you find out what is causing the crash.
      Writing a core file...
      Working directory at /dev/shm/var_auto_66ir/2/mysqld.1/data
      Resource Limits:
      Limit                     Soft Limit           Hard Limit           Units     
      Max cpu time              unlimited            unlimited            seconds   
      Max file size             unlimited            unlimited            bytes     
      Max data size             unlimited            unlimited            bytes     
      Max stack size            8388608              unlimited            bytes     
      Max core file size        unlimited            unlimited            bytes     
      Max resident set          unlimited            unlimited            bytes     
      Max processes             64511                64511                processes 
      Max open files            1024                 1024                 files     
      Max locked memory         65536                65536                bytes     
      Max address space         unlimited            unlimited            bytes     
      Max file locks            unlimited            unlimited            locks     
      Max pending signals       64511                64511                signals   
      Max msgqueue size         819200               819200               bytes     
      Max nice priority         0                    0                    
      Max realtime priority     0                    0                    
      Max realtime timeout      unlimited            unlimited            us        
      Core pattern: |/usr/share/apport/apport %p %s %c %P
       
      ----------SERVER LOG END-------------
      

      [New LWP 5163]
      [New LWP 5141]
      [Thread debugging using libthread_db enabled]
      Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
      Core was generated by `/mnt/buildbot/build/mariadb-10.7.1/sql/mariadbd --defaults-group-suffix=.1 --de'.
      Program terminated with signal SIGABRT, Aborted.
      #0  0xb77a1c31 in __kernel_vsyscall ()
      [Current thread is 1 (Thread 0xac1fbb40 (LWP 5158))]
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb73a6ce1 in pthread_kill () from /lib/i386-linux-gnu/libpthread.so.0
      #2  0x8133324e in my_write_core (sig=6) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/stacktrace.c:424
      #3  0x80aa6fc6 in handle_fatal_signal (sig=6) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/signal_handler.cc:345
      #4  <signal handler called>
      #5  0xb77a1c31 in __kernel_vsyscall ()
      #6  0xb7020e89 in raise () from /lib/i386-linux-gnu/libc.so.6
      #7  0xb70223e7 in abort () from /lib/i386-linux-gnu/libc.so.6
      #8  0x81177fb8 in ib::fatal::~fatal (this=0xac1fb004, __in_chrg=<optimized out>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/ut/ut0ut.cc:519
      #9  0x8111fd4f in srv_monitor_task () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1317
      #10 0x8139b4a0 in tpool::thread_pool_generic::timer_generic::run (this=0x835abb78) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:313
      #11 0x8139b5ce in tpool::thread_pool_generic::timer_generic::execute (arg=0x835abb78) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:332
      #12 0x813a14d2 in tpool::task::execute (this=0x835abba0) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task.cc:37
      #13 0x81399993 in tpool::thread_pool_generic::worker_main (this=0x833f93d8, thread_var=0x834d35e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:549
      #14 0x813a0f17 in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const (this=0xaf600a00, __object=0x833f93d8) at /usr/include/c++/5/functional:600
      #15 0x813a0ea8 in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>) (this=0xaf6009f8) at /usr/include/c++/5/functional:1531
      #16 0x813a0d0d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0xaf6009f8) at /usr/include/c++/5/functional:1520
      #17 0x813a0c94 in std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0xaf6009ec) at /usr/include/c++/5/thread:115
      #18 0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #19 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #20 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 16 (Thread 0xb6e62800 (LWP 5141)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d1f8f in poll () from /lib/i386-linux-gnu/libc.so.6
      #2  0x805917fc in handle_connections_sockets () at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/mysqld.cc:6152
      #3  0x80590ded in mysqld_main (argc=155, argv=0x832fbe54) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/mysqld.cc:5857
      #4  0x8058473b in main (argc=23, argv=0xbf979b64) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/main.cc:34
       
      Thread 15 (Thread 0xb06f8b40 (LWP 5163)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d1f8f in poll () from /lib/i386-linux-gnu/libc.so.6
      #2  0x80ca5a3b in vio_io_wait (vio=0x838afd28, event=VIO_IO_EVENT_READ, timeout=28800000) at /home/buildbot/buildbot/build/mariadb-10.7.1/vio/viosocket.c:948
      #3  0x80ca427b in vio_socket_io_wait (vio=0x838afd28, event=VIO_IO_EVENT_READ) at /home/buildbot/buildbot/build/mariadb-10.7.1/vio/viosocket.c:116
      #4  0x80ca43ec in vio_read (vio=0x838afd28, buf=0x837ec1c0 "\a", size=4) at /home/buildbot/buildbot/build/mariadb-10.7.1/vio/viosocket.c:182
      #5  0x80c57c53 in my_real_read (net=0x837e55ac, complen=0xb06f80c8, header=1 '\001') at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/net_serv.cc:1003
      #6  0x80c5849e in my_net_read_packet_reallen (net=0x837e55ac, read_from_server=1 '\001', reallen=0xb06f813c) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/net_serv.cc:1284
      #7  0x80c58450 in my_net_read_packet (net=0x837e55ac, read_from_server=1 '\001') at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/net_serv.cc:1268
      #8  0x80709120 in do_command (thd=0x837e53c8, blocking=true) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_parse.cc:1264
      #9  0x808c8f81 in do_handle_one_connection (connect=0x83925018, put_in_cache=true) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_connect.cc:1418
      #10 0x808c8bba in handle_one_connection (arg=0x8374abb8) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_connect.cc:1312
      #11 0x80dabb5d in pfs_spawn_thread (arg=0x837e53c8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/perfschema/pfs.cc:2201
      #12 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #13 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 14 (Thread 0xac9fcb40 (LWP 5157)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d7bb7 in syscall () from /lib/i386-linux-gnu/libc.so.6
      #2  0x8112fa7e in srw_mutex_impl<false>::wait (this=0x81dde044 <dict_sys+68>, lk=2147483652) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:348
      #3  0x8112eb3c in srw_mutex_impl<false>::wait_and_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:461
      #4  0x80f22fb8 in srw_mutex_impl<false>::wr_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:80
      #5  0x8112f5f4 in ssux_lock_impl<false>::rd_wait (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:523
      #6  0x81097f38 in ssux_lock_impl<false>::rd_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:214
      #7  0x8112f6a7 in srw_lock_impl<false>::psi_rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:581
      #8  0x81133c1d in srw_lock_impl<false>::rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:481
      #9  0x8122b433 in dict_sys_t::freeze (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:997
      #10 0x8122a772 in dict_table_open_on_id (table_id=1, dict_locked=false, table_op=DICT_TABLE_OP_NORMAL, thd=0x8365fc28, mdl=0x8359833c) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:834
      #11 0x810ddf83 in row_purge_parse_undo_rec (node=0x83598240, undo_rec=0x8359ffe0 "", thr=0x835981e8, updated_extern=0xac9fbff2) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1028
      #12 0x810de98b in row_purge (node=0x83598240, undo_rec=0x8359ffe0 "", thr=0x835981e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1206
      #13 0x810deb5e in row_purge_step (thr=0x835981e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1258
      #14 0x8104dc2f in que_thr_step (thr=0x835981e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:653
      #15 0x8104deb2 in que_run_threads_low (thr=0x835981e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:709
      #16 0x8104dfd3 in que_run_threads (thr=0x835981e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:729
      #17 0x81121af6 in srv_task_execute () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1716
      #18 0x811221d2 in purge_worker_callback () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1960
      #19 0x813a1107 in tpool::task_group::execute (this=0x8281b640 <purge_task_group>, t=0x8281b3c0 <purge_worker_task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task_group.cc:55
      #20 0x813a14bb in tpool::task::execute (this=0x8281b3c0 <purge_worker_task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task.cc:32
      #21 0x81399993 in tpool::thread_pool_generic::worker_main (this=0x833f93d8, thread_var=0x834d3668) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:549
      #22 0x813a0f17 in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const (this=0xaf600918, __object=0x833f93d8) at /usr/include/c++/5/functional:600
      #23 0x813a0ea8 in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>) (this=0xaf600910) at /usr/include/c++/5/functional:1531
      #24 0x813a0d0d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0xaf600910) at /usr/include/c++/5/functional:1520
      #25 0x813a0c94 in std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0xaf600904) at /usr/include/c++/5/thread:115
      #26 0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #27 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #28 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 13 (Thread 0xad9feb40 (LWP 5155)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d7bb7 in syscall () from /lib/i386-linux-gnu/libc.so.6
      #2  0x8112fa7e in srw_mutex_impl<false>::wait (this=0x81dde044 <dict_sys+68>, lk=2147483653) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:348
      #3  0x8112eb3c in srw_mutex_impl<false>::wait_and_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:461
      #4  0x80f22fb8 in srw_mutex_impl<false>::wr_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:80
      #5  0x8112f5f4 in ssux_lock_impl<false>::rd_wait (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:523
      #6  0x81097f38 in ssux_lock_impl<false>::rd_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:214
      #7  0x8112f6a7 in srw_lock_impl<false>::psi_rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:581
      #8  0x81133c1d in srw_lock_impl<false>::rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:481
      #9  0x8122b433 in dict_sys_t::freeze (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:997
      #10 0x8122a772 in dict_table_open_on_id (table_id=4, dict_locked=false, table_op=DICT_TABLE_OP_NORMAL, thd=0x83658940, mdl=0x835924fc) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:834
      #11 0x810ddf83 in row_purge_parse_undo_rec (node=0x83592400, undo_rec=0x835a00a8 "", thr=0x83591b48, updated_extern=0xad9fdec2) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1028
      #12 0x810de98b in row_purge (node=0x83592400, undo_rec=0x835a00a8 "", thr=0x83591b48) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1206
      #13 0x810deb5e in row_purge_step (thr=0x83591b48) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1258
      #14 0x8104dc2f in que_thr_step (thr=0x83591b48) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:653
      #15 0x8104deb2 in que_run_threads_low (thr=0x83591b48) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:709
      #16 0x8104dfd3 in que_run_threads (thr=0x83591b48) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:729
      #17 0x8113a1f1 in trx_purge (n_tasks=4, truncate=false) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/trx/trx0purge.cc:1299
      #18 0x8112366a in purge_coordinator_state::do_purge (this=0x8281b560 <purge_state>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1815
      #19 0x811222a8 in purge_coordinator_callback () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1969
      #20 0x813a1107 in tpool::task_group::execute (this=0x8281b6c0 <purge_coordinator_task_group>, t=0x8281b740 <purge_coordinator_task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task_group.cc:55
      #21 0x813a14bb in tpool::task::execute (this=0x8281b740 <purge_coordinator_task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task.cc:32
      #22 0x81399993 in tpool::thread_pool_generic::worker_main (this=0x833f93d8, thread_var=0x834d3768) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:549
      #23 0x813a0f17 in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const (this=0xaf600748, __object=0x833f93d8) at /usr/include/c++/5/functional:600
      #24 0x813a0ea8 in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>) (this=0xaf600740) at /usr/include/c++/5/functional:1531
      #25 0x813a0d0d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0xaf600740) at /usr/include/c++/5/functional:1520
      #26 0x813a0c94 in std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0xaf600734) at /usr/include/c++/5/thread:115
      #27 0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #28 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #29 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 12 (Thread 0xb05fdb40 (LWP 5149)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb73a5a8c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
      #2  0x81337a42 in safe_cond_wait (cond=0x81ddd2cc <buf_pool+17100>, mp=0x81ddd240 <buf_pool+16960>, file=0x81853988 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/buf/buf0flu.cc", line=2202) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/thr_mutex.c:494
      #3  0x81206868 in buf_flush_page_cleaner () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/buf/buf0flu.cc:2202
      #4  0x8120afc3 in std::_Bind_simple<void (*())()>::_M_invoke<>(std::_Index_tuple<>) (this=0x83567650) at /usr/include/c++/5/functional:1531
      #5  0x8120af05 in std::_Bind_simple<void (*())()>::operator()() (this=0x83567650) at /usr/include/c++/5/functional:1520
      #6  0x8120ae8c in std::thread::_Impl<std::_Bind_simple<void (*())()> >::_M_run() (this=0x83567644) at /usr/include/c++/5/thread:115
      #7  0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #8  0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #9  0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 11 (Thread 0xb19feb40 (LWP 5148)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d7bb7 in syscall () from /lib/i386-linux-gnu/libc.so.6
      #2  0x813a1ad0 in my_getevents (ctx=0xb3329000, min_nr=1, nr=256, ev=0xb19fc1c0) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/aio_linux.cc:63
      #3  0x813a1c35 in tpool::aio_linux::getevent_thread_routine (aio=0x834574c8) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/aio_linux.cc:104
      #4  0x813a327c in std::_Bind_simple<void (*(tpool::aio_linux*))(tpool::aio_linux*)>::_M_invoke<0u>(std::_Index_tuple<0u>) (this=0x833b3d28) at /usr/include/c++/5/functional:1531
      #5  0x813a3151 in std::_Bind_simple<void (*(tpool::aio_linux*))(tpool::aio_linux*)>::operator()() (this=0x833b3d28) at /usr/include/c++/5/functional:1520
      #6  0x813a30d8 in std::thread::_Impl<std::_Bind_simple<void (*(tpool::aio_linux*))(tpool::aio_linux*)> >::_M_run() (this=0x833b3d1c) at /usr/include/c++/5/thread:115
      #7  0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #8  0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #9  0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 10 (Thread 0xab1f9b40 (LWP 5160)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d7bb7 in syscall () from /lib/i386-linux-gnu/libc.so.6
      #2  0x8112fa7e in srw_mutex_impl<false>::wait (this=0x81dde044 <dict_sys+68>, lk=2147483650) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:348
      #3  0x8112eb3c in srw_mutex_impl<false>::wait_and_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:461
      #4  0x80f22fb8 in srw_mutex_impl<false>::wr_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:80
      #5  0x8112f5f4 in ssux_lock_impl<false>::rd_wait (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:523
      #6  0x81097f38 in ssux_lock_impl<false>::rd_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:214
      #7  0x8112f6a7 in srw_lock_impl<false>::psi_rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=619) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:581
      #8  0x81133c1d in srw_lock_impl<false>::rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=619) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:481
      #9  0x8122b433 in dict_sys_t::freeze (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=619) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:997
      #10 0x81237d52 in dict_table_t::parse_name<false> (this=0x838fd310, db_name=..., tbl_name=..., db_name_len=0xab1f8acc, tbl_name_len=0xab1f8ad0) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:619
      #11 0x81238ab8 in dict_acquire_mdl_shared<true> (table=0x838fd310, thd=0x835b51e0, mdl=0xab1f8fcc, table_op=DICT_TABLE_OP_NORMAL) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:784
      #12 0x812be85c in fts_optimize_sync_table (table=0x838fd310, process_message=true) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/fts/fts0opt.cc:2785
      #13 0x812bed5c in fts_optimize_callback () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/fts/fts0opt.cc:2894
      #14 0x813a1107 in tpool::task_group::execute (this=0x82821920 <_ZL10task_group>, t=0x82821988 <task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task_group.cc:55
      #15 0x813a14bb in tpool::task::execute (this=0x82821988 <task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task.cc:32
      #16 0x81399993 in tpool::thread_pool_generic::worker_main (this=0x833f93d8, thread_var=0x834d34e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:549
      #17 0x813a0f17 in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const (this=0xaf600bd0, __object=0x833f93d8) at /usr/include/c++/5/functional:600
      #18 0x813a0ea8 in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>) (this=0xaf600bc8) at /usr/include/c++/5/functional:1531
      #19 0x813a0d0d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0xaf600bc8) at /usr/include/c++/5/functional:1520
      #20 0x813a0c94 in std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0xaf600bbc) at /usr/include/c++/5/thread:115
      #21 0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #22 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #23 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 9 (Thread 0xb0742b40 (LWP 5162)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb73a5a8c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
      #2  0x81337a42 in safe_cond_wait (cond=0x81f88020 <COND_manager>, mp=0x81f87fa0 <LOCK_manager>, file=0x818bc8e4 "/home/buildbot/buildbot/build/mariadb-10.7.1/mysys/my_thr_init.c", line=596) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/thr_mutex.c:494
      #3  0x813318e9 in psi_cond_wait (that=0x81f88020 <COND_manager>, mutex=0x81f87fa0 <LOCK_manager>, file=0x81443be4 "/home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_manager.cc", line=103) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/my_thr_init.c:596
      #4  0x80704154 in inline_mysql_cond_wait (that=0x81f88020 <COND_manager>, mutex=0x81f87fa0 <LOCK_manager>, src_file=0x81443be4 "/home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_manager.cc", src_line=103) at /home/buildbot/buildbot/build/mariadb-10.7.1/include/mysql/psi/mysql_thread.h:1070
      #5  0x80704586 in handle_manager (arg=0x0) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_manager.cc:103
      #6  0x80dabb5d in pfs_spawn_thread (arg=0x836ebf68) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/perfschema/pfs.cc:2201
      #7  0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #8  0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 8 (Thread 0xb078cb40 (LWP 5161)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb7021e8c in sigwaitinfo () from /lib/i386-linux-gnu/libc.so.6
      #2  0x805847f4 in my_sigwait (set=0xb078c190, sig=0xb078c160, code=0xb078c164) at /home/buildbot/buildbot/build/mariadb-10.7.1/include/my_pthread.h:195
      #3  0x8058aaa1 in signal_hand (arg=0x0) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/mysqld.cc:3144
      #4  0x80dabb5d in pfs_spawn_thread (arg=0x836f08e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/perfschema/pfs.cc:2201
      #5  0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #6  0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 7 (Thread 0xafdfcb40 (LWP 5216)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d7bb7 in syscall () from /lib/i386-linux-gnu/libc.so.6
      #2  0x8112fb3f in ssux_lock_impl<false>::wait (this=0x81dde044 <dict_sys+68>, lk=2147483649) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:354
      #3  0x8112f548 in ssux_lock_impl<false>::wr_wait (this=0x81dde044 <dict_sys+68>, lk=2147483649) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:509
      #4  0x80f1f74f in ssux_lock_impl<false>::wr_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:232
      #5  0x8112f76d in srw_lock_impl<false>::psi_wr_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=4272) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:598
      #6  0x810014f9 in srw_lock_impl<false>::wr_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=4272) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:494
      #7  0x8122adfa in dict_sys_t::lock_wait (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=4272) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:961
      #8  0x80f19c25 in dict_sys_t::lock (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=4272) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/dict0dict.h:1568
      #9  0x81235385 in dict_index_set_merge_threshold (index=0x838a2ba8, merge_threshold=50) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:4272
      #10 0x80f01e21 in innobase_parse_hint_from_comment (thd=0xae3007f8, table=0x83896db0, table_share=0xafdf9d38) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/handler/ha_innodb.cc:11816
      #11 0x80f4f263 in ha_innobase::commit_inplace_alter_table (this=0x839bd8d8, altered_table=0xafdf9278, ha_alter_info=0xafdf9210, commit=true) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/handler/handler0alter.cc:11294
      #12 0x80ab819e in handler::ha_commit_inplace_alter_table (this=0x839bd8d8, altered_table=0xafdf9278, ha_alter_info=0xafdf9210, commit=true) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/handler.cc:5191
      #13 0x8081d425 in mysql_inplace_alter_table (thd=0xae3007f8, table_list=0xae310008, table=0x8389f020, altered_table=0xafdf9278, ha_alter_info=0xafdf9210, target_mdl_request=0xafdf9790, ddl_log_state=0xafdf91dc, trigger_param=0xafdf94dc, alter_ctx=0xafdfa0a4) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_table.cc:7535
      #14 0x80825c3b in mysql_alter_table (thd=0xae3007f8, new_db=0xae3038d4, new_name=0xae303b2c, create_info=0xafdfaddc, table_list=0xae310008, alter_info=0xafdfad60, order_num=0, order=0x0, ignore=false, if_exists=false) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_table.cc:10302
      #15 0x808d40b2 in Sql_cmd_alter_table::execute (this=0xae3104f0, thd=0xae3007f8) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_alter.cc:559
      #16 0x80719b6e in mysql_execute_command (thd=0xae3007f8, is_called_from_prepared_stmt=false) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_parse.cc:5989
      #17 0x8071fc38 in mysql_parse (thd=0xae3007f8, rawbuf=0xae30ff50 "ALTER TABLE t2 drop index idx1", length=30, parser_state=0xafdfb9b0) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_parse.cc:8028
      #18 0x8070b0eb in dispatch_command (command=COM_QUERY, thd=0xae3007f8, packet=0xae307911 "ALTER TABLE t2 drop index idx1", packet_length=30, blocking=true) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_parse.cc:1894
      #19 0x807097e5 in do_command (thd=0xae3007f8, blocking=true) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_parse.cc:1403
      #20 0x808c8f81 in do_handle_one_connection (connect=0x839c16c8, put_in_cache=true) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_connect.cc:1418
      #21 0x808c8bba in handle_one_connection (arg=0x838dc410) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/sql_connect.cc:1312
      #22 0x80dabb5d in pfs_spawn_thread (arg=0x838b9858) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/perfschema/pfs.cc:2201
      #23 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #24 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 6 (Thread 0xb2767b40 (LWP 5145)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb73a5e56 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
      #2  0x81337ced in safe_cond_timedwait (cond=0x827ac5c0 <COND_checkpoint>, mp=0x827ac540 <LOCK_checkpoint>, abstime=0xb276715c, file=0x818bc8e4 "/home/buildbot/buildbot/build/mariadb-10.7.1/mysys/my_thr_init.c", line=609) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/thr_mutex.c:548
      #3  0x8133197d in psi_cond_timedwait (that=0x827ac5c0 <COND_checkpoint>, mutex=0x827ac540 <LOCK_checkpoint>, abstime=0xb276715c, file=0x816af088 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/maria/ma_servicethread.c", line=116) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/my_thr_init.c:609
      #4  0x80d025b6 in inline_mysql_cond_timedwait (that=0x827ac5c0 <COND_checkpoint>, mutex=0x827ac540 <LOCK_checkpoint>, abstime=0xb276715c, src_file=0x816af088 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/maria/ma_servicethread.c", src_line=116) at /home/buildbot/buildbot/build/mariadb-10.7.1/include/mysql/psi/mysql_thread.h:1086
      #5  0x80d02ae7 in my_service_thread_sleep (control=0x81dc79b8 <checkpoint_control>, sleep_time=30000000000) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/maria/ma_servicethread.c:115
      #6  0x80cf618b in ma_checkpoint_background (arg=0x1e) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/maria/ma_checkpoint.c:725
      #7  0x80dabb5d in pfs_spawn_thread (arg=0x834b01a0) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/perfschema/pfs.cc:2201
      #8  0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #9  0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 5 (Thread 0xae1ffb40 (LWP 5154)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d7bb7 in syscall () from /lib/i386-linux-gnu/libc.so.6
      #2  0x8112fa7e in srw_mutex_impl<false>::wait (this=0x81dde044 <dict_sys+68>, lk=2147483655) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:348
      #3  0x8112eb3c in srw_mutex_impl<false>::wait_and_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:461
      #4  0x80f22fb8 in srw_mutex_impl<false>::wr_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:80
      #5  0x8112f5f4 in ssux_lock_impl<false>::rd_wait (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:523
      #6  0x81097f38 in ssux_lock_impl<false>::rd_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:214
      #7  0x8112f6a7 in srw_lock_impl<false>::psi_rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:581
      #8  0x81133c1d in srw_lock_impl<false>::rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:481
      #9  0x8122b433 in dict_sys_t::freeze (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:997
      #10 0x8122a772 in dict_table_open_on_id (table_id=3, dict_locked=false, table_op=DICT_TABLE_OP_NORMAL, thd=0x8366e1f8, mdl=0x83591b0c) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:834
      #11 0x810ddf83 in row_purge_parse_undo_rec (node=0x83591a10, undo_rec=0x835a0020 "", thr=0x835919b8, updated_extern=0xae1feff2) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1028
      #12 0x810de98b in row_purge (node=0x83591a10, undo_rec=0x835a0020 "", thr=0x835919b8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1206
      #13 0x810deb5e in row_purge_step (thr=0x835919b8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1258
      #14 0x8104dc2f in que_thr_step (thr=0x835919b8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:653
      #15 0x8104deb2 in que_run_threads_low (thr=0x835919b8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:709
      #16 0x8104dfd3 in que_run_threads (thr=0x835919b8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:729
      #17 0x81121af6 in srv_task_execute () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1716
      #18 0x811221d2 in purge_worker_callback () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1960
      #19 0x813a1107 in tpool::task_group::execute (this=0x8281b640 <purge_task_group>, t=0x8281b3c0 <purge_worker_task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task_group.cc:55
      #20 0x813a14bb in tpool::task::execute (this=0x8281b3c0 <purge_worker_task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task.cc:32
      #21 0x81399993 in tpool::thread_pool_generic::worker_main (this=0x833f93d8, thread_var=0x834d37e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:549
      #22 0x813a0f17 in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const (this=0xaf600660, __object=0x833f93d8) at /usr/include/c++/5/functional:600
      #23 0x813a0ea8 in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>) (this=0xaf600658) at /usr/include/c++/5/functional:1531
      #24 0x813a0d0d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0xaf600658) at /usr/include/c++/5/functional:1520
      #25 0x813a0c94 in std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0xaf60064c) at /usr/include/c++/5/thread:115
      #26 0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #27 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #28 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 4 (Thread 0xaf5ffb40 (LWP 5152)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d7bb7 in syscall () from /lib/i386-linux-gnu/libc.so.6
      #2  0x8112fa7e in srw_mutex_impl<false>::wait (this=0x81dde044 <dict_sys+68>, lk=2147483654) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:348
      #3  0x8112eb3c in srw_mutex_impl<false>::wait_and_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:461
      #4  0x80f22fb8 in srw_mutex_impl<false>::wr_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:80
      #5  0x8112f5f4 in ssux_lock_impl<false>::rd_wait (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:523
      #6  0x81097f38 in ssux_lock_impl<false>::rd_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:214
      #7  0x8112f6a7 in srw_lock_impl<false>::psi_rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:581
      #8  0x81133c1d in srw_lock_impl<false>::rd_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:481
      #9  0x8122b433 in dict_sys_t::freeze (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=834) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:997
      #10 0x8122a772 in dict_table_open_on_id (table_id=2, dict_locked=false, table_op=DICT_TABLE_OP_NORMAL, thd=0x83666f10, mdl=0x8359197c) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:834
      #11 0x810ddf83 in row_purge_parse_undo_rec (node=0x83591880, undo_rec=0x8359fff0 "", thr=0x83591828, updated_extern=0xaf5feff2) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1028
      #12 0x810de98b in row_purge (node=0x83591880, undo_rec=0x8359fff0 "", thr=0x83591828) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1206
      #13 0x810deb5e in row_purge_step (thr=0x83591828) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/row/row0purge.cc:1258
      #14 0x8104dc2f in que_thr_step (thr=0x83591828) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:653
      #15 0x8104deb2 in que_run_threads_low (thr=0x83591828) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:709
      #16 0x8104dfd3 in que_run_threads (thr=0x83591828) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/que/que0que.cc:729
      #17 0x81121af6 in srv_task_execute () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1716
      #18 0x811221d2 in purge_worker_callback () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1960
      #19 0x813a1107 in tpool::task_group::execute (this=0x8281b640 <purge_task_group>, t=0x8281b3c0 <purge_worker_task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task_group.cc:55
      #20 0x813a14bb in tpool::task::execute (this=0x8281b3c0 <purge_worker_task>) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task.cc:32
      #21 0x81399993 in tpool::thread_pool_generic::worker_main (this=0x833f93d8, thread_var=0x834d38e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:549
      #22 0x813a0f17 in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const (this=0xaf600490, __object=0x833f93d8) at /usr/include/c++/5/functional:600
      #23 0x813a0ea8 in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>) (this=0xaf600488) at /usr/include/c++/5/functional:1531
      #24 0x813a0d0d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0xaf600488) at /usr/include/c++/5/functional:1520
      #25 0x813a0c94 in std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0xaf60047c) at /usr/include/c++/5/thread:115
      #26 0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #27 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #28 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 3 (Thread 0xb33c5b40 (LWP 5144)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb73a5e56 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
      #2  0x81337ced in safe_cond_timedwait (cond=0x82828900 <COND_timer>, mp=0x82828880 <LOCK_timer>, abstime=0xb33c5210, file=0x818bc8e4 "/home/buildbot/buildbot/build/mariadb-10.7.1/mysys/my_thr_init.c", line=609) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/thr_mutex.c:548
      #3  0x8133197d in psi_cond_timedwait (that=0x82828900 <COND_timer>, mutex=0x82828880 <LOCK_timer>, abstime=0xb33c5210, file=0x818bd9ec "/home/buildbot/buildbot/build/mariadb-10.7.1/mysys/thr_timer.c", line=321) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/my_thr_init.c:609
      #4  0x81338c0a in inline_mysql_cond_timedwait (that=0x82828900 <COND_timer>, mutex=0x82828880 <LOCK_timer>, abstime=0xb33c5210, src_file=0x818bd9ec "/home/buildbot/buildbot/build/mariadb-10.7.1/mysys/thr_timer.c", src_line=321) at /home/buildbot/buildbot/build/mariadb-10.7.1/include/mysql/psi/mysql_thread.h:1086
      #5  0x813398f4 in timer_handler (arg=0x0) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/thr_timer.c:321
      #6  0x80dabb5d in pfs_spawn_thread (arg=0x834253b8) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/perfschema/pfs.cc:2201
      #7  0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #8  0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 2 (Thread 0xad1fdb40 (LWP 5156)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb70d7bb7 in syscall () from /lib/i386-linux-gnu/libc.so.6
      #2  0x8112fa7e in srw_mutex_impl<false>::wait (this=0x81dde044 <dict_sys+68>, lk=2147483651) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:348
      #3  0x8112eb3c in srw_mutex_impl<false>::wait_and_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:461
      #4  0x80f22fb8 in srw_mutex_impl<false>::wr_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:80
      #5  0x80f1f714 in ssux_lock_impl<false>::wr_lock (this=0x81dde044 <dict_sys+68>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:224
      #6  0x8112f76d in srw_lock_impl<false>::psi_wr_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=1310) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/sync/srw_lock.cc:598
      #7  0x810014f9 in srw_lock_impl<false>::wr_lock (this=0x81dde040 <dict_sys+64>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=1310) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/srw_lock.h:494
      #8  0x8122b178 in dict_sys_t::lock_wait (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=1310) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:980
      #9  0x80f19c25 in dict_sys_t::lock (this=0x81dde000 <dict_sys>, file=0x818651e0 "/home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc", line=1310) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/include/dict0dict.h:1568
      #10 0x8122c7bd in dict_sys_t::evict_table_LRU (this=0x81dde000 <dict_sys>, half=false) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/dict/dict0dict.cc:1310
      #11 0x811211a9 in srv_master_do_idle_tasks (counter_time=4644927963) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1605
      #12 0x8112171a in srv_master_callback () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1663
      #13 0x8139b4a0 in tpool::thread_pool_generic::timer_generic::run (this=0x835afc68) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:313
      #14 0x8139b5ce in tpool::thread_pool_generic::timer_generic::execute (arg=0x835afc68) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:332
      #15 0x813a14d2 in tpool::task::execute (this=0x835afc90) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task.cc:37
      #16 0x81399993 in tpool::thread_pool_generic::worker_main (this=0x833f93d8, thread_var=0x834d36e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:549
      #17 0x813a0f17 in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const (this=0xaf600830, __object=0x833f93d8) at /usr/include/c++/5/functional:600
      #18 0x813a0ea8 in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>) (this=0xaf600828) at /usr/include/c++/5/functional:1531
      #19 0x813a0d0d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0xaf600828) at /usr/include/c++/5/functional:1520
      #20 0x813a0c94 in std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0xaf60081c) at /usr/include/c++/5/thread:115
      #21 0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #22 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #23 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
       
      Thread 1 (Thread 0xac1fbb40 (LWP 5158)):
      #0  0xb77a1c31 in __kernel_vsyscall ()
      #1  0xb73a6ce1 in pthread_kill () from /lib/i386-linux-gnu/libpthread.so.0
      #2  0x8133324e in my_write_core (sig=6) at /home/buildbot/buildbot/build/mariadb-10.7.1/mysys/stacktrace.c:424
      #3  0x80aa6fc6 in handle_fatal_signal (sig=6) at /home/buildbot/buildbot/build/mariadb-10.7.1/sql/signal_handler.cc:345
      #4  <signal handler called>
      #5  0xb77a1c31 in __kernel_vsyscall ()
      #6  0xb7020e89 in raise () from /lib/i386-linux-gnu/libc.so.6
      #7  0xb70223e7 in abort () from /lib/i386-linux-gnu/libc.so.6
      #8  0x81177fb8 in ib::fatal::~fatal (this=0xac1fb004, __in_chrg=<optimized out>) at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/ut/ut0ut.cc:519
      #9  0x8111fd4f in srv_monitor_task () at /home/buildbot/buildbot/build/mariadb-10.7.1/storage/innobase/srv/srv0srv.cc:1317
      #10 0x8139b4a0 in tpool::thread_pool_generic::timer_generic::run (this=0x835abb78) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:313
      #11 0x8139b5ce in tpool::thread_pool_generic::timer_generic::execute (arg=0x835abb78) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:332
      #12 0x813a14d2 in tpool::task::execute (this=0x835abba0) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/task.cc:37
      #13 0x81399993 in tpool::thread_pool_generic::worker_main (this=0x833f93d8, thread_var=0x834d35e8) at /home/buildbot/buildbot/build/mariadb-10.7.1/tpool/tpool_generic.cc:549
      #14 0x813a0f17 in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::worker_data*, void>(tpool::thread_pool_generic*, tpool::worker_data*&&) const (this=0xaf600a00, __object=0x833f93d8) at /usr/include/c++/5/functional:600
      #15 0x813a0ea8 in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0u, 1u>(std::_Index_tuple<0u, 1u>) (this=0xaf6009f8) at /usr/include/c++/5/functional:1531
      #16 0x813a0d0d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0xaf6009f8) at /usr/include/c++/5/functional:1520
      #17 0x813a0c94 in std::thread::_Impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0xaf6009ec) at /usr/include/c++/5/thread:115
      #18 0xb72bb5de in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
      #19 0xb73a02b5 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
      #20 0xb70dc16e in clone () from /lib/i386-linux-gnu/libc.so.6
      

      10.6 https://buildbot.askmonty.org/buildbot/builders/kvm-asan/builds/6875/steps/mtr_nm/logs/stdio

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              Assignee:
              marko Marko Mäkelä
              Reporter:
              alice Alice Sherepa
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