2020-04-14 10:14:49 0 [Note] /ten1/builds/10.5-87a7968c-deb/bin/mysqld (initiated by: root[root] @ localhost [127.0.0.1]): Normal shutdown

2020-04-14 10:14:49 0 [Note] Event Scheduler: Purging the queue. 14 events

safe_mutex: Trying to lock uninitialized mutex at /home/elenst/src/10.5/sql/rpl_parallel.cc, line 470

200414 10:14:49 [ERROR] mysqld got signal 6 ;

#3  <signal handler called>

#4  0x00007f73a1ad5207 in raise () from /lib64/libc.so.6

#5  0x00007f73a1ad68f8 in abort () from /lib64/libc.so.6

#6  0x0000560ad0f8b4cf in safe_mutex_lock (mp=0x560ad1f58d90 <global_rpl_thread_pool+16>, my_flags=0, file=0x560ad11aaf40 "/home/elenst/src/10.5/sql/rpl_parallel.cc", line=470) at /home/elenst/src/10.5/mysys/thr_mutex.c:244

#7  0x0000560ad05107d1 in inline_mysql_mutex_lock (that=0x560ad1f58d90 <global_rpl_thread_pool+16>, src_file=0x560ad11aaf40 "/home/elenst/src/10.5/sql/rpl_parallel.cc", src_line=470) at /home/elenst/src/10.5/include/mysql/psi/mysql_thread.h:763

#8  0x0000560ad051229d in pool_mark_busy (pool=0x560ad1f58d80 <global_rpl_thread_pool>, thd=0x7f7328000b18) at /home/elenst/src/10.5/sql/rpl_parallel.cc:470

#9  0x0000560ad05126f2 in rpl_pause_for_ftwrl (thd=0x7f7328000b18) at /home/elenst/src/10.5/sql/rpl_parallel.cc:563

#10 0x0000560ad02eb534 in mysql_execute_command (thd=0x7f7328000b18) at /home/elenst/src/10.5/sql/sql_parse.cc:5374

#11 0x0000560ad02f3912 in mysql_parse (thd=0x7f7328000b18, rawbuf=0x7f7328012460 "FLUSH /* QNO 1411 CON_ID 9 */ TABLES WITH READ LOCK", length=51, parser_state=0x7f7384acf520, is_com_multi=false, is_next_command=false) at /home/elenst/src/10.5/sql/sql_parse.cc:7953

#12 0x0000560ad02df2c0 in dispatch_command (command=COM_QUERY, thd=0x7f7328000b18, packet=0x7f7328008809 "FLUSH /* QNO 1411 CON_ID 9 */ TABLES WITH READ LOCK", packet_length=51, is_com_multi=false, is_next_command=false) at /home/elenst/src/10.5/sql/sql_parse.cc:1840

#13 0x0000560ad02dd93c in do_command (thd=0x7f7328000b18) at /home/elenst/src/10.5/sql/sql_parse.cc:1359

#14 0x0000560ad0483c6d in do_handle_one_connection (connect=0x560ad51db8f8, put_in_cache=true) at /home/elenst/src/10.5/sql/sql_connect.cc:1422

#15 0x0000560ad0483986 in handle_one_connection (arg=0x560ad51db8f8) at /home/elenst/src/10.5/sql/sql_connect.cc:1319

#16 0x0000560ad09c173e in pfs_spawn_thread (arg=0x560ad52f7448) at /home/elenst/src/10.5/storage/perfschema/pfs.cc:2201

#17 0x00007f73a310bdd5 in start_thread () from /lib64/libpthread.so.0

#18 0x00007f73a1b9cead in clone () from /lib64/libc.so.6

index 9344312fe62..e42e6b2ebb5 100644

--- a/sql/rpl_parallel.cc

+++ b/sql/rpl_parallel.cc

@@ -467,6 +467,7 @@ pool_mark_busy(rpl_parallel_thread_pool *pool, THD *thd)

     So we protect the infrequent operations of FLUSH TABLES WITH READ LOCK and

     pool size changes with this condition wait.

   */

+  DBUG_EXECUTE_IF("sleep_mark_busy",my_sleep(1000000););

   mysql_mutex_lock(&pool->LOCK_rpl_thread_pool);

   if (thd)

   {

--connect (con1,localhost,root,,)

SET DEBUG_DBUG='+d,sleep_mark_busy';

--send

  FLUSH TABLES WITH READ LOCK;

--connection default

--source include/restart_mysqld.inc