[MDEV-19198] Assertion `(create_info->tmp_table()) || thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db.str, table->table_name.str, MDL_EXCLUSIVE)' failed in mysql_create_like_table Created: 2019-04-06  Updated: 2021-05-19  Resolved: 2021-04-28

Status: Closed
Project: MariaDB Server
Component/s: Debug, Locking
Affects Version/s: 5.5, 10.0, 10.1, 10.2, 10.3, 10.4, 10.5
Fix Version/s: 10.2.38, 10.3.29, 10.4.19, 10.5.10, 10.6.1

Type: Bug Priority: Critical
Reporter: Elena Stepanova Assignee: Vladislav Vaintroub
Resolution: Fixed Votes: 0
Labels: affects-tests, upstream-5.5

Issue Links:
Blocks

 Description    

CREATE TABLE t1 (a INT);
 
CREATE TABLE t2 (b INT);
 
CREATE VIEW v2 AS SELECT * FROM t2 ;
 
 
 
LOCK TABLES t1 WRITE, v2 WRITE;
 
CREATE TABLE IF NOT EXISTS t1 LIKE t2;
 
 
 
# Cleanup
 
UNLOCK TABLES;
 
DROP VIEW v2;
 
DROP TABLE t1, t2;

10.4 a2e477ff

 
mysqld: /data/src/10.4/sql/sql_table.cc:5723: bool mysql_create_like_table(THD*, TABLE_LIST*, TABLE_LIST*, Table_specification_st*): Assertion `(create_info->tmp_table()) || thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db.str, table->table_name.str, MDL_EXCLUSIVE)' failed.
 
190406 13:33:08 [ERROR] mysqld got signal 6 ;
 
 
 
#7  0x00007fd201d73ee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
 
#8  0x0000562bc1f80412 in mysql_create_like_table (thd=0x7fd1e0000b00, table=0x7fd1e00156e0, src_table=0x7fd1e0015dc8, create_info=0x7fd1fc6ed910) at /data/src/10.4/sql/sql_table.cc:5720
 
#9  0x0000562bc1ea3d66 in mysql_execute_command (thd=0x7fd1e0000b00) at /data/src/10.4/sql/sql_parse.cc:4376
 
#10 0x0000562bc1eb1171 in mysql_parse (thd=0x7fd1e0000b00, rawbuf=0x7fd1e00155e8 "CREATE TABLE IF NOT EXISTS t1 LIKE t2", length=37, parser_state=0x7fd1fc6ee180, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:8154
 
#11 0x0000562bc1e9cbc8 in dispatch_command (command=COM_QUERY, thd=0x7fd1e0000b00, packet=0x7fd1e000a8a1 "CREATE TABLE IF NOT EXISTS t1 LIKE t2", packet_length=37, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:1832
 
#12 0x0000562bc1e9b3ae in do_command (thd=0x7fd1e0000b00) at /data/src/10.4/sql/sql_parse.cc:1365
 
#13 0x0000562bc20137a5 in do_handle_one_connection (connect=0x562bc5aab520) at /data/src/10.4/sql/sql_connect.cc:1398
 
#14 0x0000562bc2013516 in handle_one_connection (arg=0x562bc5aab520) at /data/src/10.4/sql/sql_connect.cc:1301
 
#15 0x0000562bc2507995 in pfs_spawn_thread (arg=0x562bc5b9d8f0) at /data/src/10.4/storage/perfschema/pfs.cc:1862
 
#16 0x00007fd203c62494 in start_thread (arg=0x7fd1fc6ef700) at pthread_create.c:333
 
#17 0x00007fd201e3093f in clone () from /lib/x86_64-linux-gnu/libc.so.6

Slightly different on 10.1-10.2:

10.2 b4a7bde76

 
mysqld: /data/src/10.2/sql/sql_table.cc:5516: bool mysql_create_like_table(THD*, TABLE_LIST*, TABLE_LIST*, Table_specification_st*): Assertion `(create_info->tmp_table()) || thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db, table->table_name, MDL_EXCLUSIVE)' failed.
 
190406 13:35:10 [ERROR] mysqld got signal 6 ;

Yet slightly different on 5.5:

5.5 370886a9

 
mysqld: /data/src/5.5/sql/sql_table.cc:4887: bool mysql_create_like_table(THD*, TABLE_LIST*, TABLE_LIST*, HA_CREATE_INFO*): Assertion `(create_info->options & 1) || thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db, table->table_name, MDL_EXCLUSIVE)' failed.

No obvious problem on a non-debug build.

 Comments   
Comment by Roel Van de Paar [ 2020-08-20 ]

Ran into this one also. Similar testcase

USE test;
 
CREATE TABLE t1 (c INT);
 
CREATE TABLE t2 (c INT);
 
LOCK TABLES t1 WRITE,t2 WRITE;
 
CREATE TABLE IF NOT EXISTS t1 LIKE t2;

Leads to:

10.4.15 eae968f62d285de97ed607c87bc131cd863d5d03 (Debug)

 
mysqld: /test/10.4_dbg/sql/sql_table.cc:5781: bool mysql_create_like_table(THD*, TABLE_LIST*, TABLE_LIST*, Table_specification_st*): Assertion `(create_info->tmp_table()) || thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db.str, table->table_name.str, MDL_EXCLUSIVE)' failed.

10.4.15 eae968f62d285de97ed607c87bc131cd863d5d03 (Debug)

 
Core was generated by `/test/MD110820-mariadb-10.4.15-linux-x86_64-dbg/bin/mysqld --no-defaults --core'.
 
Program terminated with signal SIGABRT, Aborted.
 
#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6)
 
    at ../sysdeps/unix/sysv/linux/pthread_kill.c:57
 
[Current thread is 1 (Thread 0x14a83ee5b700 (LWP 3970272))]
 
(gdb) bt
 
#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:57
 
#1  0x000055b7470998a6 in my_write_core (sig=sig@entry=6) at /test/10.4_dbg/mysys/stacktrace.c:482
 
#2  0x000055b746815cdc in handle_fatal_signal (sig=6) at /test/10.4_dbg/sql/signal_handler.cc:343
 
#3  <signal handler called>
 
#4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
 
#5  0x000014a83d0f28b1 in __GI_abort () at abort.c:79
 
#6  0x000014a83d0e242a in __assert_fail_base (fmt=0x14a83d269a38 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x55b7471a8f18 "(create_info->tmp_table()) || thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db.str, table->table_name.str, MDL_EXCLUSIVE)", file=file@entry=0x55b7471a8028 "/test/10.4_dbg/sql/sql_table.cc", line=line@entry=5781, function=function@entry=0x55b7471aa7c0 <mysql_create_like_table(THD*, TABLE_LIST*, TABLE_LIST*, Table_specification_st*)::__PRETTY_FUNCTION__> "bool mysql_create_like_table(THD*, TABLE_LIST*, TABLE_LIST*, Table_specification_st*)") at assert.c:92
 
#7  0x000014a83d0e24a2 in __GI___assert_fail (assertion=assertion@entry=0x55b7471a8f18 "(create_info->tmp_table()) || thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db.str, table->table_name.str, MDL_EXCLUSIVE)", file=file@entry=0x55b7471a8028 "/test/10.4_dbg/sql/sql_table.cc", line=line@entry=5781, function=function@entry=0x55b7471aa7c0 <mysql_create_like_table(THD*, TABLE_LIST*, TABLE_LIST*, Table_specification_st*)::__PRETTY_FUNCTION__> "bool mysql_create_like_table(THD*, TABLE_LIST*, TABLE_LIST*, Table_specification_st*)") at assert.c:101
 
#8  0x000055b746627575 in mysql_create_like_table (thd=thd@entry=0x14a816c15070, table=table@entry=0x14a816c6d198, src_table=src_table@entry=0x14a816c6d898, create_info=create_info@entry=0x14a83ee58010) at /test/10.4_dbg/sql/sql_table.cc:5778
 
#9  0x000055b74662824b in Sql_cmd_create_table_like::execute (this=0x14a816c6d138, thd=0x14a816c15070) at /test/10.4_dbg/sql/sql_table.cc:11469
 
#10 0x000055b74656aa3d in mysql_execute_command (thd=thd@entry=0x14a816c15070) at /test/10.4_dbg/sql/sql_parse.cc:6098
 
#11 0x000055b74656d090 in mysql_parse (thd=thd@entry=0x14a816c15070, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x14a83ee5a460, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.4_dbg/sql/sql_parse.cc:7896
 
#12 0x000055b74656f920 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x14a816c15070, packet=packet@entry=0x14a816c57071 "CREATE TABLE IF NOT EXISTS t1 LIKE t2", packet_length=packet_length@entry=37, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.4_dbg/sql/sql_parse.cc:1834
 
#13 0x000055b74657335b in do_command (thd=0x14a816c15070) at /test/10.4_dbg/sql/sql_parse.cc:1352
 
#14 0x000055b74669f8b6 in do_handle_one_connection (connect=connect@entry=0x14a83bc35790) at /test/10.4_dbg/sql/sql_connect.cc:1412
 
#15 0x000055b74669f9d6 in handle_one_connection (arg=0x14a83bc35790) at /test/10.4_dbg/sql/sql_connect.cc:1316
 
#16 0x000014a83e0596db in start_thread (arg=0x14a83ee5b700) at pthread_create.c:463
 
#17 0x000014a83d1d3a3f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Bug confirmed present in:
MariaDB: 10.1.47 (dbg), 10.2.34 (dbg), 10.3.25 (dbg), 10.4.15 (dbg), 10.5.6 (dbg)
MySQL: 5.5.62 (dbg)

Bug confirmed not present in:
MariaDB: 10.1.47 (opt), 10.2.34 (opt), 10.3.25 (opt), 10.4.15 (opt), 10.5.6 (opt)
MySQL: 5.5.62 (opt), 5.6.47 (dbg), 5.6.47 (opt), 5.7.29 (dbg), 5.7.29 (opt), 8.0.19 (dbg), 8.0.19 (opt)

Comment by Michael Widenius [ 2021-04-29 ]

Made a simpler fix in 10.6 for this bug.

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