Locking is broken if CREATE OR REPLACE fails under LOCK TABLES

--source include/have_innodb.inc

CREATE TABLE A (pk INT PRIMARY KEY) ENGINE=INNODB;

CREATE OR REPLACE TABLE t7 (a INT PRIMARY KEY REFERENCES A (pk)) ENGINE = INNODB;

LOCK TABLES t7 write, `A` write;

--error ER_DUP_FIELDNAME

CREATE OR REPLACE TABLE t7 (c1 INT NOT NULL, c1 VARCHAR(255) ) ENGINE = INNODB;

UNLOCK TABLES;

DROP TABLE t7, A;

At line 12: query 'UNLOCK TABLES' failed: <Unknown> (2013): Lost connection to server during query

Server version: 10.10.0-MariaDB-debug-log

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=1

max_threads=153

thread_count=1

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 63948 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7effc0000db8

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 = 0x7efff804ed78 thread_stack 0x49000

mysys/stacktrace.c:212(my_print_stacktrace)[0x560fe05dc2e9]

sql/signal_handler.cc:226(handle_fatal_signal)[0x560fdfc9fb6f]

addr2line: DWARF error: section .debug_info is larger than its filesize! (0x5b4757 vs 0x429c68)

??:0(__sigaction)[0x7efffd9c5520]

??:0(pthread_kill)[0x7efffda19828]

??:0(raise)[0x7efffd9c5476]

??:0(abort)[0x7efffd9ab7b7]

/lib/x86_64-linux-gnu/libc.so.6(+0x286db)[0x7efffd9ab6db]

??:0(__assert_fail)[0x7efffd9bce26]

sql/table_cache.cc:443(tc_release_table(TABLE*))[0x560fdfbbeaba]

sql/sql_base.cc:1000(close_thread_table(THD*, TABLE**))[0x560fdf801f48]

sql/sql_base.cc:941(close_thread_tables(THD*))[0x560fdf801b5e]

sql/sql_base.cc:2551(Locked_tables_list::unlock_locked_tables(THD*))[0x560fdf805892]

sql/sql_parse.cc:5063(mysql_execute_command(THD*, bool))[0x560fdf8c501f]

sql/sql_parse.cc:8038(mysql_parse(THD*, char*, unsigned int, Parser_state*))[0x560fdf8cef36]

sql/sql_parse.cc:1896(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool))[0x560fdf8babb1]

sql/sql_parse.cc:1407(do_command(THD*, bool))[0x560fdf8b9521]

sql/sql_connect.cc:1418(do_handle_one_connection(CONNECT*, bool))[0x560fdfaa0a89]

sql/sql_connect.cc:1314(handle_one_connection)[0x560fdfaa0716]

perfschema/pfs.cc:2203(pfs_spawn_thread)[0x560fe0017eec]

addr2line: DWARF error: section .debug_info is larger than its filesize! (0x5b4757 vs 0x429c68)

??:0(pthread_condattr_setpshared)[0x7efffda17947]

??:0(clone)[0x7efffdaa7a44]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x7effc0015570): UNLOCK TABLES