USE test;

CREATE TABLE t1(a DATETIME);

CREATE TABLE t2(a VARCHAR(20));

SELECT (SELECT CONCAT(a),1 FROM t1) <=> (SELECT CONCAT(a),1 FROM t2);

200822 17:22:32 [ERROR] mysqld got signal 4 ;

Core was generated by `/test/MD110820-mariadb-10.5.6-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=11)

    at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

[Current thread is 1 (Thread 0x14d09f455700 (LWP 1619580))]

(gdb) bt

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=11) at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

#1  0x000055690b534b86 in my_write_core (sig=sig@entry=11) at /test/10.5_dbg/mysys/stacktrace.c:519

#2  0x000055690acebd7b in handle_fatal_signal (sig=11) at /test/10.5_dbg/sql/signal_handler.cc:330

#3  <signal handler called>

#4  0x000055690c151ef0 in typeinfo for Item_func_set_collation ()

#5  0x000055690add6a69 in Item_singlerow_subselect::reset (this=0x14d07b475cd0) at /test/10.5_dbg/sql/item_subselect.cc:1167

#6  0x000055690add6b14 in Item_singlerow_subselect::bring_value (this=0x14d07b475cd0) at /test/10.5_dbg/sql/item_subselect.cc:1350

#7  0x000055690ad33e41 in Arg_comparator::compare_e_row (this=0x14d07b477840) at /test/10.5_dbg/sql/item_cmpfunc.cc:1112

#8  0x000055690ad3608f in Arg_comparator::compare (this=0x14d07b477840) at /test/10.5_dbg/sql/item_cmpfunc.h:102

#9  Item_func_equal::val_int (this=0x14d07b477770) at /test/10.5_dbg/sql/item_cmpfunc.cc:1791

#10 0x000055690ac27925 in Type_handler::Item_send_long (this=<optimized out>, item=0x14d07b477770, protocol=0x14d07b415650, buf=<optimized out>) at /test/10.5_dbg/sql/sql_type.cc:7330

#11 0x000055690ac2f10f in Type_handler_long::Item_send (this=<optimized out>, item=<optimized out>, protocol=<optimized out>, buf=<optimized out>) at /test/10.5_dbg/sql/sql_type.h:5494

#12 0x000055690a94f5c5 in Item::send (this=0x14d07b477770, protocol=0x14d07b415650, buffer=0x14d09f453070) at /test/10.5_dbg/sql/item.h:1060

#13 0x000055690a94c65f in Protocol::send_result_set_row (this=this@entry=0x14d07b415650, row_items=row_items@entry=0x14d07b4742e0) at /test/10.5_dbg/sql/protocol.cc:1092

#14 0x000055690a9df59a in select_send::send_data (this=0x14d07b478378, items=@0x14d07b4742e0: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x14d07b4779b0, last = 0x14d07b4779b0, elements = 1}, <No data fields>}) at /test/10.5_dbg/sql/sql_class.cc:3018

#15 0x000055690aabd36d in select_result_sink::send_data_with_check (sent=0, u=<optimized out>, items=<optimized out>, this=<optimized out>) at /test/10.5_dbg/sql/sql_class.h:5303

#16 JOIN::exec_inner (this=this@entry=0x14d07b4783a0) at /test/10.5_dbg/sql/sql_select.cc:4318

#17 0x000055690aabe14d in JOIN::exec (this=this@entry=0x14d07b4783a0) at /test/10.5_dbg/sql/sql_select.cc:4231

#18 0x000055690aabc449 in mysql_select (thd=thd@entry=0x14d07b415088, tables=<optimized out>, fields=@0x14d07b4742e0: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x14d07b4779b0, last = 0x14d07b4779b0, elements = 1}, <No data fields>}, conds=0x0, og_num=0, order=<optimized out>, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x14d07b478378, unit=0x14d07b4190a0, select_lex=0x14d07b474190) at /test/10.5_dbg/sql/sql_select.cc:4655

#19 0x000055690aabc778 in handle_select (thd=thd@entry=0x14d07b415088, lex=lex@entry=0x14d07b418fd8, result=result@entry=0x14d07b478378, setup_tables_done_option=setup_tables_done_option@entry=0) at /test/10.5_dbg/sql/sql_select.cc:417

#20 0x000055690aa44d72 in execute_sqlcom_select (thd=thd@entry=0x14d07b415088, all_tables=0x14d07b474dd8) at /test/10.5_dbg/sql/sql_parse.cc:6210

#21 0x000055690aa3de46 in mysql_execute_command (thd=thd@entry=0x14d07b415088) at /test/10.5_dbg/sql/sql_parse.cc:3932

#22 0x000055690aa4ad4e in mysql_parse (thd=thd@entry=0x14d07b415088, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x14d09f454350, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.5_dbg/sql/sql_parse.cc:7994

#23 0x000055690aa3777e in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x14d07b415088, packet=packet@entry=0x14d07b467089 "", packet_length=packet_length@entry=68, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.5_dbg/sql/sql_parse.cc:1867

#24 0x000055690aa35f58 in do_command (thd=0x14d07b415088) at /test/10.5_dbg/sql/sql_parse.cc:1348

#25 0x000055690ab92bc9 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x14d07e4d0808, put_in_cache=put_in_cache@entry=true) at /test/10.5_dbg/sql/sql_connect.cc:1410

#26 0x000055690ab932e5 in handle_one_connection (arg=arg@entry=0x14d07e4d0808) at /test/10.5_dbg/sql/sql_connect.cc:1312

#27 0x000055690aff9572 in pfs_spawn_thread (arg=0x14d09c046508) at /test/10.5_dbg/storage/perfschema/pfs.cc:2201

#28 0x000014d09e3ce6db in start_thread (arg=0x14d09f455700) at pthread_create.c:463

#29 0x000014d09d7cca3f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Core was generated by `/test/MD110820-mariadb-10.5.6-linux-x86_64-opt/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=11)

    at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

[Current thread is 1 (Thread 0x14631d1ea700 (LWP 1623877))]

(gdb) bt

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=11) at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

#1  0x0000558683796267 in my_write_core (sig=sig@entry=11) at /test/10.5_opt/mysys/stacktrace.c:519

#2  0x000055868316514a in handle_fatal_signal (sig=11) at /test/10.5_opt/sql/signal_handler.cc:330

#3  <signal handler called>

#4  0x00005586841d0c68 in typeinfo for Item_func_set_collation ()

#5  0x0000558683214243 in Item_singlerow_subselect::reset (this=0x1462f9448c60) at /test/10.5_opt/sql/item_subselect.cc:1167

#6  Item_singlerow_subselect::bring_value (this=0x1462f9448c60) at /test/10.5_opt/sql/item_subselect.cc:1350

#7  0x0000558683196c9f in Arg_comparator::compare_e_row (this=0x1462f944a7d0) at /test/10.5_opt/sql/item_cmpfunc.cc:1112

#8  0x0000558683196e7b in Arg_comparator::compare (this=<optimized out>) at /test/10.5_opt/sql/item_cmpfunc.h:102

#9  Item_func_equal::val_int (this=<optimized out>) at /test/10.5_opt/sql/item_cmpfunc.cc:1791

#10 0x00005586830cb869 in Type_handler::Item_send_long (this=<optimized out>, item=0x1462f944a700, protocol=0x1462f9412558, buf=<optimized out>) at /test/10.5_opt/sql/sql_type.cc:7330

#11 0x0000558682eb5d28 in Protocol::send_result_set_row (this=this@entry=0x1462f9412558, row_items=row_items@entry=0x1462f9447270) at /test/10.5_opt/sql/protocol.cc:1092

#12 0x0000558682f236f2 in select_send::send_data (this=0x1462f944b308, items=@0x1462f9447270: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x1462f944a940, last = 0x1462f944a940, elements = 1}, <No data fields>}) at /test/10.5_opt/sql/sql_class.cc:3018

#13 0x0000558682fcc6e2 in select_result_sink::send_data_with_check (sent=0, u=<optimized out>, items=<optimized out>, this=<optimized out>) at /test/10.5_opt/sql/sql_class.h:5300

#14 JOIN::exec_inner (this=this@entry=0x1462f944b330) at /test/10.5_opt/sql/sql_select.cc:4318

#15 0x0000558682fcc877 in JOIN::exec (this=this@entry=0x1462f944b330) at /test/10.5_opt/sql/sql_select.cc:4231

#16 0x0000558682fcaba2 in mysql_select (thd=thd@entry=0x1462f9412018, tables=0x0, fields=@0x1462f9447270: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x1462f944a940, last = 0x1462f944a940, elements = 1}, <No data fields>}, conds=0x0, og_num=<optimized out>, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x1462f944b308, unit=0x1462f9415e70, select_lex=0x1462f9447120) at /test/10.5_opt/sql/sql_select.cc:4655

#17 0x0000558682fcb561 in handle_select (thd=thd@entry=0x1462f9412018, lex=lex@entry=0x1462f9415da8, result=result@entry=0x1462f944b308, setup_tables_done_option=setup_tables_done_option@entry=0) at /test/10.5_opt/sql/sql_select.cc:417

#18 0x0000558682f71b81 in execute_sqlcom_select (thd=thd@entry=0x1462f9412018, all_tables=0x1462f9447d68) at /test/10.5_opt/sql/sql_parse.cc:6210

#19 0x0000558682f6e251 in mysql_execute_command (thd=thd@entry=0x1462f9412018) at /test/10.5_opt/sql/sql_parse.cc:3932

#20 0x0000558682f74cbc in mysql_parse (thd=0x1462f9412018, rawbuf=<optimized out>, length=68, parser_state=0x14631d1e9430, is_com_multi=<optimized out>, is_next_command=<optimized out>) at /test/10.5_opt/sql/sql_parse.cc:7994

#21 0x0000558682f69f85 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x1462f9412018, packet=packet@entry=0x1462f943a019 "", packet_length=packet_length@entry=68, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.5_opt/sql/sql_parse.cc:1867

#22 0x0000558682f682b4 in do_command (thd=0x1462f9412018) at /test/10.5_opt/sql/sql_parse.cc:1348

#23 0x000055868305e001 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x14631a0338f8, put_in_cache=put_in_cache@entry=true) at /test/10.5_opt/sql/sql_connect.cc:1410

#24 0x000055868305e364 in handle_one_connection (arg=arg@entry=0x14631a0338f8) at /test/10.5_opt/sql/sql_connect.cc:1312

#25 0x00005586833cf5da in pfs_spawn_thread (arg=0x14631a04f218) at /test/10.5_opt/storage/perfschema/pfs.cc:2201

#26 0x000014631c1636db in start_thread (arg=0x14631d1ea700) at pthread_create.c:463

#27 0x000014631b561a3f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

10.2.34>USE test;

Database changed

10.2.34>CREATE TABLE t1(a DATETIME);

Query OK, 0 rows affected (0.03 sec)

10.2.34>CREATE TABLE t2(a VARCHAR(20));

Query OK, 0 rows affected (0.01 sec)

10.2.34>SELECT (SELECT CONCAT(a),1 FROM t1) <=> (SELECT CONCAT(a),1 FROM t2);

+---------------------------------------------------------------+

| (SELECT CONCAT(a),1 FROM t1) <=> (SELECT CONCAT(a),1 FROM t2) |

+---------------------------------------------------------------+

|                                                             1 |

+---------------------------------------------------------------+

1 row in set (0.00 sec)