Comment 0 for bug 1506697

This bug occurs many times in the first iteration of PS 5.7 debug.

The issue is somewhat complex;
- These crashes were not seen in a similar fashion in regular 5.6 testing.
- It happens on 5.7 debug but not on optimized.
- It does not happen on MS 5.7.8 in either debug or opt
- 'Assertion `0' failed.' is a very generic error which happens whenever there is an unknown response from the client, and thus can have many causes
- No initial connection with PS bug 1168265
- This bug was seen 320 times in the PS 5.7 alpha run

Initial example testcase:
DROP DATABASE test;CREATE DATABASE test;USE test;
SELECT('a%b' LIKE 'ax%b' ESCAPE (0,0));

Results on various versions:

$ ~/percona-qa/multi_tester.sh /sda/002215/1001/pquery_thread-0.sql_out
======= PS-5.7-OPT (5.7)
ERROR 1241 (21000) at line 2: Operand should contain 1 column(s)
======= PS-5.7-DBG (5.7)
ERROR 2013 (HY000) at line 2: Lost connection to MySQL server during query
======= MS-5.7-OPT (5.7.8)
ERROR 1241 (21000) at line 2: Operand should contain 1 column(s)
======= MS-5.7-DBG (5.7.8)
ERROR 1241 (21000) at line 2: Operand should contain 1 column(s)
======= PS-5.6-DBG (5.6.25)
ERROR 2013 (HY000) at line 2: Lost connection to MySQL server during query
======= MS-5.6-DBG (5.6.23)
ERROR 2013 (HY000) at line 2: Lost connection to MySQL server during query

From PS-5.7-DBG (alpha):

+bt
#0 0x00007ffdd56fa771 in __pthread_kill (threadid=<optimized out>, signo=6) at ../nptl/sysdeps/unix/sysv/linux/pthread_kill.c:61
#1 0x0000000000ab0686 in my_write_core (sig=6) at /git/PS-5.7_dbg/mysys/stacktrace.c:422
#2 0x000000000072dfdf in handle_fatal_signal (sig=6) at /git/PS-5.7_dbg/sql/signal_handler.cc:236
#3 <signal handler called>
#4 0x00007ffdd42fe5d7 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#5 0x00007ffdd42ffcc8 in __GI_abort () at abort.c:90
#6 0x00007ffdd42f7546 in __assert_fail_base (fmt=0x7ffdd4447128 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0xfc823b "0", file=file@entry=0xfc8308 "/git/PS-5.7_dbg/sql/item_row.cc", line=line@entry=87, function=function@entry=0xfc8460 <Item_row::illegal_method_call(char const*)::__PRETTY_FUNCTION__> "void Item_row::illegal_method_call(const char*)") at assert.c:92
#7 0x00007ffdd42f75f2 in __GI___assert_fail (assertion=0xfc823b "0", file=0xfc8308 "/git/PS-5.7_dbg/sql/item_row.cc", line=87, function=0xfc8460 <Item_row::illegal_method_call(char const*)::__PRETTY_FUNCTION__> "void Item_row::illegal_method_call(const char*)") at assert.c:101
#8 0x000000000094347f in Item_row::illegal_method_call (this=0x7ffd2201f3c0, method=0xfc82a5 "val_str") at /git/PS-5.7_dbg/sql/item_row.cc:87
#9 0x0000000000944095 in Item_row::val_str (this=0x7ffd2201f3c0) at /git/PS-5.7_dbg/sql/item_row.h:58
#10 0x000000000068a080 in Item_func_like::fix_fields (this=0x7ffd2201f480, thd=0x7ffd296af000, ref=0x7ffd2201f650) at /git/PS-5.7_dbg/sql/item_cmpfunc.cc:5336
#11 0x0000000000779418 in setup_fields (thd=0x7ffd296af000, ref_pointer_array=..., fields=..., mark_used_columns=MARK_COLUMNS_READ, sum_func_list=0x7ffd2201f990, allow_sum_func=true) at /git/PS-5.7_dbg/sql/sql_base.cc:8482
#12 0x00000000008094e4 in JOIN::prepare (this=0x7ffd2201f748, tables_init=0x0, wild_num=0, conds_init=0x0, og_num=0, order_init=0x0, group_init=0x0, having_init=0x0, select_lex_arg=0x7ffd296b1c60, unit_arg=0x7ffd296b1618) at /git/PS-5.7_dbg/sql/sql_resolver.cc:168
#13 0x0000000000810ec1 in mysql_prepare_select (thd=0x7ffd296af000, tables=0x0, wild_num=0, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, select_options=2147748608, result=0x7ffd2201f720, unit=0x7ffd296b1618, select_lex=0x7ffd296b1c60, free_join=0x7ffdd5cf22d7) at /git/PS-5.7_dbg/sql/sql_select.cc:1054
#14 0x000000000081118f in mysql_select (thd=0x7ffd296af000, tables=0x0, wild_num=0, fields=..., conds=0x0, order=0x7ffd296b1e28, group=0x7ffd296b1d60, having=0x0, select_options=2147748608, result=0x7ffd2201f720, unit=0x7ffd296b1618, select_lex=0x7ffd296b1c60) at /git/PS-5.7_dbg/sql/sql_select.cc:1177
#15 0x000000000080f3e2 in handle_select (thd=0x7ffd296af000, result=0x7ffd2201f720, setup_tables_done_option=0) at /git/PS-5.7_dbg/sql/sql_select.cc:110
#16 0x00000000007e79e2 in execute_sqlcom_select (thd=0x7ffd296af000, all_tables=0x0) at /git/PS-5.7_dbg/sql/sql_parse.cc:5634
#17 0x00000000007dff82 in mysql_execute_command (thd=0x7ffd296af000) at /git/PS-5.7_dbg/sql/sql_parse.cc:2989
#18 0x00000000007ea6e5 in mysql_parse (thd=0x7ffd296af000, rawbuf=0x7ffd2201f010 "SELECT('a%b' LIKE 'ax%b' ESCAPE (0,0))", length=38, parser_state=0x7ffdd5cf3620) at /git/PS-5.7_dbg/sql/sql_parse.cc:6922
#19 0x00000000007dc67d in dispatch_command (command=COM_QUERY, thd=0x7ffd296af000, packet=0x7ffd296c0001 "SELECT('a%b' LIKE 'ax%b' ESCAPE (0,0))", packet_length=38) at /git/PS-5.7_dbg/sql/sql_parse.cc:1434
#20 0x00000000007db5af in do_command (thd=0x7ffd296af000) at /git/PS-5.7_dbg/sql/sql_parse.cc:1051
#21 0x00000000007a3b41 in do_handle_one_connection (thd_arg=0x7ffd296af000) at /git/PS-5.7_dbg/sql/sql_connect.cc:1532
#22 0x00000000007a3649 in handle_one_connection (arg=0x7ffd296af000) at /git/PS-5.7_dbg/sql/sql_connect.cc:1443
#23 0x0000000000b00f8c in pfs_spawn_thread (arg=0x7ffdd3bfe740) at /git/PS-5.7_dbg/storage/perfschema/pfs.cc:1860
#24 0x00007ffdd56f5df5 in start_thread (arg=0x7ffdd5cf4700) at pthread_create.c:308
#25 0x00007ffdd43bf1ad in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113