Server crashes in Explain_union::print_explain on ER_TOO_BIG_SELECT with explain in slow log

CREATE TABLE t1 (i INT) ENGINE=MyISAM;

INSERT INTO t1 VALUES

(1),(2),(3),(4),(5),(6),(7),(8),(9),(10);

SET max_join_size = 10;

SET log_slow_verbosity = 'explain';

SET long_query_time = 0.000001;

--error ER_TOO_BIG_SELECT

( SELECT ta.* FROM t1 ta, t1 tb ) UNION ( SELECT * FROM t1 );

SELECT 'Checking that server is still alive';

#3  <signal handler called>

#4  0x0000000000765271 in Explain_union::print_explain (this=0x7f516402cbe8, query=0x7f5164013110, output=0x7f516c3dabf0, explain_flags=0 '\000') at 10.0-base-explain-slowquerylog/sql/sql_explain.cc:168

#5  0x0000000000764fcd in Explain_query::print_explain (this=0x7f5164013110, output=0x7f516c3dabf0, explain_flags=0 '\000') at 10.0-base-explain-slowquerylog/sql/sql_explain.cc:121

#6  0x0000000000765095 in Explain_query::print_explain_str (this=0x7f5164013110, thd=0x21c7690, out_str=0x7f516c3dad70) at 10.0-base-explain-slowquerylog/sql/sql_explain.cc:139

#7  0x0000000000765001 in print_explain_query (lex=0x21cab48, thd=0x21c7690, str=0x7f516c3dad70) at 10.0-base-explain-slowquerylog/sql/sql_explain.cc:128

#8  0x00000000008c34f5 in MYSQL_QUERY_LOG::write (this=0x1f6d230, thd=0x21c7690, current_time=1381146510, user_host=0x7f516c3db210 "root[root] @ localhost []", user_host_len=25, query_utime=4568, lock_utime=2078, is_command=false, sql_text=0x7f51640114c8 "( SELECT ta.* FROM t1 ta, t1 tb ) UNION ( SELECT * FROM t1 )", sql_text_len=60) at 10.0-base-explain-slowquerylog/sql/log.cc:2833

#9  0x00000000008be690 in Log_to_file_event_handler::log_slow (this=0x1f6cce0, thd=0x21c7690, current_time=..., user_host=0x7f516c3db210 "root[root] @ localhost []", user_host_len=25, query_utime=4568, lock_utime=2078, is_command=false, sql_text=0x7f51640114c8 "( SELECT ta.* FROM t1 ta, t1 tb ) UNION ( SELECT * FROM t1 )", sql_text_len=60) at 10.0-base-explain-slowquerylog/sql/log.cc:996

#10 0x00000000008bf167 in LOGGER::slow_log_print (this=0x154ab80, thd=0x21c7690, query=0x7f51640114c8 "( SELECT ta.* FROM t1 ta, t1 tb ) UNION ( SELECT * FROM t1 )", query_length=60, current_utime=240579461470) at 10.0-base-explain-slowquerylog/sql/log.cc:1287

#11 0x00000000008cb4ad in slow_log_print (thd=0x21c7690, query=0x7f51640114c8 "( SELECT ta.* FROM t1 ta, t1 tb ) UNION ( SELECT * FROM t1 )", query_length=60, current_utime=240579461470) at 10.0-base-explain-slowquerylog/sql/log.cc:5870

#12 0x000000000061c7df in log_slow_statement (thd=0x21c7690) at 10.0-base-explain-slowquerylog/sql/sql_parse.cc:1572

#13 0x000000000061c483 in dispatch_command (command=COM_QUERY, thd=0x21c7690, packet=0x21cc341 "", packet_length=60) at 10.0-base-explain-slowquerylog/sql/sql_parse.cc:1495

#14 0x000000000061a441 in do_command (thd=0x21c7690) at 10.0-base-explain-slowquerylog/sql/sql_parse.cc:812

#15 0x0000000000734e6d in do_handle_one_connection (thd_arg=0x21c7690) at 10.0-base-explain-slowquerylog/sql/sql_connect.cc:1266

#16 0x0000000000734bdb in handle_one_connection (arg=0x21c7690) at 10.0-base-explain-slowquerylog/sql/sql_connect.cc:1181

#17 0x0000000000998862 in pfs_spawn_thread (arg=0x21c2a70) at 10.0-base-explain-slowquerylog/storage/perfschema/pfs.cc:1015

#18 0x00007f5170ac8e9a in start_thread (arg=0x7f516c3dc700) at pthread_create.c:308

#19 0x00007f516fdbccbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

bzr version-info

revision-id: psergey@askmonty.org-20131005091945-lphh0ek2w8oiotzu

revno: 3706

branch-nick: 10.0-base-explain-slowquerylog