Server crashes in key_copy with join_cache_level > 2 and join on BIT fields

CREATE TABLE t1 (b1 BIT NOT NULL);

INSERT INTO t1 VALUES (0),(1);

CREATE TABLE t2 (b2 BIT NOT NULL);

INSERT INTO t2 VALUES (0),(1);

SET SESSION JOIN_CACHE_LEVEL = 3;

SELECT * FROM t1 LEFT JOIN t2 ON b1 = b2;

#3  <signal handler called>

#4  0x00000000008696bc in key_copy (to_key=0x7f3fddc94009 "\245\245\245\245\245\245\245\020", from_record=0x7f3fddc83a78 "\375\245\245\245\245\245\245\245\377\245\245\245\245\245\245\245\230:\310\335?\177", key_info=0x7f3fddc93b68, key_length=1, with_zerofill=true) at /data/src/5.5/sql/key.cc:126

#5  0x000000000072cbcf in JOIN_CACHE_BNLH::get_matching_chain_by_join_key (this=0x7f3fddca6518) at /data/src/5.5/sql/sql_join_cache.cc:3635

#6  0x000000000072cc60 in JOIN_CACHE_BNLH::prepare_look_for_matches (this=0x7f3fddca6518, skip_last=false) at /data/src/5.5/sql/sql_join_cache.cc:3672

#7  0x000000000072aca2 in JOIN_CACHE::join_matching_records (this=0x7f3fddca6518, skip_last=false) at /data/src/5.5/sql/sql_join_cache.cc:2272

#8  0x000000000072a771 in JOIN_CACHE::join_records (this=0x7f3fddca6518, skip_last=false) at /data/src/5.5/sql/sql_join_cache.cc:2086

#9  0x000000000065774a in sub_select_cache (join=0x7f3fddc469c0, join_tab=0x7f3fddc93828, end_of_records=true) at /data/src/5.5/sql/sql_select.cc:16734

#10 0x0000000000657955 in sub_select (join=0x7f3fddc469c0, join_tab=0x7f3fddc93508, end_of_records=true) at /data/src/5.5/sql/sql_select.cc:16904

#11 0x000000000065743e in do_select (join=0x7f3fddc469c0, fields=0x7f3fe1b4cb88, table=0x0, procedure=0x0) at /data/src/5.5/sql/sql_select.cc:16615

#12 0x0000000000635c63 in JOIN::exec (this=0x7f3fddc469c0) at /data/src/5.5/sql/sql_select.cc:2873

#13 0x000000000063642e in mysql_select (thd=0x7f3fe1b49060, rref_pointer_array=0x7f3fe1b4cce0, tables=0x7f3fddc45290, wild_num=1, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7f3fddc469a0, unit=0x7f3fe1b4c390, select_lex=0x7f3fe1b4ca70) at /data/src/5.5/sql/sql_select.cc:3094

#14 0x000000000062cd14 in handle_select (thd=0x7f3fe1b49060, lex=0x7f3fe1b4c2e0, result=0x7f3fddc469a0, setup_tables_done_option=0) at /data/src/5.5/sql/sql_select.cc:319

#15 0x0000000000606175 in execute_sqlcom_select (thd=0x7f3fe1b49060, all_tables=0x7f3fddc45290) at /data/src/5.5/sql/sql_parse.cc:4689

#16 0x00000000005ff4c6 in mysql_execute_command (thd=0x7f3fe1b49060) at /data/src/5.5/sql/sql_parse.cc:2234

#17 0x0000000000608d40 in mysql_parse (thd=0x7f3fe1b49060, rawbuf=0x7f3fddc45078 "SELECT * FROM t1 LEFT JOIN t2 ON b1 = b2", length=40, parser_state=0x7f3fe4b59650) at /data/src/5.5/sql/sql_parse.cc:5934

#18 0x00000000005fca55 in dispatch_command (command=COM_QUERY, thd=0x7f3fe1b49060, packet=0x7f3fdee53061 "", packet_length=40) at /data/src/5.5/sql/sql_parse.cc:1079

#19 0x00000000005fbc0f in do_command (thd=0x7f3fe1b49060) at /data/src/5.5/sql/sql_parse.cc:793

#20 0x00000000006fde45 in do_handle_one_connection (thd_arg=0x7f3fe1b49060) at /data/src/5.5/sql/sql_connect.cc:1270

#21 0x00000000006fdbd2 in handle_one_connection (arg=0x7f3fe1b49060) at /data/src/5.5/sql/sql_connect.cc:1186

#22 0x000000000093dc53 in pfs_spawn_thread (arg=0x7f3fdfbed3e0) at /data/src/5.5/storage/perfschema/pfs.cc:1015

#23 0x00007f3fe47920a4 in start_thread (arg=0x7f3fe4b5a700) at pthread_create.c:309

#24 0x00007f3fe321587d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111