[MDEV-34288] SET NAMES DEFAULT crashes `mariadbd --collation-server=utf8mb4_unicode_ci` - Jira

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Type: Bug
Status: Closed (View Workflow)
Priority: Critical
Resolution: Fixed
Affects Version/s: 10.9, 10.10, 10.11, 11.0, 11.1, 11.2, 11.3, 11.4, 11.5, 11.6
Fix Version/s: 10.11.9, 11.1.6, 11.2.5, 11.4.3, 11.5.2, 11.6.0
Component/s: Character Sets
Labels:
None

I start a debug-compiled server with some collation which is not default compiled collation in its character set, e.g.:

mariadbd --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

Then I run this statement:

SET NAMES DEFAULT;

The server crashed with the following stack:

#0  0x00007ffff72ae834 in __pthread_kill_implementation () from /lib64/libc.so.6

#1  0x00007ffff725c8ee in raise () from /lib64/libc.so.6

#2  0x00007ffff72448ff in abort () from /lib64/libc.so.6

#3  0x00007ffff724481b in __assert_fail_base.cold () from /lib64/libc.so.6

#4  0x00007ffff7254c57 in __assert_fail () from /lib64/libc.so.6

#5  0x0000555555f9834d in Lex_exact_charset_opt_extended_collate::Lex_exact_charset_opt_extended_collate (this=0x7ffff7008620,

    ci=0x555557c58360 <my_charset_utf8mb4_unicode_ci>, with_collate=false)

    at /home/bar/maria-git/10.11.names/sql/lex_charset.h:335

#6  0x000055555636b20a in MYSQLparse (thd=0x7fff8c000dc8)

    at /home/bar/maria-git/10.11.names/sql/sql_yacc.yy:16675

#7  0x0000555556026e18 in parse_sql (thd=0x7fff8c000dc8, parser_state=0x7ffff7009320,

    creation_ctx=0x0, do_pfs_digest=true)

    at /home/bar/maria-git/10.11.names/sql/sql_parse.cc:10437

#8  0x000055555602150e in mysql_parse (thd=0x7fff8c000dc8,

    rawbuf=0x7fff8c016770 "SET NAMES DEFAULT", length=17, parser_state=0x7ffff7009320)

    at /home/bar/maria-git/10.11.names/sql/sql_parse.cc:8078

#9  0x000055555600cc6d in dispatch_command (command=COM_QUERY, thd=0x7fff8c000dc8,

    packet=0x7fff8c00bb49 "SET NAMES DEFAULT", packet_length=17, blocking=true)

    at /home/bar/maria-git/10.11.names/sql/sql_parse.cc:1895

#10 0x000055555600b5c6 in do_command (thd=0x7fff8c000dc8, blocking=true)

    at /home/bar/maria-git/10.11.names/sql/sql_parse.cc:1408

#11 0x0000555556201b57 in do_handle_one_connection (connect=0x555558d892f8,

    put_in_cache=true) at /home/bar/maria-git/10.11.names/sql/sql_connect.cc:1417

#12 0x00005555562018cc in handle_one_connection (arg=0x555558d892f8)

    at /home/bar/maria-git/10.11.names/sql/sql_connect.cc:1319

#13 0x0000555556739dd2 in pfs_spawn_thread (arg=0x555558cb2b28)

    at /home/bar/maria-git/10.11.names/storage/perfschema/pfs.cc:2201

#14 0x00007ffff72ac897 in start_thread () from /lib64/libc.so.6

#15 0x00007ffff7333a5c in clone3 () from /lib64/libc.so.6

blocks

MDEV-19123 Change default charset from latin1 to utf8mb4

is caused by

MDEV-27743 Remove Lex::charset

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