Assertion `is_null() || is_empty() || !check_name(*this)' failed in Lex_ident_db::Lex_ident_db after USE `#mysql50#db` and old_mode reset

let $D= `select @@datadir`;

--mkdir $D/d-b

set old_mode=MYSQL50_TABLE_NAMES;

use `#mysql50#d-b`;

set old_mode=default;

create table x (a int);

drop table x;

use test;

set old_mode=MYSQL50_TABLE_NAMES;

drop database `#mysql50#d-b`;

13.1.0-MariaDB-asan-debug-log source revision: 7a9aef7627c61b9c4c0b7be9ea55f1dd76e0db4d

mariadbd: /13.2/src/sql/lex_ident.h:221: Lex_ident_db::Lex_ident_db(const LEX_CSTRING&): Assertion `is_null() || is_empty() || !check_name(*this)' failed.

#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44

#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78

#2  __GI___pthread_kill (threadid=<optimized out>, signo=6) at ./nptl/pthread_kill.c:89

#3  0x000055e365e1a25a in my_write_core (sig=6) at /13.2/src/mysys/stacktrace.c:424

#4  0x000055e363f1c97d in handle_fatal_signal (sig=6) at /13.2/src/sql/signal_handler.cc:298

#5  <signal handler called>

#6  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44

#7  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78

#8  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89

#9  0x00007d636fa4527e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26

#10 0x00007d636fa288ff in __GI_abort () at ./stdlib/abort.c:79

#11 0x00007d636fa2881b in __assert_fail_base (fmt=0x7d636fbd1208 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x55e363165180 "is_null() || is_empty() || !check_name(*this)", file=file@entry=0x55e3631651e0 "/13.2/src/sql/lex_ident.h", line=line@entry=221, function=function@entry=0x55e363165240 "Lex_ident_db::Lex_ident_db(const LEX_CSTRING&)") at ./assert/assert.c:96

#12 0x00007d636fa3b517 in __assert_fail (assertion=0x55e363165180 "is_null() || is_empty() || !check_name(*this)", file=0x55e3631651e0 "/13.2/src/sql/lex_ident.h", line=221, function=0x55e363165240 "Lex_ident_db::Lex_ident_db(const LEX_CSTRING&)") at ./assert/assert.c:105

#13 0x000055e363f65450 in Lex_ident_db::Lex_ident_db (this=0x7d63636c9720, str=...) at /13.2/src/sql/lex_ident.h:221

#14 0x000055e363f675e6 in TABLE_LIST::init_one_table (this=0x7d6363cc9840, db_arg=<optimized out>, table_name_arg=0x52d0000f05f8, alias_arg=0x0, lock_type_arg=<optimized out>) at /13.2/src/sql/table.h:2562

#15 0x000055e364b46d20 in create_table_impl (thd=thd@entry=0x52c000080220, ddl_log_state_create=ddl_log_state_create@entry=0x7d63638d2640, ddl_log_state_rm=ddl_log_state_rm@entry=0x7d63638d2680, orig_db=..., orig_table_name=..., db=..., table_name=..., path=..., options=..., create_info=<optimized out>, alter_info=<optimized out>, create_table_mode=<optimized out>, is_trans=<optimized out>, key_info=<optimized out>, key_count=<optimized out>, frm=<optimized out>) at /13.2/src/sql/sql_table.cc:4800

#16 0x000055e364b48abe in mysql_create_table_no_lock (thd=thd@entry=0x52c000080220, ddl_log_state_create=ddl_log_state_create@entry=0x7d63638d2640, ddl_log_state_rm=ddl_log_state_rm@entry=0x7d63638d2680, create_info=create_info@entry=0x7d6363a54350, alter_info=alter_info@entry=0x7d6363a54190, is_trans=is_trans@entry=0x7d63638d2630, create_table_mode=<optimized out>, table_list=<optimized out>) at /13.2/src/sql/sql_table.cc:5083

#17 0x000055e364b4c1fb in mysql_create_table (thd=thd@entry=0x52c000080220, create_table=create_table@entry=0x52d0000f05c8, create_info=create_info@entry=0x7d6363a54350, alter_info=alter_info@entry=0x7d6363a54190) at /13.2/src/sql/sql_table.cc:5329

#18 0x000055e364b4ecb6 in Sql_cmd_create_table_like::execute (this=<optimized out>, thd=0x52c000080220) at /13.2/src/sql/sql_table.cc:13923

#19 0x000055e364876deb in mysql_execute_command (thd=thd@entry=0x52c000080220, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /13.2/src/sql/sql_parse.cc:5908

#20 0x000055e364878c4b in mysql_parse (thd=thd@entry=0x52c000080220, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x7d6363cc71b0) at /13.2/src/sql/sql_parse.cc:7959

#21 0x000055e36487c8ff in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x52c000080220, packet=packet@entry=0x52900028f221 "create table x (a int)", packet_length=packet_length@entry=22, blocking=blocking@entry=true) at /13.2/src/sql/sql_parse.cc:1903

#22 0x000055e36488125e in do_command (thd=thd@entry=0x52c000080220, blocking=blocking@entry=true) at /13.2/src/sql/sql_parse.cc:1437

#23 0x000055e364d6f761 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x50b000004cb0, put_in_cache=put_in_cache@entry=true) at /13.2/src/sql/sql_connect.cc:1514

#24 0x000055e364d6fb67 in handle_one_connection (arg=arg@entry=0x50b000004cb0) at /13.2/src/sql/sql_connect.cc:1426

#25 0x00007d6370a5ea42 in asan_thread_start (arg=0x7d6364af7000) at ../../../../src/libsanitizer/asan/asan_interceptors.cpp:234

#26 0x00007d636fa9cb84 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447

#27 0x00007d636fb29ecc in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78