Server crashes in MDL_key::mdl_key_init (main.lowercase_table4 test fails)

	mysqld.exe!my_sigabrt_handler(int sig) Line 477	C

 	mysqld.exe!raise(int signum) Line 593	C

 	mysqld.exe!abort() Line 82	C

 	mysqld.exe!_wassert(const wchar_t * expr, const wchar_t * filename, unsigned int lineno) Line 355	C

 	mysqld.exe!MDL_key::mdl_key_init(MDL_key::enum_mdl_namespace mdl_namespace, const char * db, const char * name) Line 354	C++

 	mysqld.exe!MDL_request::init(MDL_key::enum_mdl_namespace mdl_namespace, const char * db_arg, const char * name_arg, enum_mdl_type mdl_type_arg, enum_mdl_duration mdl_duration_arg) Line 1244	C++

 	mysqld.exe!TABLE_LIST::init_one_table(const char * db_name_arg, unsigned __int64 db_length_arg, const char * table_name_arg, unsigned __int64 table_name_length_arg, const char * alias_arg, thr_lock_type lock_type_arg) Line 1702	C++

 	mysqld.exe!check_fk_parent_table_access(THD * thd, HA_CREATE_INFO * create_info, Alter_info * alter_info) Line 6098	C++

 	mysqld.exe!mysql_alter_table(THD * thd, char * new_db, char * new_name, HA_CREATE_INFO * create_info, TABLE_LIST * table_list, Alter_info * alter_info, unsigned int order_num, st_order * order, bool ignore) Line 8395	C++

 	mysqld.exe!Sql_cmd_alter_table::execute(THD * thd) Line 312	C++

 	mysqld.exe!mysql_execute_command(THD * thd) Line 5107	C++

 	mysqld.exe!mysql_parse(THD * thd, char * rawbuf, unsigned int length, Parser_state * parser_state) Line 6546	C++

 	mysqld.exe!dispatch_command(enum_server_command command, THD * thd, char * packet, unsigned int packet_length) Line 1310	C++

 	mysqld.exe!do_command(THD * thd) Line 998	C++

 	mysqld.exe!threadpool_process_request(THD * thd) Line 233	C++

 	mysqld.exe!io_completion_callback(_TP_CALLBACK_INSTANCE * instance, void * context, void * overlapped, unsigned long io_result, unsigned __int64 nbytes, _TP_IO * io) Line 568	C++

 	kernel32.dll!00000000775832e2()	Unknown