@Seppo,
Here is another crash which clearly shows an ALTER, we do not have the ALTER statement nor the table though, this is the same PXC 5.6.20 version different server.
[root@t2-mysql02 percona]# resolve_stack_dump -s mysqld.symbols -n t|c++filt 0x8f5835 my_print_stacktrace + 53 0x664384 handle_fatal_signal + 1204 0x3a0d20f710 _end + 199934632 0x3a0cb282aa _end + 192695874 0xa5ba31 std::_Rb_tree<dict_foreign_t*, dict_foreign_t*, std::_Identity<dict_foreign_t*>, dict_foreign_compare, std::allocator<dict_foreign_t*> >::_M_insert_unique(dict_foreign_t* const&) + 81 0xa59307 wsrep_dict_foreign_find_index(dict_table_t*, char const**, char const**, unsigned long, dict_index_t*, unsigned long, unsigned long) + 34727 0xa5b5a5 wsrep_dict_foreign_find_index(dict_table_t*, char const**, char const**, unsigned long, dict_index_t*, unsigned long, unsigned long) + 43589 0x9af6c1 PageConverter::~PageConverter() + 100401 0x913a09 wsrep_append_foreign_key(trx_t*, dict_foreign_t*, unsigned char const*, dict_index_t*, unsigned long, unsigned long) + 18953 0x5a7ab1 ha_create_table(THD*, char const*, char const*, char const*, st_ha_create_information*, bool, bool) + 561 0x744ce0 mysql_alter_table(THD*, char*, char*, st_ha_create_information*, TABLE_LIST*, Alter_info*, unsigned int, st_order*, bool) + 9376 0x835487 Sql_cmd_alter_table::execute(THD*) + 1351 0x6e990e mysql_execute_command(THD*) + 5006 0x6eedc8 mysql_parse(THD*, char*, unsigned int, Parser_state*) + 1624 0x893925 Query_log_event::do_apply_event(Relay_log_info const*, char const*, unsigned int) + 1909 0x8976b4 Log_event::apply_event(Relay_log_info*) + 116 0x59c0e6 wsrep_apply_cb(void*, void const*, unsigned long, unsigned int, wsrep_trx_meta const*) + 1654 0x7f42b8390a81 _end + -1224550887 0x7f42b83c8965 _end + -1224321795 0x7f42b83c9383 _end + -1224319205 0x7f42b83cdd35 _end + -1224300339 0x7f42b83a76ca _end + -1224457630 0x7f42b83a7ce3 _end + -1224456069 0x7f42b83c5ef3 _end + -1224332661 0x7f42b83dcba3 _end + -1224239301 0x59cf31 wsrep_client_rollback(THD*) + 881 0x58866e start_wsrep_THD + 878 0x3a0d2079d1 _end + 199902569 0x3a0cae886d _end + 192435205 [root@t2-mysql02 percona]#
@Seppo,
Here is another crash which clearly shows an ALTER, we do not have the ALTER statement nor the table though, this is the same PXC 5.6.20 version different server.
[root@t2-mysql02 percona]# resolve_stack_dump -s mysqld.symbols -n t|c++filt tree<dict_ foreign_ t*, dict_foreign_t*, std::_Identity< dict_foreign_ t*>, dict_foreign_ compare, std::allocator< dict_foreign_ t*> >::_M_insert_ unique( dict_foreign_ t* const&) + 81 foreign_ find_index( dict_table_ t*, char const**, char const**, unsigned long, dict_index_t*, unsigned long, unsigned long) + 34727 foreign_ find_index( dict_table_ t*, char const**, char const**, unsigned long, dict_index_t*, unsigned long, unsigned long) + 43589 :~PageConverter () + 100401 foreign_ key(trx_ t*, dict_foreign_t*, unsigned char const*, dict_index_t*, unsigned long, unsigned long) + 18953 table(THD* , char const*, char const*, char const*, st_ha_create_ information* , bool, bool) + 561 table(THD* , char*, char*, st_ha_create_ information* , TABLE_LIST*, Alter_info*, unsigned int, st_order*, bool) + 9376 alter_table: :execute( THD*) + 1351 command( THD*) + 5006 event:: do_apply_ event(Relay_ log_info const*, char const*, unsigned int) + 1909 :apply_ event(Relay_ log_info* ) + 116 cb(void* , void const*, unsigned long, unsigned int, wsrep_trx_meta const*) + 1654 rollback( THD*) + 881
0x8f5835 my_print_stacktrace + 53
0x664384 handle_fatal_signal + 1204
0x3a0d20f710 _end + 199934632
0x3a0cb282aa _end + 192695874
0xa5ba31 std::_Rb_
0xa59307 wsrep_dict_
0xa5b5a5 wsrep_dict_
0x9af6c1 PageConverter:
0x913a09 wsrep_append_
0x5a7ab1 ha_create_
0x744ce0 mysql_alter_
0x835487 Sql_cmd_
0x6e990e mysql_execute_
0x6eedc8 mysql_parse(THD*, char*, unsigned int, Parser_state*) + 1624
0x893925 Query_log_
0x8976b4 Log_event:
0x59c0e6 wsrep_apply_
0x7f42b8390a81 _end + -1224550887
0x7f42b83c8965 _end + -1224321795
0x7f42b83c9383 _end + -1224319205
0x7f42b83cdd35 _end + -1224300339
0x7f42b83a76ca _end + -1224457630
0x7f42b83a7ce3 _end + -1224456069
0x7f42b83c5ef3 _end + -1224332661
0x7f42b83dcba3 _end + -1224239301
0x59cf31 wsrep_client_
0x58866e start_wsrep_THD + 878
0x3a0d2079d1 _end + 199902569
0x3a0cae886d _end + 192435205
[root@t2-mysql02 percona]#