SELECT ( WITH RECURSIVE x ( x ) AS ( SELECT 1 UNION SELECT x FROM x ) SELECT ( ( SELECT 1 FROM ( SELECT 1 FROM x ) x GROUP BY x HAVING x = 1 ) ) FROM x GROUP BY 1 ) ;

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mariadbd(_ZN24Item_singlerow_subselect7val_intEv+0x24)[0x55d3a50aa784]

mariadbd(_ZN4Item17save_int_in_fieldEP5Fieldb+0x23)[0x55d3a4ff25d3]

mariadbd(_ZN4Item13save_in_fieldEP5Fieldb+0x37)[0x55d3a4fe1bf7]

mariadbd(_Z10copy_funcsPP4ItemPK3THD+0x3a)[0x55d3a4dc028a]

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mariadbd(_ZNK12Type_handler14Item_send_longEP4ItemP8ProtocolP8st_value+0x1d)[0x55d3a4f2089d]

mariadbd(_ZN8Protocol19send_result_set_rowEP4ListI4ItemE+0xea)[0x55d3a4c7ecfa]

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mariadbd(_Z12mysql_selectP3THDP10TABLE_LISTR4ListI4ItemEPS4_jP8st_orderS9_S7_S9_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x12c)[0x55d3a4dd6f7c]

mariadbd(_Z13handle_selectP3THDP3LEXP13select_resulty+0x154)[0x55d3a4dd7774]

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mariadbd(_Z11mysql_parseP3THDPcjP12Parser_state+0x1e7)[0x55d3a4d5b237]

mariadbd(_Z16dispatch_command19enum_server_commandP3THDPcjb+0x14bd)[0x55d3a4d5da1d]

mariadbd(_Z10do_commandP3THDb+0x138)[0x55d3a4d5f818]

mariadbd(_Z24do_handle_one_connectionP7CONNECTb+0x3bf)[0x55d3a4e873af]

mariadbd(handle_one_connection+0x5d)[0x55d3a4e876fd]

mariadbd(+0xcd1906)[0x55d3a51f5906]

/lib/x86_64-linux-gnu/libc.so.6(+0x94b43)[0x7f3f69d0cb43]

/lib/x86_64-linux-gnu/libc.so.6(clone+0x44)[0x7f3f69d9dbb4]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x7f3f040130d8): SELECT ( WITH RECURSIVE x ( x ) AS ( SELECT 1 UNION SELECT x FROM x ) SELECT ( ( SELECT 1 FROM ( SELECT 1 FROM x ) x GROUP BY x HAVING x = 1 ) ) FROM x GROUP BY 1 )

Connection ID (thread ID): 4

Status: NOT_KILLED

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off,hash_join_cardinality=on