Headline
CVE-2021-46661: [MDEV-25766] Unused CTE lead to a crash in find_field_in_tables/find_order_in_list
MariaDB through 10.5.9 allows an application crash in find_field_in_tables and find_order_in_list via an unused common table expression (CTE).
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
To report this bug, see https://mariadb.com/kb/en/reporting-bugs
We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.
Server version: 10.5.9-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=2
max_threads=153
thread_count=2
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467864 K bytes of memory
Hope that’s ok; if not, decrease some variables in the equation.
Thread pointer: 0x62b00007e218
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong…
stack_bottom = 0x7f26a2226600 thread_stack 0x5fc00
/usr/local/mysql/bin/mariadbd(__interceptor_backtrace+0x5b)[0x917bfb]
:0(mi_state_info_read)[0x6ad5ad8]
sql/sql_yacc.cc:46457(MYSQLparse(THD*))[0x2beef02]
sigaction.c:0(__restore_rt)[0x7f26c1a133c0]
sql/protocol.h:0(Protocol_text)[0xe8530c]
sql/sql_lex.cc:1164(Lex_input_stream::add_digest_token(unsigned int, YYSTYPE*))[0x1567533]
sql/sql_parse.cc:8709(st_select_lex::add_cross_joined_table(TABLE_LIST*, TABLE_LIST*, bool))[0x17aeebc]
??:0(Lex_input_stream::body_utf8_append(char const*, char const*))[0x1564878]
sql/sql_lex.cc:120(sp_expr_lex::case_stmt_action_when(bool))[0x155372f]
sql_select.cc:0(change_cond_ref_to_const(THD*, I_List<COND_CMP>*, Item*, Item*, Item_bool_func2*, Item*, Item*))[0x1c45226]
sql_select.cc:0(trace_table_dependencies(THD*, st_join_table*, unsigned int))[0x1c05a9e]
??:0(JOIN_CACHE::create_remaining_fields())[0x260f8eb]
??:0(JOIN_CACHE::create_remaining_fields())[0x260ee4d]
??:0(LEX::create_item_for_sp_var(Lex_ident_cli_st const*, sp_variable*))[0x15571b6]
??:0(select_create::abort_result_set())[0x1536385]
sql/sql_insert.cc:5068(select_create::abort_result_set())[0x1534614]
sql/sql_class.cc:2550(THD::make_string_literal_charset(Lex_string_with_metadata_st const&, charset_info_st const*))[0x1386f2f]
sql/sql_cache.cc:4324(Query_cache::move_by_type(unsigned char**, Query_cache_block**, unsigned long*, Query_cache_block*))[0x133cf2d]
??:0(Query_cache::store_query(THD*, TABLE_LIST*))[0x1308593]
??:0(Query_cache::lock_and_suspend())[0x12f7243]
??:0(Query_cache::is_cacheable(THD*, LEX*, TABLE_LIST*, unsigned char*))[0x130cd19]
??:0(st_select_lex_unit::cleanup())[0x2023c1d]
??:0(st_select_lex_unit::cleanup())[0x202215d]
maria/ma_write.c:402(maria_write)[0x46e90f3]
nptl/pthread_create.c:478(start_thread)[0x7f26c1a07609]
??:0(clone)[0x7f26c0d79293]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x62b000085238): WITH
jennifer_0 AS (select
subq\_0.c4 as c6
from
((select
11 as c4
from
t\_wk as ref\_0
) as subq\_0
left outer join t\_wk as ref\_2
on (11 <> 19))
)
select
subq\_2.c2 as c4
from
(select distinct
61 as c2
from
t\_ykc as ref\_13
) as subq\_2
Connection ID (thread ID): 637
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
The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains
information that should help you find out what is causing the crash.
Writing a core file…
Working directory at /usr/local/mysql/data
Resource Limits:
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 0 bytes
Max resident set unlimited unlimited bytes
Max processes 79624 79624 processes
Max open files 1048576 1048576 files
Max locked memory 67108864 67108864 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 79624 79624 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
Core pattern: core
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