210813  4:24:26 [ERROR] mysqld got signal 11 ;
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-debug
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=1
max_threads=153
thread_count=1
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467968 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x62b000093288
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 = 0x7f9be6183580 thread_stack 0x5fc00
/usr/local/mysql/bin/mariadbd(__interceptor_backtrace+0x5b)[0x8dd7db]
:0(_mi_get_pack_key)[0x870c377]
sql/item_windowfunc.h:636(Item_sum_cume_dist::reset_field())[0x33ede22]
sigaction.c:0(__restore_rt)[0x7f9c071b03c0]
sql/item_func.cc:0(Item_func::fix_fields(THD*, Item**))[0x3d16c1f]
??:0(Item_func_case::Item_func_case(Item_func_case const&))[0x3c749a7]
sql/item_strfunc.h:368(Item_func_regexp_replace)[0x3ce600d]
psi/mysql_file.h:1079(inline_mysql_file_open(unsigned int, char const*, unsigned int, char const*, int, unsigned long))[0x3920b7a]
handler.cc:0(xid_to_str(char*, xid_t const&))[0x3920614]
sql/field.h:3986(Field_string::is_var_string() const)[0x37494c7]
client.c:0(native_password_auth_client)[0x3565731]
??:0(is_temporal_type_with_date(enum_field_types))[0x371a6bd]
??:0(ha_rollback_to_savepoint(THD*, st_savepoint*))[0x3838fc1]
??:0(merge_many_buff(Sort_param*, Bounds_checked_array<unsigned char>, Merge_chunk*, unsigned int*, st_io_cache*))[0x37a41d9]
client.c:0(native_password_auth_client)[0x3565b1f]
sql_prepare.cc:0(mysql_test_show_slave_status(Prepared_statement*, bool))[0x1bd55b7]
sql/sql_base.cc:6940(mark_common_columns(THD*, TABLE_LIST*, TABLE_LIST*, List<String>*, unsigned int*))[0x1401033]
sql_prepare.cc:0(mysql_test_delete(Prepared_statement*, TABLE_LIST*))[0x1bccd73]
??:0(change_master(THD*, Master_info*, bool*))[0x1c59c00]
sql_prepare.cc:0(mysql_test_show_create_table(Prepared_statement*, TABLE_LIST*))[0x1bd2451]
sql/sql_prepare.cc:1980(mysql_test_show_binlog_status(Prepared_statement*))[0x1bd5a9e]
sql/item_func.cc:360(Item_func::fix_fields(THD*, Item**))[0x3d16587]
??:0(Item_func_case::Item_func_case(Item_func_case const&))[0x3c749a7]
sql/sql_parse.cc:4452(mysql_execute_command(THD*))[0x1a015b9]
??:0(mysql_execute_command(THD*))[0x19de60b]
sql/item.h:462(Settable_routine_parameter)[0x191864e]
??:0(Type_cast_attributes::Type_cast_attributes(char const*, char const*, charset_info_st const*))[0x1932e79]
sql/table.h:2058(vers_select_conds_t::is_set() const)[0x18f8028]
??:0(DTCollation::DTCollation(charset_info_st const*))[0x1414fa9]
sql_servers.cc:0(insert_server_record(TABLE*, st_federated_server*))[0x29f5f3e]
sql/sql_tvc.h:50(table_value_constr)[0x1911d12]
??:0(Type_cast_attributes::Type_cast_attributes(char const*, char const*, charset_info_st const*))[0x1932e79]
sql/table.h:2058(vers_select_conds_t::is_set() const)[0x18f8028]
??:0(DTCollation::DTCollation(charset_info_st const*))[0x1414fa9]
sql_servers.cc:0(insert_server_record(TABLE*, st_federated_server*))[0x29f5f3e]
sql/sql_tvc.h:50(table_value_constr)[0x1911d12]
??:0(Type_cast_attributes::Type_cast_attributes(char const*, char const*, charset_info_st const*))[0x1932e79]
sql/table.h:2058(vers_select_conds_t::is_set() const)[0x18f8028]
??:0(Lex_trim_st::make_item_func_trim_std(THD*) const)[0x18a8afe]
??:0(LEX::make_item_func_substr(THD*, Item*, Item*))[0x18a5a5d]
??:0(mysql_upgrade_db(THD*, st_mysql_const_lex_string const*))[0x164cc11]
sql/sql_lex.h:1985(Query_tables_list::set_stmt_unsafe(Query_tables_list::enum_binlog_stmt_unsafe))[0x15f3b55]
sql/sql_class.cc:5886(start_new_trans)[0x15a9fad]
??:0(open_purge_table(THD*, char const*, unsigned long, char const*, unsigned long))[0x1591329]
sql/sql_class.cc:6284(THD::decide_logging_format(TABLE_LIST*))[0x15b2502]
??:0(TABLE_SHARE::init_from_binary_frm_image(THD*, bool, unsigned char const*, unsigned long, unsigned char const*, unsigned long))[0x262b03d]
??:0(TABLE_SHARE::init_from_binary_frm_image(THD*, bool, unsigned char const*, unsigned long, unsigned char const*, unsigned long))[0x26294fd]
:0(maria_repair)[0x5608773]
nptl/pthread_create.c:478(start_thread)[0x7f9c071a4609]
??:0(clone)[0x7f9c06428293]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x62b0000772a8): WITH 
jennifer_1 AS (select distinct 
    case when ref_1.c_l2i8lidek not in (
          select  
              ref_5.c_l2i8lidek as c0
            from 
              t_ykc as ref_5
            ) then ref_1.c_l2i8lidek else ref_1.c_l2i8lidek end
       as c0
  from 
    t_ykc as ref_1
  where ((select c_l2i8lidek from t_ykc order by c_l2i8lidek limit 1 offset 5)
         in (
      select  
            ref_2.c_l2i8lidek as c0
          from 
            (t_ykc as ref_2
              cross join t_ykc as ref_3
              )
        )) 
  ), 

jennifer_2 AS (select distinct 
    ref_8.c_l2i8lidek as c0, 
    (select c_l2i8lidek from t_ykc order by c_l2i8lidek limit 1 offset 3)
       as c1, 
    ref_8.c_l2i8lidek as c2, 
    ref_8.c_l2i8lidek as c3, 
    ref_8.c_l2i8lidek as c4, 
    cast(coalesce(ref_8.c_l2i8lidek,
      ref_8.c_l2i8lidek) as SIGNED) as c5
  from 
    t_ykc as ref_8
  ), 

jennifer_3 AS (select  
    ((select c_l2i8lidek from t_ykc order by c_l2i8lidek limit 1 offset 1)
         * subq_0.c0) as c0, 
    (subq_0.c0 < subq_0.c0) as c1, 
    subq_0.c0 as c5, 
    subq_0.c0 as c6, 
    
      LAST_VALUE(
        cast(subq_0.c0 as SIGNED)) over (partition by subq_0.c0 order by subq_0.c0) as c10, 
    (subq_0.c0 + subq_0.c0) as c12
  from 
    (select  
          ref_9.c_l2i8lidek as c0, 
          ref_9.c_l2i8lidek as c1
        from 
          t_ykc as ref_9
    ) as subq_0
  )
select distinct 
    case when ref_10.c1 >= ( 
        select  
              ref_10.c5 >= ( 
                select distinct 
                      ref_10.c10 as c0
                    from 
                      jennifer_2 as ref_12
                    where ref_11.c0 < ( 
                        select  
                            ref_11.c0 as c0
                          from 
                            jennifer_1 as ref_16
                          where 1=1)
                    window a as ( partition by (select c0 from jennifer_1 order by c0 limit 1 offset 3)
                         order by ref_11.c0 desc)
                  ) as c0
            from 
              t_ued0ue as ref_11
            ) then ref_10.c6 else ref_10.c6 end
       as c0 
  from 
    jennifer_3 as ref_10

Connection ID (thread ID): 12
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                    unlimited            bytes     
Max resident set          unlimited            unlimited            bytes     
Max processes             79615                79615                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       79615                79615                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: |/usr/share/apport/apport %p %s %c %d %P %E

210813 04:24:27 mysqld_safe Number of processes running now: 0
210813 04:24:27 mysqld_safe mysqld restarted