191014 15:57:21 [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: 10.3.13-MariaDB-log

key_buffer_size=1073741824

read_buffer_size=524288000

max_used_connections=3

max_threads=153

thread_count=12

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 239820094 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7f88e40012a8

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 = 0x7f9c240cf5d0 thread_stack 0x49000

/usr/local/mariadb/bin/mysqld(my_print_stacktrace+0x2e)[0x5617cb4ff1be]

/usr/local/mariadb/bin/mysqld(handle_fatal_signal+0x357)[0x5617cafa26e7]

/lib64/libpthread.so.0(+0xf5d0)[0x7f9c296925d0]

/lib64/libc.so.6(+0x14d814)[0x7f9c28dfa814]

/usr/local/mariadb/bin/mysqld(insert_dynamic+0x2a)[0x5617cb4d716a]

/usr/local/mariadb/bin/mysqld(+0x7f2035)[0x5617cb016035]

/usr/local/mariadb/bin/mysqld(_ZN22Item_func_get_user_var18fix_length_and_decEv+0x49)[0x5617cb016569]

/usr/local/mariadb/bin/mysqld(_ZN9Item_func10fix_fieldsEP3THDPP4Item+0x15c)[0x5617cb00bf7c]

mysys/array.c:103(insert_dynamic)[0x5617cb00bf5f]

sql/item_func.cc:5422(get_var_with_binlog(THD*, enum_sql_command, st_mysql_const_lex_string*, user_var_entry**))[0x5617cb0358d2]

sql/item_func.cc:5448(Item_func_get_user_var::fix_length_and_dec())[0x5617cb00bf5f]

sql/item_strfunc.cc:111(Item_str_func::fix_fields(THD*, Item**))[0x5617cb0167b8]

sql/item_func.cc:363(Item_func::fix_fields(THD*, Item**))[0x5617cad25f98]

sql/set_var.cc:874(set_var_user::check(THD*))[0x5617cad27d39]

sql/set_var.cc:733(sql_set_variables(THD*, List<set_var_base>*, bool))[0x5617cadd0310]

sql/sql_parse.cc:5141(mysql_execute_command(THD*))[0x5617cad396d5]

sql/sp_head.cc:3596(sp_instr_stmt::exec_core(THD*, unsigned int*))[0x5617cad41139]

sql/sp_head.cc:3322(sp_lex_keeper::reset_lex_and_exec_core(THD*, unsigned int*, bool, sp_instr*))[0x5617cad41b7b]

sql/sp_head.cc:3501(sp_instr_stmt::execute(THD*, unsigned int*))[0x5617cad3d050]

sql/sp_head.cc:1356(sp_head::execute(THD*, bool))[0x5617cad3ebba]

sql/sp_head.cc:2014(sp_head::execute_function(THD*, Item**, unsigned int, Field*, sp_rcontext**, Query_arena*))[0x5617cafbf698]

sql/item.cc:3004(Item_sp::execute_impl(THD*, Item**, unsigned int))[0x5617cafbf8e1]

sql/item.cc:2912(Item_sp::execute(THD*, bool*, Item**, unsigned int))[0x5617cb022948]

sql/item_func.h:2915(Item_func_sp::val_str(String*))[0x5617cafd5b8d]

sql/item_cmpfunc.cc:762(Arg_comparator::compare_string())[0x5617cafd663a]

sql/item_cmpfunc.cc:1729(Item_func_eq::val_int())[0x5617caef2970]

sql/sql_type.cc:3211(Type_handler_int_result::Item_val_bool(Item*) const)[0x5617cafd40fa]

sql/item_cmpfunc.cc:5038(Item_cond_and::val_int())[0x5617caef2970]

sql/sql_type.cc:3211(Type_handler_int_result::Item_val_bool(Item*) const)[0x5617cafd5c2d]

sql/item_cmpfunc.cc:2891(Item_func_case_searched::find_item())[0x5617cafd34c6]

sql/item_cmpfunc.cc:2926(Item_func_case::str_op(String*))[0x5617cafc4d01]

sql/item.cc:6815(Item::save_str_in_field(Field*, bool))[0x5617cafb66b6]

sql/item.cc:6864(Item::save_in_field(Field*, bool))[0x5617cad79288]

sql/sql_base.cc:8567(fill_record(THD*, TABLE*, Field**, List<Item>&, bool, bool))[0x5617cae640db]

sql/sql_union.cc:128(select_unit::send_data(List<Item>&))[0x5617cae13fdf]

sql/sql_select.cc:20579(end_send(JOIN*, st_join_table*, bool))[0x5617cae029d8]

sql/sql_select.cc:19441(sub_select(JOIN*, st_join_table*, bool))[0x5617cadf893c]

sql/sql_class.h:3872(THD::get_stmt_da())[0x5617cae026de]

sql/sql_select.cc:19403(sub_select(JOIN*, st_join_table*, bool))[0x5617cadf893c]

sql/sql_class.h:3872(THD::get_stmt_da())[0x5617cae026de]

sql/sql_select.cc:19403(sub_select(JOIN*, st_join_table*, bool))[0x5617cadf893c]

sql/sql_class.h:3872(THD::get_stmt_da())[0x5617cae026de]

sql/sql_select.cc:19403(sub_select(JOIN*, st_join_table*, bool))[0x5617cadf893c]

sql/sql_class.h:3872(THD::get_stmt_da())[0x5617cae026de]

sql/sql_select.cc:19403(sub_select(JOIN*, st_join_table*, bool))[0x5617cadf893c]

sql/sql_class.h:3872(THD::get_stmt_da())[0x5617cae0273c]

sql/sql_select.cc:19403(sub_select(JOIN*, st_join_table*, bool))[0x5617cadf893c]

sql/sql_class.h:3872(THD::get_stmt_da())[0x5617cae026de]

sql/sql_select.cc:19403(sub_select(JOIN*, st_join_table*, bool))[0x5617cadf893c]

sql/sql_class.h:3872(THD::get_stmt_da())[0x5617cae0273c]

sql/sql_select.cc:19403(sub_select(JOIN*, st_join_table*, bool))[0x5617cae23e5b]

sql/sql_select.cc:18936(do_select)[0x5617cae24073]

sql/sql_select.cc:3835(JOIN::exec())[0x5617cae666d4]

sql/sql_union.cc:1470(st_select_lex_unit::exec())[0x5617cae69172]

sql/sql_union.cc:41(mysql_union(THD*, LEX*, select_result*, st_select_lex_unit*, unsigned long))[0x5617cae24b75]

sql/sql_class.h:3862(handle_select(THD*, LEX*, select_result*, unsigned long))[0x5617cadd19bd]

sql/sql_parse.cc:4837(mysql_execute_command(THD*))[0x5617cadd349c]

sql/sql_parse.cc:8095(mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool))[0x5617cb09e42a]

sql/log_event.cc:5681(Query_log_event::do_apply_event(rpl_group_info*, char const*, unsigned int))[0x5617cad29ea3]

sql/log_event.h:1483(Log_event::apply_event(rpl_group_info*))[0x5617cad336db]

/lib64/libpthread.so.0(+0x7dd5)[0x7f9c2968add5]

/lib64/libc.so.6(clone+0x6d)[0x7f9c28daaead]

Trying to get some variables.

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

Query (0x7f88e47537e0): SET  @V_Communication_Channel_R = concat(@V_Email,@V_SMS,@V_PN,@V_WhatsApp)

Connection ID (thread ID): 16

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=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

information that should help you find out what is causing the crash.