*Galera Cluster was crashed down, when one record was concurrently updating from many connections.
*
*Table description
create table notice(
id int auto_increment,
host_id varchar(50),
mdate datetime,
primary key(id));

*Only 3 record was inserted
insert into notice(host_id, mdate) values(concat(@@hostname, '--', connection_id(), '--', now()), now());
insert into notice(host_id, mdate) values(concat(@@hostname, '--', connection_id(), '--', now()), now());
insert into notice(host_id, mdate) values(concat(@@hostname, '--', connection_id(), '--', now()), now());

*30 connections(3*10 connection) were issuing below same query.
update notice set host_id = concat(@@hostname, '--', connection_id(), '--', now()) where id = 4;

*set global wsrep_retry_autocommit=30;

*Error Log is like below.

mysqld: /home/buildbot/buildbot/build/wsrep-lib/src/client_state.cpp:232: int wsrep::client_state::after_statement(): Assertion `transaction_.state() == wsrep::transaction::s_aborted' failed.
190705 17:28:21 [ERROR] mysqld got signal 6 ;
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: 10.4.6-MariaDB-log
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=11
max_threads=153
thread_count=20
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467732 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7fd6d404e008
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 = 0x7fd6e41c9eb0 thread_stack 0x49000
/GALERA/galera/bin/mysqld(my_print_stacktrace+0x2b)[0x561df71ce93b]
/GALERA/galera/bin/mysqld(handle_fatal_signal+0x4b7)[0x561df6c2f737]
sigaction.c:0(__restore_rt)[0x7fd6f89276d0]
:0(__GI_raise)[0x7fd6f7d73277]
:0(__GI_abort)[0x7fd6f7d74968]
:0(__assert_fail_base)[0x7fd6f7d6c096]
:0(_GI__assert_fail)[0x7fd6f7d6c142]
/GALERA/galera/bin/mysqld(_ZN5wsrep12client_state15after_statementEv+0x1bc)[0x561df72586ec]
src/client_state.cpp:258(wsrep::client_state::after_statement())[0x561df69b0bcc]
sql/wsrep_trans_observer.h:385(wsrep_after_statement)[0x561df69b77a4]
sql/sp_head.cc:3514(sp_instr_stmt::execute(THD*, unsigned int*))[0x561df69b7fc9]
sql/sp_head.cc:1348(sp_head::execute(THD*, bool))[0x561df69b42b4]
sql/sp_head.cc:1758(sp_head::execute_trigger(THD*, st_mysql_const_lex_string const*, st_mysql_const_lex_string const*, st_grant_info*))[0x561df69b4a92]
sql/sql_trigger.cc:2203(Table_triggers_list::process_triggers(THD*, trg_event_type, trg_action_time_type, bool))[0x561df6ad7cae]
sql/sql_update.cc:1101(mysql_update(THD*, TABLE_LIST*, List<Item>&, List<Item>&, Item*, unsigned int, st_order*, unsigned long long, bool, unsigned long long*, unsigned long long*))[0x561df6ae48d0]
sql/sql_parse.cc:4365(mysql_execute_command(THD*))[0x561df6a49dde]
sql/sql_parse.cc:10013(mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool))[0x561df6a4c5e1]
sql/sql_class.h:3881(THD::get_stmt_da())[0x561df6a4c76a]
sql/sql_parse.cc:1813(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool))[0x561df6a4ee44]
sql/sql_parse.cc:1362(do_command(THD*))[0x561df6a4f561]
sql/sql_connect.cc:1403(do_handle_one_connection(CONNECT*))[0x561df6b1e87f]
sql/sql_connect.cc:1308(handle_one_connection)[0x561df6b1e9c4]
pthread_create.c:0(start_thread)[0x7fd6f891fe25]
/lib64/libc.so.6(clone+0x6d)[0x7fd6f7e3bbad]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7fd6d42ef270): is an invalid pointer
Connection ID (thread ID): 16
Status: KILL_QUERY

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

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.

We think the query pointer is invalid, but we will try to print it anyway.
Query: insert into notice_log(hostname, connection_id, time) values(@@hostname, connection_id(), now())

Writing a core file...
Working directory at /GALERA_DATA/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 3802 3802 processes
Max open files 65535 65535 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 3802 3802 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