2021-09-09 15:27:05 0 [ERROR] WSREP: Trx 19864615745 tries to abort slave trx 19864615747. This could be caused by:
	1) unsupported configuration options combination, please check documentation.
	2) a bug in the code.
	3) a database corruption.
 Node consistency compromized, need to abort. Restart the node to resync with cluster.
210909 15:27:05 [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: 10.3.31-MariaDB-0ubuntu0.20.04.1
key_buffer_size=33554432
read_buffer_size=131072
max_used_connections=95
max_threads=502
thread_count=117
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1136419 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
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 = 0x0 thread_stack 0x49000
/usr/sbin/mysqld(my_print_stacktrace+0x32)[0x564c3d994472]
/usr/sbin/mysqld(handle_fatal_signal+0x55d)[0x564c3d48a46d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x153c0)[0x7f2de20af3c0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xcb)[0x7f2de1eee18b]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x12b)[0x7f2de1ecd859]
/usr/sbin/mysqld(+0x96ec48)[0x564c3d627c48]
/usr/sbin/mysqld(+0x96f83a)[0x564c3d62883a]
/usr/sbin/mysqld(handle_manager+0x17e)[0x564c3d2910fe]
/usr/sbin/mysqld(+0xc62746)[0x564c3d91b746]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x9609)[0x7f2de20a3609]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x43)[0x7f2de1fca293]
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 /data/mysql
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             127272               127272               processes 
Max open files            65000                65000                files     
Max locked memory         65536                65536                bytes     
Max address space         unlimited            unlimited            bytes     
Max file locks            unlimited            unlimited            locks     
Max pending signals       127272               127272               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