MariaDB Server is Suddenly down

I had Error As Below When i finished Job about configuration.
(heap size, tmp size, bin_log, path for tmp dir)

190825 7:46:24 [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: 10.2.21-MariaDB-log
key_buffer_size=134217728
read_buffer_size=2097152
max_used_connections=167
max_threads=2001
thread_count=38
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 8369814 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7f9418b86008
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 = 0x7f9927d35c38 thread_stack 0x49000

I want to know How i can avoid this Error, and why this problem was occured.