2021-02-15 21:18:02 0 [ERROR] [FATAL] InnoDB: Semaphore wait has lasted > 600 seconds. We intentionally crash the server because it appears to be hung.

210215 21:18:02 [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: 10.5.7-MariaDB-log

key_buffer_size=16777216

read_buffer_size=131072

max_used_connections=25

max_threads=1002

thread_count=21

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 2222136 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

Can't start addr2line

/usr/sbin/mariadbd(my_print_stacktrace+0x2e)[0x55d8bcf1a12e]

/usr/sbin/mariadbd(handle_fatal_signal+0x307)[0x55d8bc928fd7]

/lib64/libpthread.so.0(+0xf630)[0x7f5fe0964630]

/lib64/libc.so.6(gsignal+0x37)[0x7f5fde9be387]

/lib64/libc.so.6(abort+0x148)[0x7f5fde9bfa78]

/usr/sbin/mariadbd(+0xdb8020)[0x55d8bcd71020]

/usr/sbin/mariadbd(+0xd64019)[0x55d8bcd1d019]

/usr/sbin/mariadbd(_ZN5tpool19thread_pool_generic13timer_generic7executeEPv+0x35)[0x55d8bcea2c45]

/usr/sbin/mariadbd(_ZN5tpool4task7executeEv+0x2b)[0x55d8bcea3d7b]

/usr/sbin/mariadbd(_ZN5tpool19thread_pool_generic11worker_mainEPNS_11worker_dataE+0x61)[0x55d8bcea21f1]

/lib64/libstdc++.so.6(+0xb5070)[0x7f5fdf10d070]

/lib64/libpthread.so.0(+0x7ea5)[0x7f5fe095cea5]

/lib64/libc.so.6(clone+0x6d)[0x7f5fdea868dd]

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 /var/lib/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             127923               127923               processes 

Max open files            16384                16384                files     

Max locked memory         65536                65536                bytes     

Max address space         unlimited            unlimited            bytes     

Max file locks            unlimited            unlimited            locks     

Max pending signals       127923               127923               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