Assertion failure in file storage/innobase/log/log0log.cc line 631 (signal 6)

2021-01-16 12:16:31 0xb3b3e0f00 InnoDB: Assertion failure in file storage/innobase/log/log0log.cc line 631
InnoDB: Failing assertion: lsn >= log_sys.get_flushed_lsn()
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to https://jira.mariadb.org/
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: https://mariadb.com/kb/en/library/innodb-recovery-modes/
InnoDB: about forcing recovery.
210116 12:16:31 [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: 10.5.8-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=53
max_threads=102
thread_count=55
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 355401 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0xb431f78d8
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 = 0x7fffdc509f38 thread_stack 0x49000
0x129f5ec <my_print_stacktrace+0x3c> at /usr/local/libexec/mariadbd
0xc3911e <handle_fatal_signal+0x28e> at /usr/local/libexec/mariadbd
0x801983b70 <_pthread_sigmask+0x530> at /lib/libthr.so.3
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0xb49110fb0): RENAME TABLE `items_prices` TO `items_prices_old`, `items_prices_new` TO `items_prices`

Connection ID (thread ID): 1974000
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,i

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.