Crashes server with segfault during role gratns

Server version: 10.2.21-MariaDB-log

key_buffer_size=134217728

read_buffer_size=131072

max_used_connections=0

max_threads=502

thread_count=9

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1234101 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x55a049a67238

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 = 0x7ffe71dc70c0 thread_stack 0x49000

/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x55a0473d3dbe]

mysys/stacktrace.c:268(my_print_stacktrace)[0x55a046e5aec5]

sigaction.c:0(__restore_rt)[0x7f5fcf2c35d0]

:0(__strcmp_sse42)[0x7f5fcd69f01a]

/usr/sbin/mysqld(+0x47cc42)[0x55a046c68c42]

sql/sql_acl.cc:5946(merge_role_db_privileges)[0x55a046c5b80d]

sql/sql_acl.cc:5717(traverse_role_graph_impl(ACL_USER_BASE*, void*, long, int (*)(ACL_USER_BASE*, void*), int (*)(ACL_USER_BASE*, ACL_ROLE*, void*)) [clone .constprop.293])[0x55a046c5ba14]

mysys/hash.c:796(my_hash_iterate)[0x55a0473b1d4c]

sql/sql_acl.cc:7493(grant_reload(THD*))[0x55a046c6a730]

sql/sql_acl.cc:7248(grant_init())[0x55a046c6aa03]

sql/mysqld.cc:5947(mysqld_main(int, char**))[0x55a046c38aec]

/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f5fcd5833d5]

/usr/sbin/mysqld(+0x4403fd)[0x55a046c2c3fd]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x0): 

Connection ID (thread ID): 0

Status: NOT_KILLED

90121 13:13:57 server_audit: logging started to the file /opt/mariadb/log/mariadb/server_audit_s00249177uv.ads.provinzial.com.log.

2019-01-21 13:13:57 0 [Note] Server socket created on IP: '::'.

190121 13:13:57 [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: 10.3.12-MariaDB-log

key_buffer_size=134217728

read_buffer_size=131072

max_used_connections=0

max_threads=502

thread_count=9

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1234594 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x560bf08e1618

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 = 0x7fff5f5ee620 thread_stack 0x49000

/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x560bd9180d1e]

/usr/sbin/mysqld(handle_fatal_signal+0x357)[0x560bd8c21d97]

/lib64/libpthread.so.0(+0xf5d0)[0x7fd0a5d285d0]

/lib64/libc.so.6(+0x13e01a)[0x7fd0a410401a]

/usr/sbin/mysqld(+0x534b72)[0x560bd89dbb72]

/usr/sbin/mysqld(+0x526fbd)[0x560bd89cdfbd]

/usr/sbin/mysqld(+0x5271d4)[0x560bd89ce1d4]

/usr/sbin/mysqld(my_hash_iterate+0x4c)[0x560bd915eaec]

/usr/sbin/mysqld(_Z12grant_reloadP3THD+0xd27)[0x560bd89ddb07]

/usr/sbin/mysqld(_Z10grant_initv+0x55)[0x560bd89dddf5]

/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0xc5c)[0x560bd89989dc]

/lib64/libc.so.6(__libc_start_main+0xf5)[0x7fd0a3fe83d5]

/usr/sbin/mysqld(+0x4e476d)[0x560bd898b76d]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x0): 

Connection ID (thread ID): 0

Status: NOT_KILLED

Optimizer switch: