Hello, we are using MariaDB 10.1 in our project. Project is huge, as for me...we migrate from MySQL 5.6 to MariaDB 10.1 to have galera replication. So now, we have:
mysql1
haproxy ==>> mysql2

and mysql3 server for backups. This server not included in haproxy, just backups. And...after migration, everything was fine few weeks, then MariaDB 10.1 starts crashing, same error

170612 3:00:17 [ERROR] mysqld got signal 11 ;

And few days ago, MariaDB 10.2 released, I updated mysql3 server and mysql2, and again receive error. I attach error backtrase.

We are using 14.04.5 LTS
CPU: Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz
RAM: 256Gb
2 SSD drives, 500Gb in software raid.

Same hardware on 3 servers.

Also i include my.cnf

Thank you.