title: mariadb.service: Failed with result 'signal'
body: <p>Since today morning I have a problem with the mariadb.service running on Ubuntu 18.04 with Plesk. It stopped and I can't restart it again.</p>
  
  <pre><code>service mysqld start
  Job for mariadb.service failed because a fatal signal was delivered to the control process.
  See "systemctl status mariadb.service" and "journalctl -xe" for details.
  </code></pre>
  
  <pre><code>systemctl status mariadb.service
  ● mariadb.service - MariaDB 10.2.27 database server
     Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
    Drop-In: /etc/systemd/system/mariadb.service.d
             └─migrated-from-my.cnf-settings.conf
     Active: activating (auto-restart) (Result: signal) since Thu 2019-10-24 21:14:25 CEST; 3s ago
       Docs: man:mysqld(8)
             https://mariadb.com/kb/en/library/systemd/
    Process: 26703 ExecStartPost=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
    Process: 26699 ExecStartPost=/etc/mysql/debian-start (code=exited, status=0/SUCCESS)
    Process: 26932 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=killed, signal=ABRT)
    Process: 26717 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] &amp;&amp; VAR= ||   VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ]   &amp;&amp; systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (co
    Process: 26715 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
    Process: 26714 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld (code=exited, status=0/SUCCESS)
   Main PID: 26932 (code=killed, signal=ABRT)
  
  Okt 24 18:21:40 XXXXX systemd[1]: mariadb.service: Failed with result 'signal'.
  Okt 24 18:21:40 XXXXX systemd[1]: Failed to start MariaDB 10.2.27 database server.
  Okt 24 18:21:45 XXXXX systemd[1]: mariadb.service: Service hold-off time over, scheduling restart.
  Okt 24 18:21:45 XXXXX systemd[1]: mariadb.service: Scheduled restart job, restart counter is at 1251.
  Okt 24 18:21:45 XXXXX systemd[1]: Stopped MariaDB 10.2.27 database server.
  Okt 24 18:21:45 XXXXX systemd[1]: Starting MariaDB 10.2.27 database server...
  Okt 24 18:21:46 XXXXX mysqld[22593]: 2019-10-24 18:21:46 140599485605184 [Note] /usr/sbin/mysqld (mysqld 10.2.27-MariaDB-1:10.2.27+maria~bionic) starting as process 22593 ...
  Okt 24 18:21:47 XXXXX systemd[1]: mariadb.service: Main process exited, code=killed, status=6/ABRT
  Okt 24 18:21:47 XXXXX systemd[1]: mariadb.service: Failed with result 'signal'.
  Okt 24 18:21:47 XXXXX systemd[1]: Stopped MariaDB 10.2.27 database server.
  </code></pre>
  
  <p>I already tried the following things:</p>
  
  <ul>
  <li>server restart</li>
  <li><a href="https://stackoverflow.com/questions/40997257/mysql-service-fails-to-start-hangs-up-timeout-ubuntu-mariadb">mysql service fails to start/hangs up - timeout (Ubuntu, MariaDB)</a></li>
  <li><a href="https://help.univention.com/t/problem-mysql-server-does-not-start-any-more/10010" rel="noreferrer">https://help.univention.com/t/problem-mysql-server-does-not-start-any-more/10010</a></li>
  </ul>
  
  <p>How can I get mariadb running again?</p>