Public bug reported:

############################

sudo systemctl stop mariadb

# needs to be fast, do not sleep more than 1 sec

sudo systemctl start mariadb

# delay does not matter

sudo systemctl disable mariadb

# delay does not matter

sudo systemctl enable mariadb

# delay does not matter

sudo systemctl status mariadb

############################

Here the service starts showing the infamous

############################

● mariadb.service - MariaDB 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: inactive (dead) since Wed 2015-10-14 15:04:58 UTC; 58s ago
  Main PID: 880 (mysqld)
    Status: "Taking your SQL requests now..."
    CGroup: /system.slice/mariadb.service
            └─880 /usr/sbin/mysqld

############################

If I then shut down the MariaDB server, e.g. via the shutdown command 
(or just SIGTERM the process), I get

############################

Broadcast message from systemd-journald@ubuntu-vivid-amd64 (Wed 
2015-10-14 15:14:18 UTC):

systemd[1]: Caught <ABRT>, dumped core as pid 960.


Broadcast message from systemd-journald@ubuntu-vivid-amd64 (Wed 
2015-10-14 15:14:18 UTC):

systemd[1]: Freezing execution.

############################

systemd:

ii  libpam-systemd:amd64                219-7ubuntu3 
amd64        system and service manager - PAM module
ii  libsystemd0:amd64                   219-7ubuntu3 
amd64        systemd utility library
ii  systemd                             219-7ubuntu3 
amd64        system and service manager
ii  systemd-sysv                        219-7ubuntu3 
amd64        system and service manager - SysV links


with also occurs on Redhat - backtrace: 
https://bugzilla.redhat.com/show_bug.cgi?id=1271832

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1506206

Title:
  systemd abort

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