SLES Virtual machine stucks during boot

i have a SLES 12 SP3 Virtual Domian running in a SLES 12 SP4 HA-Cluster (pacemaker, corosync).
Occasionally the domains stucks during boot, the boot screen hangs in D-Bus.
I don’t have any clue why.
I attached the log from the failed boot, maybe you can have a look and give me a hint.