@paelzer,

glad to see you reproduce the problem successfully,
and simulate by creating nested KVM is better the my test, thanks

here I would like to add more history for this bug report,
* it is running under KVM with multiple instance
* it is ungracefully shut-down (could be simulated by virsh if test under 
nested KVM, or kill)
* disk for physical host is running under RAID-1
* disk for physical host is formatted with 2-partition, / and /boot
* one of the KVM instance running with 2 vHDD, partition: / and /data
* * the /data is mounted as data volume for DB (yeah, it is reading/writing all 
the time)


as for the patch in the PPA above,
let's focus on libvirt-related section only,
I would prefer to keep sleep interval short (1s),
see discussion #14 ~ #16 above,

consider the following scenario,
if under a slow environment, waiting for socket ready required 65s,
but due to the loop with incremental condition, it will required 91s, there's 
26s wasted
(1s + 2s + 4s + 8s + 16s + 30s + 30s = 91s)

and the worst case,
it will lead to 29s wasted. it is slowing down boot up speed,
I think it's not a good user experience, although it is no harm for system.


BTW,
I saw you marked Xenial/Zesty/Artful as Fixed Released in #26, #27
does it mean test#35 all passed for Xenial/Zesty/Artful?

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https://bugs.launchpad.net/bugs/1571209

Title:
  Sockfile check retries too short for a busy system boot

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