The bug reporter in bug 1713751 has been unable to reproduce the bug
with the 4.13.0-16-generic kernel.  He's re-testing with the original
kernel that exhibited the bug to ensure he can reproduce it
consistently.  If he finds that 4.13.0-16-generic is really good he
really might be hitting a different bug.  I'll update this bug with that
answer.

laney, we could start a bisect in this bug at the same time if you want.
The first thing we would have to do is identify the last "Good" Ubuntu
kernel and first "Bad" Ubuntu kernel.  That would mean trying some of
the earlier 4.13 kernels, based on that, some 4.12 kernels, etc.  Bug
1713751 suggests that he is unable to reproduce the bug with 4.10.0-33,
so maybe you could try that one next?  It's available from:

https://launchpad.net/~canonical-kernel-
team/+archive/ubuntu/ppa/+build/13234886

Based on what you see with that, we can decide jump to the middle of the
versions and try a 4.11 or 4.12 based kernel?


** Changed in: linux (Ubuntu Artful)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Artful)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Bionic)
       Status: Triaged => In Progress

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Also affects: qemu-kvm (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Zesty)
       Status: New => Incomplete

** Changed in: linux (Ubuntu Zesty)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Zesty)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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https://bugs.launchpad.net/bugs/1730717

Title:
  Some VMs fail to reboot with "watchdog: BUG: soft lockup - CPU#0 stuck
  for 22s! [systemd:1]"

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