Can you see if the bug happens with and of these mainline kernels?  We
can perform a kernel bisect if we can narrow down to the last good
kernel version and first bad one:

v4.14 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14/
v4.15-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/
v4.15-rc4: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc4/
v4.15 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15/

You don't have to test every kernel, just up until the kernel that first
has this bug.

Thanks in advance!

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

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

** Also affects: linux (Ubuntu Bionic)
   Importance: Critical
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
       Status: Triaged

** Tags added: kernel-key

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https://bugs.launchpad.net/bugs/1762844

Title:
  ISST-LTE:KVM:Ubuntu1804:BostonLC:boslcp3: Host crashed & enters into
  xmon after moving to 4.15.0-15.16 kernel

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