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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1743946

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

** Tags added: artful

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https://bugs.launchpad.net/bugs/1743946

Title:
  kexec reboot = NMI: PCI system error (SERR) for reason a1 on CPU 0

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  On 16.04 with linux-image-lowlatency-hwe-16.04 amd64 (currently
  4.13.0-30-lowlatency) with kexec-tools default-configured to handle
  reboots with the current kernel version (no GRUB detect) and
  /proc/cmdline.

  The system freezes either permanently (requiring a hard power-off) or
  for tens of seconds, showing (copied from a photograph):

  kexec_core: Starting new kernel
  nouveau 0000:01:00.0: DRM: GPU lockup - switching to software fbcon
  NMI: PCI system error (SERR) for reason a1 on CPU 0.
  Dazed and confused, but trying to continue

  Due to the nature of the failure there is no additional logging or
  clues. I tried "nopti" in case recent 'Meltdown' changes were
  responsible but it still happens. I've only just enabled kexec on this
  system so have no historical indications of it having worked.

  System is Dell XPS M1530, Core 2 Duo T9300, 4GB RAM

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