Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: 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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