Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.15 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:

Once testing of the upstream kernel is complete, please mark this bug as

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15

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

** Tags added: pti

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

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

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

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

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  [v4.13,mlx5_core] Oops: 0000 [#1] SMP PTI

Status in linux package in Ubuntu:
Status in linux source package in Artful:

Bug description:
  PowerEdge R730
  4.13.0-26-generic #29~16.04.2-Ubuntu
  mlx5_core firmware version: 14.20.1820

  kernel trace: https://pastebin.ubuntu.com/26529021/

  Issue happened when I issued "reboot" command. Other nodes with same
  specifications and software versions didn't hit this bug.

  A new "reboot" on the node that panic'ed didn't hit the bug.

  I've set "pti=off" on all of them for now.
   total 0
   crw-rw---- 1 root audio 116,  1 Feb  5 13:07 seq
   crw-rw---- 1 root audio 116, 33 Feb  5 13:07 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  IwConfig: Error: [Errno 2] No such file or directory
   Bus 002 Device 002: ID 8087:8002 Intel Corp. 
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 413c:a001 Dell Computer Corp. Hub
   Bus 001 Device 002: ID 8087:800a Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. PowerEdge R730
  Package: linux (not installed)
  ProcFB: 0 mgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed 
root=UUID=2344957a-f5ed-46a7-87a5-255ab83876fb ro console=tty0 
console=ttyS0,115200 console=ttyS1,115200 panic=30 raid=noautodetect 
  ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
   linux-restricted-modules-4.13.0-32-generic N/A
   linux-backports-modules-4.13.0-32-generic  N/A
   linux-firmware                             1.157.14
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial uec-images xenial uec-images
  Uname: Linux 4.13.0-32-generic x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip floppy libvirtd netdev plugdev sudo 
  _MarkForUpload: False
  dmi.bios.date: 09/06/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.2.5
  dmi.board.name: 04N3DF
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A10
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.product.name: PowerEdge R730
  dmi.sys.vendor: Dell Inc.

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