Just had a system hang on 18.04 due to this. The hangs are definitely
much rarer, but do happen.

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  System hangs after iwlwifi firmware crash

Status in linux-firmware package in Ubuntu:

Bug description:
  Since upgrading to Kubuntu 17.10 my HP EliteBook 820 G3 hangs at
  unpredictable times. I have experienced probably 20 hangs. Once the
  system is hung no mouse movement, NumLock toggle, VT switch,
  Ctrl+Alt+Del, SysRq keys, SSH attempts have any effect whatsoever. Any
  audio playing is stuck looping in the hardware buffer. The system is
  really stuck. Only the keyboard backlight is still responsive.

  The only correlation I have noticed is that the system only hangs if
  WiFi is enabled. This morning I experienced two hangs in ten minutes
  necessitating reboots. Having disabled WiFi the system has been stable
  since ~1100 (~5 hours).

  Often, I see a iwlwifi hardware reset in the logs before the system

  /var/log/syslog:Oct 30 11:49:30 fry kernel: [ 6529.550751] iwlwifi
  0000:02:00.0: Microcode SW error detected.  Restarting 0x82000000.

  (apport has hopefully uploaded the full log, please lmk if not).
  Sometimes the message doesn't make it into the logs, and ext4
  truncates the file at the next mount.

  There seems to be no correlation with any messages immediately before
  the wifi chip dies. It doesn't seem to matter whether I'm at home or
  at work. I have wired ethernet at work simultaneously with wifi, but
  the wifi provides IPv6 so I would imagine most traffic uses wifi, so
  it's hard to say whether there's any effect of the traffic load on the
  probability of failure.

  Here is a sample of the firmware load:

  /var/log/syslog.5.gz:Oct 24 15:37:26 fry kernel: [    7.604743] iwlwifi 
0000:02:00.0: enabling device (0000 -> 0002)
  /var/log/syslog.5.gz:Oct 24 15:37:26 fry kernel: [    7.611790] iwlwifi 
0000:02:00.0: Direct firmware load for iwlwifi-8000C-33.ucode failed with error 
  /var/log/syslog.5.gz:Oct 24 15:37:26 fry kernel: [    7.611930] iwlwifi 
0000:02:00.0: Direct firmware load for iwlwifi-8000C-32.ucode failed with error 
  /var/log/syslog.5.gz:Oct 24 15:37:26 fry kernel: [    7.620028] iwlwifi 
0000:02:00.0: loaded firmware version 31.532993.0 op_mode iwlmvm
  /var/log/syslog.5.gz:Oct 24 15:37:26 fry kernel: [    7.650972] iwlwifi 
0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208

  02:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)

  Any help appreciated.


  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: xorg 1:7.7+19ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  CompositorRunning: None
  CurrentDesktop: KDE
  Date: Mon Oct 30 16:15:43 2017
  DistUpgraded: 2017-10-15 14:47:25,517 DEBUG Running PostInstallScript: 
  DistroCodename: artful
  DistroVariant: kubuntu
   Intel Corporation HD Graphics 520 [8086:1916] (rev 07) (prog-if 00 [VGA 
     Subsystem: Hewlett-Packard Company HD Graphics 520 [103c:807c]
  InstallationDate: Installed on 2016-09-09 (416 days ago)
  InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
  MachineType: HP HP EliteBook 820 G3
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-generic.efi.signed 
root=/dev/mapper/kubuntu--vg-root ro
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to artful on 2017-10-15 (15 days ago)
  dmi.bios.date: 11/01/2016
  dmi.bios.vendor: HP
  dmi.bios.version: N75 Ver. 01.13
  dmi.board.name: 807C
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 85.74
  dmi.chassis.asset.tag: 5CG6354JW5
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
  dmi.product.name: HP EliteBook 820 G3
  dmi.sys.vendor: HP
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.83-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.2-0ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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