Out of curiosity, can you link me to the upstream git repo for
http://kernsec.org/pipermail/linux-security-module-
archive/2017-December/004638.html? I want to be sure I'm looking at the
right place.

Interestingly, it looks like someone replied to your patch saying they
would incorporate it in early December, so it seems this bug fell
through the cracks more than once.

Joseph Salisbury is subscribed to this bug and has commented on it
above, so hopefully he will update regarding this when he gets a chance.

This seems like a really simple fix, so I'm actually going to see if I
can recompile 4.13.0-25-generic with this patch added to make it work.

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https://bugs.launchpad.net/bugs/1742572

Title:
  System Hangs and General Protection Fault Occurs following NFS Access

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Last night, in an attempt to secure my system against
  Meltdown/Spectre, I upgraded from Zesty to Artful. Upon booting into
  the latest kernel, my system would immediately hang and fail to
  respond (including to SysRq commands).

  Both this (my primary) system and an Intel NUC (which were both
  upgraded from Zesty to Artful at the same time) export NFS shares to
  one other. The NUC appears to be error-free, but my primary system
  seems to crash whenever I attempt to access the NFS share of NUC.

  As I have not tried any other kernel releases in either system other
  than 4.13.0-25.29, it's impossible for me to say if this is an issue
  regarding the recent security patch, or if it is some other issue.

  Attached is the console log (obtained via netconsole) which includes
  the kernel trace of the error.

  Please let me know if further information is required or if I can help
  further in troubleshooting.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-25-generic 4.13.0-25.29
  ProcVersionSignature: Ubuntu 4.10.0-42.46-generic 4.10.17
  Uname: Linux 4.10.0-42-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  mvastola   4661 F.... pulseaudio
   /dev/snd/controlC1:  mvastola   4661 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Wed Jan 10 18:18:52 2018
  InstallationDate: Installed on 2012-01-06 (2196 days ago)
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  IwConfig:
   lo        no wireless extensions.

   mike      no wireless extensions.

   docker0   no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. GA-990XA-UD3
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-42-generic 
root=/dev/mapper/VastDesk-RootOS ro apparmor=0 
netconsole=4444@10.12.1.55/mike,4444@10.12.1.1/8c:ae:4c:f4:83:1a 
crashkernel=384M-:128M crashkernel=384M-:128M
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-42-generic N/A
   linux-backports-modules-4.10.0-42-generic  N/A
   linux-firmware                             1.169.1
  RfKill:
   0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2014-12-03 (1134 days ago)
  dmi.bios.date: 09/09/2014
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F14e
  dmi.board.name: GA-990XA-UD3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF14e:bd09/09/2014:svnGigabyteTechnologyCo.,Ltd.:pnGA-990XA-UD3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-990XA-UD3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-990XA-UD3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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