Re: Kernel upgrade = freeze on boot (linux-image-4.16.0-2-amd64)

[Guillaume Clercin <gclercin@intellique.com>]

Le lundi 2 juillet 2018, 01:06:10 CEST Carl Fink a écrit :
> So, on a Testing system, linux-image-4.16.0-2-amd64 came up in the apt
> 
> queue. I installed it and rebooted.
> My system froze on reboot. Scrolled through the boot messages on the
> console, up to X starting, then this (warning, long excerpt from syslog):
> ...
> Jul 1 18:50:09 debian-nitpicking kernel: [ 7.399065] usercopy: Kernel
> memory exposure attempt detected from SLUB object 'nvidia_stack_cache'
> (offset 11440, size 3)!
> ...
You need to update "/etc/default/grub" and add parameter to boot with. In this 
file, you need to edit the line starting with GRUB_CMDLINE_LINUX and append 
option: "slab_common.usercopy_fallback=y". This workaround was suggested by 
nvidia maintainer. Don't forget to run "update-grub" after.

nvidia-graphics-drivers (390.67-1) unstable; urgency=medium

  For using the NVIDIA driver on Linux 4.16.16-1 or newer, the following
  kernel boot option may be needed as a workaround for #901919:
    slab_common.usercopy_fallback=y
  See https://bugs.debian.org/901919 for details.

 -- Andreas Beckmann <anbe@debian.org>  Thu, 28 Jun 2018 12:32:19 +0200

This workaround works fine for me. Currently, I'm using nvidia-driver 
(390.67-1) and Linux (4.16.0-2-amd64).

Guillaume Clercin

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