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Bug#1139740: linux-image-7.0.12+deb14-amd64: NULL pointer dereference in nouveau / black screen

Cross-posted to 2 groups.

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On 2026-06-12 11:27:10 +0200, Vincent Lefevre wrote:
> The 7.0.12 kernel is unusable (except via SSH) due to a NULL pointer
> dereference in nouveau. The first one:
[...]

> I get a black screen.

... with a small "_" cursor at the top-left.

The initrd is much smaller than the one of the 7.0.10 kernel
(which is still working fine):

-rw-r--r-- 1 root root 182262716 2026-06-01 16:55:19 initrd.img-7.0.10+deb14-amd64
-rw-r--r-- 1 root root  76734406 2026-06-12 11:14:18 initrd.img-7.0.12+deb14-amd64

This may be due to the new version of firmware-nonfree.

Before (used with the 7.0.10 kernel):

ii  firmware-intel-graphics               20260410-1                           all          Binary firmware for Intel iGPUs and IPUs
ii  firmware-intel-misc                   20260410-1                           all          Binary firmware for miscellaneous Intel devices and chips
ii  firmware-mediatek                     20260410-1                           all          Binary firmware for MediaTek and Ralink chips for networking, SoCs and media
ii  firmware-misc-nonfree                 20260410-1                           all          Binary firmware for various drivers in the Linux kernel
ii  firmware-nvidia-graphics              20260410-1                           all          Binary firmware for Nvidia GPU chips
ii  firmware-realtek                      20260410-1                           all          Binary firmware for Realtek network and audio chips

Now (used with the 7.0.12 kernel):

ii  firmware-misc-nonfree                 20260519-1                           all          Binary firmware for various drivers in the Linux kernel
ii  firmware-realtek                      20260519-1                           all          Binary firmware for Realtek network and audio chips

since firmware-nvidia-graphics, firmware-intel-graphics,
firmware-intel-misc, firmware-mediatek have been changed
from "Recommends:" to "Suggests:". If this is an issue
just to be able to run Xorg, this should be reverted.

If this is the cause, note that I have another machine, also with
an Nvidia graphics card, but just with firmware-linux-free, and
everything is fine (however, on this other machine, I use the
proprietary Nvidia drivers instead of nouveau due to an old bug
that has never been fixed, and the initrd size is also reasonable:
79278149, i.e. similar to the initrd.img-7.0.12+deb14-amd64 one
mentioned above).

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)

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Bug#1139740: linux-image-7.0.12+deb14-amd64: NULL pointer dereference in nouveau / black screen Vincent Lefevre <vincent@vinc17.net> - 2026-06-12 12:50 +0200
  Bug#1139740: linux-image-7.0.12+deb14-amd64: NULL pointer dereference in nouveau / black screen Vincent Lefevre <vincent@vinc17.net> - 2026-06-12 13:20 +0200
    Processed: Re: linux-image-7.0.12+deb14-amd64: NULL pointer  dereference in nouveau / black screen "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-06-12 13:20 +0200
    Bug#1139740: linux-image-7.0.12+deb14-amd64: NULL pointer dereference in nouveau / black screen Vincent Lefevre <vincent@vinc17.net> - 2026-06-12 13:40 +0200
      Bug#1139740: linux-image-7.0.12+deb14-amd64: NULL pointer dereference in nouveau / black screen Ben Hutchings <ben@decadent.org.uk> - 2026-06-12 18:30 +0200
  Bug#1139740: linux-image-7.0.12+deb14-amd64: NULL pointer dereference in nouveau / black screen Ben Hutchings <ben@decadent.org.uk> - 2026-06-12 18:20 +0200
    Bug#1139740: linux-image-7.0.12+deb14-amd64: NULL pointer dereference in nouveau / black screen Ben Hutchings <ben@decadent.org.uk> - 2026-06-21 22:20 +0200
      Bug#1139740: linux-image-7.0.12+deb14-amd64: NULL pointer dereference in nouveau / black screen Vincent Lefevre <vincent@vinc17.net> - 2026-06-21 23:40 +0200

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