The bug is ubuntu's :
it is a patch picked from stable and backported #2074091
to quote Ubuntu's own explaination :
SRU Justification
Impact:
The upstream process for stable tree updates is quite similar
in scope to the Ubuntu SRU process, e.g., each patch has to
demonstrably fix a bug, and each patch is vetted by upstream
by originating either directly from a mainline/stable Linux tree or
a minimally backported form of that patch. The following upstream
stable patches should be included in the Ubuntu kernel:
upstream stable patchset 2024-07-25
Ported from the following upstream stable releases:
v6.6.35, v6.9.6
The offending patch (backported wihtout seeing it will breeak partner's
code) :
- drm/mst: Fix NULL pointer dereference at drm_dp_add_payload_part2
<---- This is the one
I don't know why i use dkms, AMD is an Ubuntu partner, i use Rocm and
wanted to use 6.2 , for other reasons my computer need kernel >6.5 , and
mesa >23.0 , so upgrade to ubuntu 24.04 seemed a good choice (instead of
hwe + other stuff)
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https://bugs.launchpad.net/bugs/2080823
Title:
6.8.0-44 breaks amdgpu-dkms 6.8.5
Status in linux package in Ubuntu:
Won't Fix
Bug description:
Ubuntu 24.04.1
6.8.0-44 causes compile failure of amdgpu-dkms (6.8.5 from AMD
partner)
```
linux-image-generic 6.8.0-44.44
amd64 Generic Linux kernel image
amdgpu-dkms 1:6.8.5.60200-2009582.24.04 amdgpu driver
in DKMS format.
noble/main
amdgpu-dkms-firmware 1:6.8.5.60200-2009582.24.04 firmware blobs
used by amdgpu driver in DKMS format
noble/main
```
The 6.8.0-44 kernel includes :
* Noble update: upstream stable patchset 2024-07-25 (LP: #2074091)
- drm/mst: Fix NULL pointer dereference at
drm_dp_add_payload_part2 <---- This is the one
This one causes a compile failure in amdgpu-dkms 6.8.5 , detected
from rocm6.2 users and initially reported there, but i believe it
should be fixed in Ubuntu who backported the fix causing the bug.
https://github.com/ROCm/ROCm/issues/3701
https://github.com/ROCm/ROCm/issues/3701#issuecomment-2351247361
contains a trivial patch on the amdgpu-dkms side, but the problem is
introduced by a patch on the kernel ubuntu-6.8.
this is very annoying, and proposed workaround on github Amd Rocm are
a bit weird (even if they work well)
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