Dear Maintainer,
  Xorg is carshing with a segfault:

(EE) Backtrace:
(EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x139) [0x55c365ce4cf9]
(EE) 1: /lib/x86_64-linux-gnu/libc.so.6 (__sigaction+0x40) [0x7f00ef25af90]
(EE) 2: /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so (nouveau_drm_screen_create+0x4406c) [0x7f00ed75999c]
(EE) 3: /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so (nouveau_drm_screen_create+0x1e4c9) [0x7f00ed733df9]
(EE) 4: /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so (nouveau_drm_screen_create+0x266) [0x7f00ed715b96]
(EE) unw_get_proc_name failed: no unwind info found [-10]
../..
Fatal server error:
(EE) Caught signal 11 (Segmentation fault). Server aborting
(EE)


any workaround meantime? ;-)


Best regards
Christophe

Hi Christophe,

Christophe Lohr wrote:

I think I've run into the same or at least a very similar issue (see
https://bugs.debian.org/1040254, reported against
xserver-xorg-video-nouveau) and my fix was (unfortunately) to switch
from xserver-xorg-video-nouveau to the non-free binary-only driver
xserver-xorg-video-nvidia with nvidia-kernel-dkms.

(Using nvidia-open-kernel-dkms instead of nvidia-kernel-dkms did not
suffice for me as it had other issues, it made X show up on only one
screen and without any xrandr or nvidia-settings capabilities.)

HTH

		Regards, Axel

tried to get some symbols for the given backtrace.


2:   0x00007ffff6b5999c <nouveau_screen_fini+76>: mov    0x20(%rax),%rdi
    in nouveau_pushbuf_destroy at ../src/gallium/drivers/nouveau/nouveau_screen.c:244

3:    0x00007ffff6b33df4 <nvc0_screen_destroy+260>:        call   0x7ffff6b59950 <nouveau_screen_fini>
    in nvc0_screen_destroy at ../src/gallium/drivers/nouveau/nvc0/nvc0_screen.c:740

4:    0x00007ffff6b15b93 <nouveau_drm_screen_create+611>:  call   *0x10(%rax)
    in nouveau_drm_screen_create at ../src/gallium/winsys/nouveau/drm/nouveau_drm_winsys.c:133


An internet search leads to:
https://docs.mesa3d.org/relnotes/22.3.7.html
Sam Edwards (1):
     nouveau: Fix null dereference in nouveau_pushbuf_destroy


So this looks exactly like the place of above frame 2,
and the issue might be fixed by this commit:
https://gitlab.freedesktop.org/mesa/mesa/-/commit/4585f21de47af5e2b1a018a052ac0aaf5f1f3ac5
https://gitlab.freedesktop.org/italove/mesa/-/commit/9de997bde67df43a9e10a05f9b48419ee4cfec25
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21611


Unfortunately stable/bookworm seems to just have received mesa 22.3.6:
https://sources.debian.org/src/mesa/22.3.6-1%2Bdeb12u1/src/gallium/drivers/nouveau/nouveau_screen.c/#L244

A workaround might be to locally rebuild mesa with this patch applied.
And testing/trixie might no longer be affected with a mesa version above 22.3.7.

Kind regards,
Bernhard

I also had this error on bookworm-backports, a downgrade of libgl1-mesa-dri fixes it:

APT logs:
Commandline: apt install libgl1-mesa-dri=22.3.6-1+deb12u1 -t bookworm
Downgrade: libgl1-mesa-dri:amd64 (24.2.8-1~bpo12+1, 22.3.6-1+deb12u1)


[ 15148.494] (EE)
[ 15148.494] (EE) Backtrace:
[ 15148.495] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x139) [0x557a1e76cf79]
[ 15148.497] (EE) 1: /lib/x86_64-linux-gnu/libc.so.6 (__sigaction+0x40) [0x7f1a4a25b050]
[ 15148.498] (EE) 2: ? (?+0x0) [0x0]
[ 15148.499] (EE) 3: /lib/x86_64-linux-gnu/libgbm.so.1 (gbm_format_get_name+0xf2e) [0x7f1a49bc1eae]
[ 15148.500] (EE) 4: /lib/x86_64-linux-gnu/libgbm.so.1 (gbm_format_get_name+0x16f8) [0x7f1a49bc2678]
[ 15148.501] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 15148.501] (EE) 5: /lib/x86_64-linux-gnu/libgbm.so.1 (?+0x0) [0x7f1a49bc074c]
[ 15148.501] (EE) 6: /lib/x86_64-linux-gnu/libgbm.so.1 (gbm_create_device+0x44) [0x7f1a49bc0884]
[ 15148.502] (EE) 7: /usr/lib/xorg/modules/libglamoregl.so (glamor_egl_init+0x61) [0x7f1a49bf73c1]
[ 15148.504] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 15148.504] (EE) 8: /usr/lib/xorg/modules/drivers/modesetting_drv.so (?+0x0) [0x7f1a4ae7b733]
[ 15148.505] (EE) 9: /usr/lib/xorg/Xorg (InitOutput+0x952) [0x557a1e63c582]
[ 15148.506] (EE) 10: /usr/lib/xorg/Xorg (InitFonts+0x1ce) [0x557a1e5fd66e]
[ 15148.507] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_init_first+0x8a) [0x7f1a4a24624a]
[ 15148.508] (EE) 12: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0x85) [0x7f1a4a246305]
[ 15148.509] (EE) 13: /usr/lib/xorg/Xorg (_start+0x21) [0x557a1e5e6b71]
[ 15148.509] (EE)
[ 15148.509] (EE) Segmentation fault at address 0x0
[ 15148.509] (EE)
Fatal server error:
[ 15148.509] (EE) Caught signal 11 (Segmentation fault). Server aborting


A similar trace can be found on https://bugs.debian.org/987722

And reading my email history at the time of installing a fresh bookworm I had crashes, same traces reported in https://bugs.debian.org/1040254
I had reported it to: https://bugs.debian.org/1027867#45

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