Hello.
After upgrading xserver-xorg-core and xserver-common from 2:21.1.24-1 to
2:21.1.25-1 X server crashes immediately after start.

systemd-coredump[684]: Process 622 (Xorg) of user 0 dumped core.

Module libstdc++.so.6 from deb gcc-16-16.2.0-3.amd64
Module libzstd.so.1 from deb libzstd-1.5.7+dfsg-1.amd64
Module libgcc_s.so.1 from deb gcc-16-16.2.0-3.amd64
Module libsystemd.so.0 from deb systemd-257.13-1~deb13u1.amd64
Module libudev.so.1 from deb systemd-257.13-1~deb13u1.amd64
Stack trace of thread 622:
#0  0x00007faf62a27d0c __pthread_kill_implementation (libc.so.6 + 0x96d0c)
#1  0x00007faf629d1582 __GI_raise (libc.so.6 + 0x40582)
#2  0x00007faf629b9507 __GI_abort (libc.so.6 + 0x28507)
#3  0x0000560917282990 OsAbort (/usr/lib/xorg/Xorg + 0x205990)
#4  0x0000560917288fd9 n/a (/usr/lib/xorg/Xorg + 0x20bfd9)
#5  0x000056091728a1a5 FatalError (/usr/lib/xorg/Xorg + 0x20d1a5)
#6  0x000056091727fb13 n/a (/usr/lib/xorg/Xorg + 0x202b13)
#7  0x00007faf629d16b0 __restore_rt (libc.so.6 + 0x406b0)
#8  0x00007faf62141d4f n/a (radeon_drv.so + 0x4ed4f)
#9  0x00005609171dcfec n/a (/usr/lib/xorg/Xorg + 0x15ffec)
#10 0x00005609171e0cdd n/a (/usr/lib/xorg/Xorg + 0x163cdd)
#11 0x00005609170df9e7 n/a (/usr/lib/xorg/Xorg + 0x629e7)
#12 0x00005609170e4c88 n/a (/usr/lib/xorg/Xorg + 0x67c88)
#13 0x00005609170e9466 n/a (/usr/lib/xorg/Xorg + 0x6c466)
#14 0x00007faf629bafba __libc_start_call_main (libc.so.6 + 0x29fba)
#15 0x00007faf629bb0d7 __libc_start_main_impl (libc.so.6 + 0x2a0d7)
#16 0x00005609170cf281 _start (/usr/lib/xorg/Xorg + 0x52281)

Stack trace of thread 631:
#0  0x00007faf62a2defe __syscall_cancel_arch (libc.so.6 + 0x9cefe)
#1  0x00007faf62a229d4 __internal_syscall_cancel (libc.so.6 + 0x919d4)
#2  0x00007faf62a22c8c __futex_abstimed_wait_common64 (libc.so.6 + 0x91c8c)
#3  0x00007faf62a25328 __pthread_cond_wait_common (libc.so.6 + 0x94328)
#4  0x00007faf5f577ced n/a (libgallium-26.2.4-1.so + 0x739ced)
#5  0x00007faf5f52bdbc n/a (libgallium-26.2.4-1.so + 0x6eddbc)
#6  0x00007faf5f577c2b n/a (libgallium-26.2.4-1.so + 0x739c2b)
#7  0x00007faf62a25db8 start_thread (libc.so.6 + 0x94db8)
#8  0x00007faf62aa3f58 __clone3 (libc.so.6 + 0x112f58)

Stack trace of thread 635:
#0  0x00007faf62a2defe __syscall_cancel_arch (libc.so.6 + 0x9cefe)
#1  0x00007faf62a229d4 __internal_syscall_cancel (libc.so.6 + 0x919d4)
#2  0x00007faf62a22a1d __syscall_cancel (libc.so.6 + 0x91a1d)
#3  0x00007faf62aa420d epoll_wait (libc.so.6 + 0x11320d)
#4  0x0000560917280578 n/a (/usr/lib/xorg/Xorg + 0x203578)
#5  0x000056091727d719 n/a (/usr/lib/xorg/Xorg + 0x200719)
#6  0x00007faf62a25db8 start_thread (libc.so.6 + 0x94db8)
#7  0x00007faf62aa3f58 __clone3 (libc.so.6 + 0x112f58)

Stack trace of thread 632:
#0  0x00007faf62a2defe __syscall_cancel_arch (libc.so.6 + 0x9cefe)
#1  0x00007faf62a229d4 __internal_syscall_cancel (libc.so.6 + 0x919d4)
#2  0x00007faf62a22c8c __futex_abstimed_wait_common64 (libc.so.6 + 0x91c8c)
#3  0x00007faf62a25328 __pthread_cond_wait_common (libc.so.6 + 0x94328)
#4  0x00007faf5f577ced n/a (libgallium-26.2.4-1.so + 0x739ced)
#5  0x00007faf5f52bdbc n/a (libgallium-26.2.4-1.so + 0x6eddbc)
#6  0x00007faf5f577c2b n/a (libgallium-26.2.4-1.so + 0x739c2b)
#7  0x00007faf62a25db8 start_thread (libc.so.6 + 0x94db8)
#8  0x00007faf62aa3f58 __clone3 (libc.so.6 + 0x112f58)
ELF object binary architecture: AMD x86-64

Dear Maintainer,


*** End of the template - remove these template lines ***
I am experiencing the X server crash on my system, which runs on an Intel Raptor Lake-P (UHD Graphics) controller. The graphical session crashes unexpectedly during usage, terminating the Xorg server process and forcing the session to close. This issue seems to be directly related to the recent updates in the xserver-xorg-core package (version 2:21.1.25-1).

I am tracking this issue and providing my system logs below to help diagnose the crash.

It also crashes for me. Radeon RX 7800 XT, sddm, kernel both 7.2.6 and
7.2.10, firmware-amd-graphics both 20260810-1 and 20260916-1, everything
else from current sid. Rolling back xserver-xorg-core and xserver-common
to 2:21.1.24-1 fixes it.

One crash, with my usual weird xrandr --scale setup:

(II) AMDGPU(0): Allocate new frame buffer 7680x2160
(II) AMDGPU(0):  => pitch 30720 bytes
(EE) Backtrace:
(EE) 0: /usr/lib/xorg/Xorg (?+0x0) [0x559f62adaaaf]
(EE) 1: /usr/lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7efbffb246b0]
(EE) 2: /usr/lib/xorg/modules/drivers/amdgpu_drv.so (?+0x0) [0x7efbff463a3b]
(EE) 3: /usr/lib/xorg/Xorg (?+0x0) [0x559f62a37fec]
(EE) 4: /usr/lib/xorg/Xorg (?+0x0) [0x559f62a39f7b]
(EE) 5: /usr/lib/xorg/Xorg (miPaintWindow+0x274) [0x559f62ab7dd4]
(EE) 6: /usr/lib/xorg/Xorg (miWindowExposures+0x10d) [0x559f62ab7a6d]
(EE) 7: /usr/lib/xorg/Xorg (?+0x0) [0x559f6299a9a3]
(EE) 8: /usr/lib/xorg/Xorg (miHandleValidateExposures+0x72) [0x559f62acd9c2]
(EE) 9: /usr/lib/xorg/Xorg (SetRootClip+0x1f0) [0x559f62975fd0]
(EE) 10: /usr/lib/xorg/Xorg (?+0x0) [0x559f629cbb72]
(EE) 11: /usr/lib/xorg/Xorg (?+0x0) [0x559f629c78a4]
(EE) 12: /usr/lib/xorg/Xorg (ProcRRSetScreenSize+0x1ba) [0x559f62a1f3ea]
(EE) 13: /usr/lib/xorg/Xorg (?+0x0) [0x559f6293fc88]
(EE) 14: /usr/lib/xorg/Xorg (?+0x0) [0x559f62944466]
(EE) 15: /usr/lib/x86_64-linux-gnu/libc.so.6 (__libc_start_call_main+0x7a) [0x7efbffb0dfba]
(EE) 16: /usr/lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main_alias_2+0x87) [0x7efbffb0e0d7]
(EE) 17: /usr/lib/xorg/Xorg (_start+0x21) [0x559f6292a281]
(EE) Segmentation fault at address 0x0

Another, with just one screen connected and no xrandr:

(EE) 0: /usr/lib/xorg/Xorg (?+0x0) [0x560d10db0aaf]
(EE) 1: /usr/lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7f2c1fa1d6b0]
(EE) 2: /usr/lib/xorg/modules/drivers/amdgpu_drv.so (?+0x0) [0x7f2c1f35ca55]
(EE) 3: /usr/lib/xorg/Xorg (?+0x0) [0x560d10d0dfec]
(EE) 4: /usr/lib/xorg/Xorg (DamageDamageRegion+0x19) [0x560d10d12619]
(EE) 5: /usr/lib/xorg/Xorg (?+0x0) [0x560d10d0b9d5]
(EE) 6: /usr/lib/xorg/Xorg (?+0x0) [0x560d10d0a56d]
(EE) 7: /usr/lib/xorg/Xorg (?+0x0) [0x560d10c15c88]
(EE) 8: /usr/lib/xorg/Xorg (?+0x0) [0x560d10c1a466]
(EE) 9: /usr/lib/x86_64-linux-gnu/libc.so.6 (__libc_start_call_main+0x7a) [0x7f2c1fa06fba]
(EE) 10: /usr/lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main_alias_2+0x87) [0x7f2c1fa070d7]
(EE) 11: /usr/lib/xorg/Xorg (_start+0x21) [0x560d10c00281]
(EE) Segmentation fault at address 0x0

(sorry, not going to install debug symbols and do all of this again)

Andrey Rakhmatullin kirjoitti 13.10.2026 klo 16.07:

would you be able to bisect it? There are only 44 commits in this
release, mostly CVE-fixes..

I can try this but only on the weekend.

We believe that the bug you reported is fixed in the latest version of
xorg-server, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1150321@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Timo Aaltonen <tjaalton@debian.org> (supplier of updated xorg-server package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Wed, 14 Oct 2026 17:37:18 +0300
Source: xorg-server
Built-For-Profiles: derivative.ubuntu noudeb
Architecture: source
Version: 2:21.1.25-2
Distribution: unstable
Urgency: medium
Maintainer: Debian X Strike Force <debian-x@lists.debian.org>
Changed-By: Timo Aaltonen <tjaalton@debian.org>
Closes: 1150321
Changes:
 xorg-server (2:21.1.25-2) unstable; urgency=medium
 .
   * patches: Revert a commit which broke driver abi. (Closes: #1150321)
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