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Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently

Cross-posted to 2 groups.

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Package: src:linux
Version: 6.12.57-1
Followup-For: Bug #1054514

Dear Maintainer,

This is back in trixie --- unsurprisingly, because the kernel commit which
had originally caused this bug, and was subsequently reverted, was reapplied
to the kernel in 6.8.10:

   https://www.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.8.10
   (Reapply "drm/qxl: simplify qxl_fence_wait")

In addition to making the remote graphics freeze (which is annoying but
tolerable), the graphics driver hang also appears to cause systemd tasks
to hang... which leads to problems with remote login via ssh, and also
the inability to do a clean reboot/shutdown (which is intolerable).

Sample of the kernel log for hung systemd task (bookended by the telltale
"Buffer eviction failed" every 15 seconds):

[413120.319715] INFO: task systemd:1 blocked for more than 1208 seconds.
[413120.319718]       Not tainted 6.12.57+deb13-amd64 #1 Debian 6.12.57-1
[413120.319719] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[413120.319720] task:systemd         state:D stack:0     pid:1     tgid:1     ppid:0      flags:0x00000002
[413120.319723] Call Trace:
[413120.319724]  <TASK>
[413120.319726]  __schedule+0x505/0xc00
[413120.319730]  schedule+0x27/0xf0
[413120.319732]  schedule_preempt_disabled+0x15/0x30
[413120.319733]  __ww_mutex_lock.constprop.0+0x4f6/0x9a0
[413120.319736]  drm_modeset_lock+0x42/0xe0 [drm]
[413120.319765]  drm_atomic_get_plane_state+0x7f/0x180 [drm]
[413120.319777]  drm_client_modeset_commit_atomic+0xbf/0x250 [drm]
[413120.319793]  ? do_sys_poll+0x4e1/0x600
[413120.319796]  drm_client_modeset_commit_locked+0x5a/0x160 [drm]
[413120.319810]  drm_fb_helper_pan_display+0xf2/0x240 [drm_kms_helper]
[413120.319819]  fb_pan_display+0x89/0x140
[413120.319821]  bit_update_start+0x1e/0x40
[413120.319822]  fbcon_switch+0x421/0x5b0
[413120.319825]  csi_J+0x286/0x2d0
[413120.319826]  do_con_write+0x1368/0x2440
[413120.319828]  ? tomoyo_path_number_perm+0x8c/0x1f0
[413120.319830]  ? _prb_read_valid+0x298/0x310
[413120.319832]  con_write+0x13/0x50
[413120.319833]  n_tty_write+0x15a/0x500
[413120.319835]  ? __pfx_woken_wake_function+0x10/0x10
[413120.319837]  file_tty_write.isra.0+0x172/0x2c0
[413120.319840]  vfs_write+0x28c/0x440
[413120.319842]  ksys_write+0x6d/0xf0
[413120.319844]  do_syscall_64+0x82/0x190
[413120.319845]  ? tty_ioctl+0x145/0x8a0
[413120.319847]  ? arch_exit_to_user_mode_prepare.isra.0+0x16/0xa0
[413120.319850]  ? syscall_exit_to_user_mode+0x37/0x1b0
[413120.319851]  ? do_syscall_64+0x8e/0x190
[413120.319852]  ? do_sys_openat2+0x9c/0xe0
[413120.319853]  ? do_syscall_64+0x8e/0x190
[413120.319854]  ? arch_exit_to_user_mode_prepare.isra.0+0x16/0xa0
[413120.319856]  ? syscall_exit_to_user_mode+0x37/0x1b0
[413120.319857]  ? do_syscall_64+0x8e/0x190
[413120.319858]  ? __x64_sys_ppoll+0xf4/0x160
[413120.319859]  ? arch_exit_to_user_mode_prepare.isra.0+0x16/0xa0
[413120.319861]  ? syscall_exit_to_user_mode+0x37/0x1b0
[413120.319862]  ? do_syscall_64+0x8e/0x190
[413120.319862]  ? clear_bhb_loop+0x40/0x90
[413120.319864]  ? clear_bhb_loop+0x40/0x90
[413120.319865]  ? clear_bhb_loop+0x40/0x90
[413120.319866]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[413120.319869] RIP: 0033:0x7f38ba499687
[413120.319878] RSP: 002b:00007ffd7e321560 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[413120.319879] RAX: ffffffffffffffda RBX: 00007f38baa3ee00 RCX: 00007f38ba499687
[413120.319880] RDX: 000000000000000c RSI: 00007f38ba927cc4 RDI: 0000000000000025
[413120.319881] RBP: 0000000000000025 R08: 0000000000000000 R09: 0000000000000000
[413120.319881] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000186a0
[413120.319882] R13: 0000005fe7e4b3fb R14: 000000000000000c R15: 0000000000000025
[413120.319883]  </TASK>
[413120.319884] Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings
[413123.903768] [TTM] Buffer eviction failed
[413139.007582] [TTM] Buffer eviction failed
[413154.111473] [TTM] Buffer eviction failed
[413169.215198] [TTM] Buffer eviction failed
[413184.319084] [TTM] Buffer eviction failed
[413199.422894] [TTM] Buffer eviction failed
[413214.526697] [TTM] Buffer eviction failed

-mm


-- Package-specific info:
** Version:
Linux version 6.12.57+deb13-amd64 (debian-kernel@lists.debian.org) (x86_64-linux-gnu-gcc-14 (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44) #1 SMP PREEMPT_DYNAMIC Debian 6.12.57-1 (2025-11-05)

** Command line:
BOOT_IMAGE=/boot/vmlinuz-6.12.57+deb13-amd64 root=UUID=7f033b69-2e47-40d0-805b-6c68c0c59cf5 ro

-- System Information:
Debian Release: 13.2
   APT prefers stable-updates
   APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.57+deb13-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently Timo Lindfors <timo.lindfors@iki.fi> - 2023-10-24 22:20 +0200
  Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently Salvatore Bonaccorso <carnil@debian.org> - 2023-10-24 23:20 +0200
    Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently Timo Lindfors <timo.lindfors@iki.fi> - 2023-10-24 23:50 +0200
      Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently "Linux regression tracking (Thorsten Leemhuis)"  <regressions@leemhuis.info> - 2023-12-06 11:50 +0100
        Bug#1054514: [PATCH 0/1] drm/qxl: fixes qxl_fence_wait Alex Constantino <dreaming.about.electric.sheep@gmail.com> - 2024-03-08 02:20 +0100
          Bug#1054514: [PATCH 1/1] drm/qxl: fixes qxl_fence_wait Alex Constantino <dreaming.about.electric.sheep@gmail.com> - 2024-03-08 02:20 +0100
            Bug#1054514: [PATCH 1/1] drm/qxl: fixes qxl_fence_wait Thorsten Leemhuis <regressions@leemhuis.info> - 2024-03-08 10:50 +0100
            Bug#1054514: [PATCH 1/1] drm/qxl: fixes qxl_fence_wait "Linux regression tracking (Thorsten Leemhuis)"  <regressions@leemhuis.info> - 2024-03-20 16:30 +0100
              Bug#1054514: [PATCH 1/1] drm/qxl: fixes qxl_fence_wait Maxime Ripard <mripard@kernel.org> - 2024-03-27 14:40 +0100
                Bug#1054514: [PATCH v2 0/1] Revert "drm/qxl: simplify qxl_fence_wait" Alex Constantino <dreaming.about.electric.sheep@gmail.com> - 2024-04-06 09:50 +0200
    Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently Bagas Sanjaya <bagasdotme@gmail.com> - 2023-10-25 02:10 +0200
  Bug#1054514: [PATCH v2 1/1] Revert "drm/qxl: simplify qxl_fence_wait" Alex Constantino <dreaming.about.electric.sheep@gmail.com> - 2024-04-06 09:50 +0200
    Bug#1054514: [PATCH v2 1/1] Revert "drm/qxl: simplify qxl_fence_wait" Greg KH <gregkh@linuxfoundation.org> - 2024-04-06 09:51 +0200
    Bug#1054514: (subset) [PATCH v2 1/1] Revert "drm/qxl: simplify qxl_fence_wait" Maxime Ripard <mripard@kernel.org> - 2024-04-06 09:51 +0200
  Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently Matt Marjanovic <maddog@mir.com> - 2025-12-09 20:30 +0100
    Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently Salvatore Bonaccorso <carnil@debian.org> - 2025-12-09 23:10 +0100
  Processed: Re: Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM  with qxl graphics freezes frequently "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-12-09 23:10 +0100
  Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently Avraham Hollander <anhollander516@gmail.com> - 2025-12-10 03:10 +0100

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