Fast HDMI disconnect/connect crashes various programs

[falkkyburz]

Hyprland version

I'm on -git:
aquamarine-git 0.11.0.r8.g27b35e7-1
hyprland-git 0.55.0.r12.g5e441ca-1
hyprtoolkit-git 0.5.4.r18.gd6b8a63-1
hyprgraphics-git 0.5.1.r3.g68d0644-1
hyprwire-git 0.3.1.r2.g85148a8-1
hyprpaper-git 0.8.4.r0.g20fc0fa-1
hyprsunset-git 0.3.3.r10.geae0132-1
hyprlauncher-git 0.1.6.r0.gc682906-1
hyprpolkitagent-git 0.1.3.r4.g713b7ea-1
hyprland-qt-support-git 0.1.0.r10.g9ef7f69-1
xdg-desktop-portal-hyprland-git 1.3.12.r3.g813ea5c-1
wayland 1.25.0-1
wayland-protocols 1.48-1

Regression

Unknown

Describe the bug

The hypr* ecosystem crashes when the HDMI is quickly disconnected/connected from the monitor when changing monitor input (from the monitor OSD)
Edit: Not only the hypr ecosystem crashed, many other applications crash.

Reproduction steps

In the initial state monitor input is set to Display Port and is showing a different PC. A HDMI cable is plugged in on the second input of the monitor.

Then I plug in the HDMI cable on the Hyprland machine, it detects the monitor and switches to the multi monitor setup. the monitor still displays the Display port input. After some seconds I go and switch the monitor input to HDMI. The switch works, but some of the the hypr* ecosystem crashes, including hyprpapr (all wallpapers gone). Hyprland is still working fine.

System info and config

ThinkPad T14s Gen 2i
Linux 7.0.5-arch1-1
Hyprland 0.55.0-12-g5e441cae5
Intel Iris Xe Graphics
ASUSTek COMPUTER INC VG27WQ L7LMDW002597

systeminfo.txt

Logs

With the help of AI:

HDMI Events

• 20:44:20.313426044+0200: HDMI-A-1 connected. I plugged in the HDMI cable.
• 20:44:30.634121753+0200: HDMI-A-1 disconnected. I switched the input from Display Port to HDMI on the monitor.
• 20:44:31.765402274+0200: HDMI-A-1 connected.

Events came from udevadm monitor --kernel --property --subsystem-match=drm and were logged only on HOTPLUG=1.

New Coredumps

• PID 1828791, /usr/bin/hyprpaper, SIGABRT, timestamp 20:44:33, core present.
• PID 1828794, /usr/bin/hyprsunset, SIGABRT, timestamp 20:44:33, core present.
• PID 1828796, /usr/bin/hyprlauncher, SIGABRT, timestamp 20:44:33, core present.

Journal Notes

• 20:44:32: hyprpolkitagent logged wl_display#1: error 0: invalid object 37 and The Wayland connection experienced a fatal error: Invalid argument.
• 20:44:32: hyprpolkitagent.service exited with status=255/EXCEPTION.
• 20:44:32: coredump processing started for hyprlauncher, hyprpaper, and hyprsunset.
• 20:44:33: all three coredumps were written.
• 20:44:33: hyprpolkitagent.service restarted successfully.

Stack Notes

• hyprpaper abort path includes Hyprtoolkit::CBackend::enterLoop and CUI::run.
• hyprlauncher abort path includes Hyprtoolkit::CBackend::enterLoop and main.
• hyprsunset abort path includes CHyprsunset::startEventLoop.

Fix

AI found that the issue is the fast reconnection of the HDMI connection with the same name (use after free, dangling pointer). I can confirm this patch fixes the issue: https://github.com/falkkyburz/Hyprland/commit/c478e569b3ef667a0737321c73aa53ee27b5e3d2

Possibly Related

#14352
hyprwm/aquamarine#240

[alba4k]

Might have something similar, also on intel. In my case the following apps sometimes crash:

• vesktop
• hyprpaper
• waybar
• vscode
  and these always crash:
• firefox
• hyprsunset

If that's the case for you too, I'd recommend changing the title to something like "Fast Output (dis)connects crash various programs"

[MightyCoderX]

For me it always appear to make the following apps crash:

• hyprpaper
• hyprlock (when i resume my laptop from sleep it's just frozen and unresponsive)
• wezterm
• alacritty
• ghostty

the only thing that doesn't crash is zen browser.
they all crash after both screens flash black and then become visible, before the external one comes back (or a few ms later)

[falkkyburz]

Adjacent issues:
#14817
#14769
#12791

[alba4k]

This should now be really easy to replicate on -git, you can now simply have a monitor rule that turns eDP-1 (or your single monitor) back on with hl.on("monitor.removed", ...) and just hyprctl eval "hl.monitor({output = "eDP-1", disabled = true})"

[falkkyburz]

Hmm I'm not following. This issue is triggered from the monitor side behavior and HDMI plug cycles, not enable/disable monitors in Hyprland. Am I missing something?

[alba4k]

it's triggered by fast monitor layout changes, on my setup at least

and in this scenario what happens is

• eDP 1 disappears
• FALLBACK appears
• eDP 1 appears
• FALLBACK disappears

in a very quick succession

[MightyCoderX]

but what does that fix? my monitors both turn on after flashing but the problem is not that, the problem is that apps crash in the meanwhile it's not clear what you mean with this comment, it sounds like a completely different problem

[alba4k]

apps crash for me in this scenario.

[falkkyburz]

This is fixed by 50d301d, please confirm.

[alba4k]

yup can confirm