Backtrace for random segfault when toggling outputs

[vkoskiv]

Please fill out the following:

• Sway Version:

  • 1.10, Mesa 24.2.6

• Debug Log:

  • N/A, see backtrace

• Configuration File:

  • Sway config

• Stack Trace:

  • gdb bt full

• Description:
  Crash happens in drm_page_flip_pop, looks like page_flip is getting clobbered somewhere, and we end up accessing page_flip->connectors out of bounds at index 188034.
  Unable to reproduce it again, sadly, but I have the core dump.
  I was running the command below, trying to work out why only one output gets toggled. If I recall, I ran that command, only DP-1 toggled, I moved my terminal to a workspace on HDMI-A-1, erased part of the command to try toggling HDMI-A-1 too, and then Sway crashed with that backtrace above.

The command I was testing:
swaymsg output DP-1 toggle && swaymsg output HDMI-A-1 toggle

(May be unrelated, but that command only toggles one of those outputs, I have to add a sleep 1 between them for both outputs to toggle)