Created attachment 139684 [details]
Xwayland crashed when I tried return to desktop while playing game MAD MAX (pressed Alt + Tab)
This happens one times, and I unable it reproduce again.
Crash is in Xwayland present code.
It maybe only happened once because it seems to happen when a sync-event is still pending from the Wayland server, what is a very small part of a full refresh cycle.
It's weird that the crash happened after the sync event triggered present_wnmd_event_notify very late in present_send_complete_notify's call to present_window_priv. I would have assumed such a crash could only happen earlier. Does this mean the private window struct is suddenly gone?
Created attachment 140141 [details]
It seems exactly this crash just happened to me as well when trying to launch Steam.
The "Updating Steam Information.." dialog appeared and afterwards my session froze.
Should be fixed with ce271535adb697.