https://bugs.kde.org/show_bug.cgi?id=463353

--- Comment #4 from Wyatt Childers <kdebugs.81do7@haxing.ninja> ---
I will say I did botch the expected result, though I think "kwin should
continue to respond to user input" is inferable.

My personal theory is that when flatpak updates the runtimes, if one of the
apps dependent on the runtime is running (maybe even if not?) Kwin gets into a
situation where it's blocked waiting on something from the flatpak app (perhaps
even Xwayland running in the sandbox) to respond (i.e. an operation which
normally would be almost instant, that waiting on is normally totally fine, but
during this update is blocked waiting on some part of the update).

My other theory is that perhaps the btrfs kernel IO scheduler is doing
something funny. I've had some tests that normally run at subsecond take over a
minute when lots of other tests running IO operations are occurring because the
ioscheduler was just not queuing their operations.

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