https://bugs.kde.org/show_bug.cgi?id=450301

--- Comment #5 from nyanpasu64 <nyanpas...@tuta.io> ---
Just woke from sleep again, and plasmashell hung shortly afterwards, with a
shadow of a notification visible (not the notification itself). I could move
the mouse and type into Discord, but not trigger Konsole or krunner to launch a
task manager and kill plasmashell.

I switched to a TTY, where htop indicated that several Electron apps and
plasmashell were burning a CPU core each, and specifically a non-main thread in
plasmashell was burning a CPU core. gdb showed that thread would not return
from syncSceneGraph.

Not sure if plasmashell and electron burning CPU were caused by resuming from
sleep, or switching to TTY. Nonetheless switching to TTY during normal
operation does not cause either Electron or plasmashell to burn a full CPU
core.

I didn't look into what Electron was doing wrong. I should've looked. However
there was no good way to check whether Electron started burning CPU before or
after switching to TTY, since I couldn't launch htop or SSH into my system
before switching to TTY.

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