https://bugs.kde.org/show_bug.cgi?id=499405
Bug ID: 499405
Summary: kwin_x11 100% cpu and display locked
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: p...@pfortin.com
Target Milestone: ---
SUMMARY
Twice in the past 4 hours, KDE desktop completely locked up (even the clock
seconds were not updating). The mouse cursor was a hand as the trigger was
grabbing the title bar of an emacs window and dragging between 2 physical
screens.
kwin_x11 was 100%. 2xCtrl+Alt+Bksp eventually gives a login; but I only get 1
of 10 virtual desktops. The Windows key wants to display the application menu;
but only about 1/8" of the menu bottom appears. Very little looks right. A full
reboot is required to clear the mess up.
I know this is not yet enough info; but opening this issue to track any new
lockups and maybe provide a hint to anyone else seeing this.
STEPS TO REPRODUCE
1. Open file with emacs: "e file &" using: alias e='function _(){ emacs "$*"
; }; _'
2. grab emacs window title bar and drag with to another physical screen (I have
3 monitors)
3. seems to be a race condition at play since this is not easily repeatable.
It may be that a konsole has a long running process with occasional output[1]
as I drag the emacs window over it. Across physical displays was the case in
both lockups; but it may just be dragging emacs over the konsole. Will add
more each time this happens.
[1] In both cases the long running process was a python script copying millions
of rows into a PostgreSQL database; the COPY continued to completion, including
table indexing. I monitored this via tty3, htop and ps...
OBSERVED RESULT
Total GUI lockup. Reboot required.
EXPECTED RESULT
No lockup
SOFTWARE/OS VERSIONS
Operating System: Mageia 10
KDE Plasma Version: 6.2.91
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.6.74-server-1.mga10 (64-bit)
Graphics Platform: X11
Processors: 20 × 12th Gen Intel® Core™ i7-12700K
Memory: 125.5 GiB of RAM
Graphics Processor: AMD Radeon RX 6600 XT
Manufacturer: Dell Inc.
Product Name: XPS 8950
ADDITIONAL INFORMATION
Dunno if related; but htop showed an xdg-open process in Z state along with
kwin_x11 at 100% cpu.
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