Bug 398965

Summary:	Kwin won't start with 100% CPU
Product:	[Plasma] kwin	Reporter:	Niccolo Brogi <me>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	kde, me
Priority:	NOR	Keywords:	triaged
Version First Reported In:	5.12.6
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Niccolo Brogi 2018-09-22 20:46:57 UTC

SUMMARY


STEPS TO REPRODUCE
Try to launch Wwin via terminal

EXPECTED RESULT
Kwin should start

ACTUAL RESULT
Kwin doesn't start, doesn't report errors, and uses 100% CPU

SOFTWARE VERSIONS
(available in About System)
KDE Plasma Version: N/A (running on Xfce)
KDE Frameworks Version: Kwin v. 5.12.6
Qt Version: 5.9.5

ADDITIONAL INFORMATION

Following no particular event or configuration that I can remember, I am all of a sudden unable to run Kwin.

When I try to start it, it starts using 100% CPU and hangs with me having no window manager. In addition, I'm unable to kill the process with "killall kwin", and I actually have to look up the pid and do "kill -9".

I tried purging and re-installing, to no avail, even after removing ~/.kde/.

What could be the cause, or a way to figure out what it's doing..? The terminal doesn't print ANYTHING, it just hangs.

The same thing happens if I create a brand-new user and try to start Kwin from a brand-new session.

Comment 1 David Edmundson 2018-09-27 17:47:25 UTC

when it is hanging please switch to a tty and run

sudo gdb --pid `pidof kwin_x11`

then when it's connected type "bt" to get a backtrace and put it here.

Comment 2 Andrew Crouthamel 2018-10-21 05:04:39 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 3 Bug Janitor Service 2018-11-12 16:05:37 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!