Bug 343260 - total desktop freeze on alt+tab
Summary: total desktop freeze on alt+tab
Status: RESOLVED DUPLICATE of bug 340294
Alias: None
Product: kwin
Classification: Plasma
Component: general (show other bugs)
Version: 5.1.95
Platform: Ubuntu Linux
: NOR grave
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-01-25 02:05 UTC by Nick Shaforostoff
Modified: 2015-01-25 02:46 UTC (History)
0 users

See Also:
Latest Commit:
Version Fixed In:

Attachments
kwin backtraces (3.10 KB, application/x-bzip)
2015-01-25 02:06 UTC, Nick Shaforostoff 		Details
kded backtraces (2.41 KB, application/x-bzip)
2015-01-25 02:07 UTC, Nick Shaforostoff 		Details
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Description Nick Shaforostoff 2015-01-25 02:05:03 UTC 
i have ubuntu vivid updated to latest packages with dist-upgrade on my netbook with atom n2600 (powervr gpu). i have a simple alt-tab switcher that displays windows as large icons on the bar appearing on the left side. 


Reproducible: Always

Steps to Reproduce:
sometimes (usually 10 times trying is enough) when i press alt+tab the desktop freezes totally. only mouse pointer can be moved.




i switched to console with ctrl+alt+f2 and saw that kded5 and kwin are eating 100% of cpu. i attached gdb to them and issued 'bt' command, then 'c' and waited few seconds then 'bt' again and so on. you can find output in files attached.

i had this freeze in vivd alpha1 as well, so it is not very new issue.
Comment 1 Nick Shaforostoff 2015-01-25 02:06:15 UTC 
Created attachment 90634 [details]
kwin backtraces
Comment 2 Nick Shaforostoff 2015-01-25 02:07:29 UTC 
Created attachment 90635 [details]
kded backtraces

at first the alt+tab freezes only for a second. but if i continue using it, it will freeze totally, and i will have to reboot ;(
Comment 3 Thomas Lübking 2015-01-25 02:09:40 UTC 
likely bug #340294 -is that with the default breeze switcher (the vertical bar on the left side)?
Comment 4 Nick Shaforostoff 2015-01-25 02:46:46 UTC 
yes

*** This bug has been marked as a duplicate of bug 340294 ***