118758 2005-12-21 01:19:14 +0000 Kwin crashes when ALT+TAB and "Show window list while switching windows" is enabled 2006-01-04 22:34:39 +0000 1 1 4 Plasma kwin general unspecified Gentoo Packages Linux RESOLVED DUPLICATE 112737 NOR normal --- 0 stolz kwin-bugs-null 0 oldest_to_newest 400451 0 stolz 2005-12-21 01:19:14 +0000 Version: (using KDE KDE 3.5.0) Installed from: Gentoo Packages Compiler: gcc version 3.4.4 Flags used for compile: -march=k8 -O2 -pipe OS: Linux This is an easy reproductible bug. Steps to reproduce the bug: --------------------------- 1.- Go to "Control Center-> Desktop-> Window Behaviour->" and enable "Show window list while switching windows" 2.- Be sure there is no window opened, just kicker and a clean desktop. 3.- Hit "ALT+TAB" or whatever other key combination you have assigned to "switching window" 4.- You will see how Kwin crashes and eats 100% of CPU, making the system unusable. If you disable de "Show window list while switching windows" option under the Control Center, the bug disappears. 400942 1 phil 2005-12-22 22:31:04 +0000 Do you have a backtrace? If so, please paste it. Though, I'm slightly confused: you say kwin crashes *and* eats CPU, but if it's crashed, then it can't use CPU, since the process has been killed. Do you get a crash dialog? 400988 2 stolz 2005-12-23 01:21:36 +0000 Thanks for your answer. I don't have a backtrace, but if it can help to solve the problem and someone explains me how to get one, it would be appreciated :) Well, when any program stops working and consumes 100% of CPU I always say "it is crashed". May be it's not the correct way of naming it so I will explain it with more detail to avoid confusion: -When I press "ALT+TAB" my keyboard stops working. I can move the mouse and see the cursor moving around the screen, but it has no effects no matther where I click. I don't get a crash dialog. -If I connect to my machine via SSH (it takes a lot of time but finally I can login). The system works slowly and when run 'top' I can see the Kwin process using 100% CPU. -If I run 'killall -9 kwin' my keyboard and mouse in the KDE enviourment start working again and all KDE programs seem to work again too (except the fact that there is no windows decorations because I've killed Kwin ;-) ). If there is anything else I can do to help the problem to be solved just tell me. Regards. 401108 3 phil 2005-12-23 17:25:52 +0000 To get a backtrace, you can use "kill -SEGV <pid-of-kwin>", I think - that should cause a KDE crash handler to appear, with a backtrace tab. 401236 4 stolz 2005-12-24 05:11:07 +0000 I've tried it, but nothing happens (just what I commented in my last post, my keyboard and mouse in the KDE enviourment start working again). I don't see any output after running "kill -SEGV `pidof kwin`" and I don't see any window on the KDE sceen. I've installed kdebugdialog but it is not showed either. Whay package/program should I install to get the "KDE crash handler"? 402097 5 stolz 2005-12-28 23:30:33 +0000 Could you reproduce the bug? I see it remais as UNCONFIRMED :/ I've tried it at my brother's computer (Suse) and seems the bug is there too. 402514 6 phil 2005-12-30 12:19:38 +0000 I still can't reproduce this behaviour - you might want to try to find other users (in some KDE forum or IRC channel) who can reproduce the bug, to get more data points. They can then add a comment to this bug. 402731 7 sigstorm 2005-12-31 10:35:24 +0000 I reproduced the bug two times . The keyboard and the mouse hangs. I have to do a hard reset to my computer. Note : The opcion "Show window list while switching windows" I have it disabled. 402734 8 stolz 2005-12-31 11:08:29 +0000 Philip, I'm afraid I made a mistake when I reported the bug. To reproduce it, the option "Show window list while switching windows" must be disabled, sorry. 403654 9 l.lunak 2006-01-04 22:34:39 +0000 *** This bug has been marked as a duplicate of 112737 ***