Bug 269964

Summary: Kwin crash frecuently
Product: [Plasma] kwin Reporter: Eduardo A. Cabanillas <ea.cabanillas>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: crash Keywords: investigated, triaged
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Eduardo A. Cabanillas 2011-04-02 21:22:39 UTC 
Application: kwin (4.5.1 (KDE 4.5.1))
KDE Platform Version: 4.5.1 (KDE 4.5.1)
Qt Version: 4.7.0
Operating System: Linux 2.6.35-28-generic x86_64
Distribution: Ubuntu 10.10

-- Information about the crash:
- What I was doing when the application crashed:

kwin crash frecuently when I use Kopete, Kmail, Firefox, Ktorrent and Amarok (or Clementine) in  simultaneous.

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0x7ff4e27867a0 (LWP 9014))]

Thread 2 (Thread 0x7ff4c171c700 (LWP 9022)):
#0  0x00007ff4e20012c3 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007ff4de84776e in qt_safe_select (nfds=27, fdread=0x1968f00, fdwrite=0x1969198, fdexcept=0x1969430, orig_timeout=0x0) at kernel/qcore_unix.cpp:82
#2  0x00007ff4de84cbeb in QEventDispatcherUNIXPrivate::doSelect (this=0x1968d40, flags=<value optimized out>, timeout=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:219
#3  0x00007ff4de84d81b in QEventDispatcherUNIX::processEvents (this=0x193f140, flags=) at kernel/qeventdispatcher_unix.cpp:919
#4  0x00007ff4de81ca02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007ff4de81cdec in QEventLoop::exec (this=0x7ff4c171bcb0, flags=) at kernel/qeventloop.cpp:201
#6  0x00007ff4de7272fd in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:490
#7  0x00007ff4de7fc5f8 in QInotifyFileSystemWatcherEngine::run (this=0x1967d10) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007ff4de72a27e in QThreadPrivate::start (arg=0x1967d10) at thread/qthread_unix.cpp:266
#9  0x00007ff4dfd4f953 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007ff4de49f971 in start_thread (arg=<value optimized out>) at pthread_create.c:304
#11 0x00007ff4e200892d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ff4e27867a0 (LWP 9014)):
[KCrash Handler]
#6  KWin::Workspace::setCompositeTimer (this=0xb1a950) at ../../kwin/composite.cpp:499
#7  0x00007ff4c3f7620a in KWin::WobblyWindowsEffect::postPaintScreen (this=<value optimized out>) at ../../../kwin/effects/wobblywindows/wobblywindows.cpp:364
#8  0x00007ff4e2377c35 in KWin::EffectsHandlerImpl::postPaintScreen (this=0xe5aa50) at ../../kwin/effects.cpp:179
#9  0x00007ff4e2377c35 in KWin::EffectsHandlerImpl::postPaintScreen (this=0xe5aa50) at ../../kwin/effects.cpp:179
#10 0x00007ff4e235f253 in KWin::Scene::paintScreen (this=0xc27420, mask=0x7ff4e2377450, region=0x7ffffe93e440) at ../../kwin/scene.cpp:140
#11 0x00007ff4e2370450 in KWin::SceneOpenGL::paint (this=0xc27420, damage=<value optimized out>, toplevels=<value optimized out>) at ../../kwin/scene_opengl.cpp:754
#12 0x00007ff4e235a2a7 in KWin::Workspace::performCompositing (this=<value optimized out>) at ../../kwin/composite.cpp:454
#13 0x00007ff4e22db7dd in KWin::Workspace::qt_metacall (this=0xb1a950, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffffe93e5f0) at ./workspace.moc:583
#14 0x00007ff4de835b27 in QMetaObject::activate (sender=0xb1ae18, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x4e20) at kernel/qobject.cpp:3280
#15 0x00007ff4de82f8f9 in QObject::event (this=0xb1ae18, e=0x7ffffe93e0f0) at kernel/qobject.cpp:1183
#16 0x00007ff4dd967fdc in QApplicationPrivate::notify_helper (this=0xb4ff50, receiver=0xb1ae18, e=0x7ffffe93ed40) at kernel/qapplication.cpp:4396
#17 0x00007ff4dd96daed in QApplication::notify (this=0x7ffffe93f130, receiver=0xb1ae18, e=0x7ffffe93ed40) at kernel/qapplication.cpp:4277
#18 0x00007ff4e1b04156 in KApplication::notify (this=0x7ffffe93f130, receiver=0xb1ae18, event=0x7ffffe93ed40) at ../../kdeui/kernel/kapplication.cpp:310
#19 0x00007ff4de81dcdc in QCoreApplication::notifyInternal (this=0x7ffffe93f130, receiver=0xb1ae18, event=0x7ffffe93ed40) at kernel/qcoreapplication.cpp:732
#20 0x00007ff4de84d6f2 in sendEvent (this=0xb50960) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#21 QTimerInfoList::activateTimers (this=0xb50960) at kernel/qeventdispatcher_unix.cpp:602
#22 0x00007ff4de84d82c in QEventDispatcherUNIX::processEvents (this=0xb2be20, flags=) at kernel/qeventdispatcher_unix.cpp:923
#23 0x00007ff4dda1bc2f in QEventDispatcherX11::processEvents (this=<value optimized out>, flags=) at kernel/qeventdispatcher_x11.cpp:152
#24 0x00007ff4de81ca02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#25 0x00007ff4de81cdec in QEventLoop::exec (this=0x7ffffe93f070, flags=) at kernel/qeventloop.cpp:201
#26 0x00007ff4de820ebb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#27 0x00007ff4e22f7f9d in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../kwin/main.cpp:531
#28 0x00007ff4e1f40d8e in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7ffffe93f738) at libc-start.c:226
#29 0x0000000000400669 in _start ()

Reported using DrKonqi
Comment 1 Thomas Lübking 2011-04-02 22:06:19 UTC 
#6  KWin::Workspace::setCompositeTimer (this=0xb1a950) at
../../kwin/composite.cpp:499
#7  0x00007ff4c3f7620a in KWin::WobblyWindowsEffect::postPaintScreen
(this=<value optimized out>) at
../../../kwin/effects/wobblywindows/wobblywindows.cpp:364

unless KUbuntu has patched the wobblywindow effect, this backtrace makes no sense, since the line is "if (!compositing())" and compositing() is a oneline inliner testing whether a global pointer is NULL. That's not quite crash prone at all...

However, the wobblywindow effect as a wonky QHash implementation - probably because of the prop. "Pair" struct (effectively being QPointF)

@Eduardo:
Long story short - this backtrace makes no sense.
Do all backtraces look like this (the same first lines in thread 1, in doubt attach some) when it crashes in this context?
As a workaround you might disable the WobblyWindows effect which may be causing this - or update to a more recent KDE version.
Comment 2 Martin Flöser 2011-04-28 22:17:04 UTC 
we need some feedback. Please also test wether the crash happens at all with newer versions of KDE - at least 4.5.4.
Comment 3 Andrew Crouthamel 2018-09-22 02:06:44 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 set the bug status 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 4 Andrew Crouthamel 2018-10-27 02:38:32 UTC 
Dear Bug Submitter,

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!