Application: kwin (4.4.92 (KDE 4.4.92 (KDE 4.5 RC2))) KDE Platform Version: 4.4.92 (KDE 4.4.92 (KDE 4.5 RC2)) Qt Version: 4.7.0 Operating System: Linux 2.6.35-9-generic i686 Distribution: Ubuntu maverick (development branch) -- Information about the crash: - What I was doing when the application crashed: I checked "use VSync" setting in the Advanced tab, and Kwin crashed. -- Backtrace: Application: KWin (kwin), signal: Segmentation fault [Current thread is 1 (Thread 0xb77d2720 (LWP 1462))] Thread 2 (Thread 0xae681b70 (LWP 1482)): #0 0x00bc7e46 in clock_gettime () from /lib/librt.so.1 #1 0x0474d7eb in do_gettime () at tools/qelapsedtimer_unix.cpp:105 #2 qt_gettime () at tools/qelapsedtimer_unix.cpp:119 #3 0x04823ac5 in QTimerInfoList::updateCurrentTime (this=0x8899028) at kernel/qeventdispatcher_unix.cpp:339 #4 0x04824135 in QEventDispatcherUNIXPrivate::doSelect (this=0x8898988, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:182 #5 0x04825005 in QEventDispatcherUNIX::processEvents (this=0x884d7c8, flags=...) at kernel/qeventdispatcher_unix.cpp:919 #6 0x047f1cb9 in QEventLoop::processEvents (this=0xae681280, flags=) at kernel/qeventloop.cpp:149 #7 0x047f213a in QEventLoop::exec (this=0xae681280, flags=...) at kernel/qeventloop.cpp:201 #8 0x046efa8e in QThread::exec (this=0x885e078) at thread/qthread.cpp:490 #9 0x047d0eab in QInotifyFileSystemWatcherEngine::run (this=0x885e078) at io/qfilesystemwatcher_inotify.cpp:248 #10 0x046f2d09 in QThreadPrivate::start (arg=0x885e078) at thread/qthread_unix.cpp:266 #11 0x0085fcc9 in start_thread () from /lib/libpthread.so.0 #12 0x001e073e in clone () from /lib/libc.so.6 Thread 1 (Thread 0xb77d2720 (LWP 1462)): [KCrash Handler] #7 0x00811faa in dri2DrawableGetMSC (psc=0x81f0b00, pdraw=0x0, ust=0xbfcfbc78, msc=0xbfcfbc70, sbc=0xbfcfbc68) at dri2_glx.c:212 #8 0x007ebcbc in __glXGetVideoSyncSGI (count=0xbfcfbcbc) at glxcmds.c:2182 #9 0x00b2d973 in KWin::SceneOpenGL::waitSync (this=0x8251c00) at ../../kwin/scene_opengl.cpp:781 #10 0x00b32387 in KWin::SceneOpenGL::flushBuffer (this=0x8251c00, mask=0, damage=...) at ../../kwin/scene_opengl.cpp:830 #11 0x00b33434 in KWin::SceneOpenGL::paint (this=0x8251c00, damage=..., toplevels=...) at ../../kwin/scene_opengl.cpp:761 #12 0x00b1b174 in KWin::Workspace::performCompositing (this=0x8264da0) at ../../kwin/composite.cpp:455 #13 0x00a8c2be in KWin::Workspace::qt_metacall (this=0x8264da0, _c=QMetaObject::InvokeMetaMethod, _id=190, _a=0xbfcfbfdc) at ./workspace.moc:583 #14 0x047f8f3a in QMetaObject::metacall (object=0x8264da0, cl=8462208, idx=190, argv=0xbfcfbfdc) at kernel/qmetaobject.cpp:237 #15 0x0480bccd in QMetaObject::activate (sender=0x8265050, m=0x49245a4, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3280 #16 0x0485d1c7 in QTimer::timeout (this=0x8265050) at .moc/release-shared/moc_qtimer.cpp:134 #17 0x048117de in QTimer::timerEvent (this=0x8265050, e=0xbfcfc530) at kernel/qtimer.cpp:271 #18 0x04805b54 in QObject::event (this=0x8265050, e=0x81f0b00) at kernel/qobject.cpp:1183 #19 0x0513208c in QApplicationPrivate::notify_helper (this=0x8184550, receiver=0x8265050, e=0xbfcfc530) at kernel/qapplication.cpp:4389 #20 0x051380ce in QApplication::notify (this=0xbfcfc834, receiver=0x8265050, e=0xbfcfc530) at kernel/qapplication.cpp:3791 #21 0x0045806a in KApplication::notify (this=0xbfcfc834, receiver=0x8265050, event=0xbfcfc530) at ../../kdeui/kernel/kapplication.cpp:309 #22 0x00aa911f in KWin::Application::notify (this=0xbfcfc834, o=0x8265050, e=0xbfcfc530) at ../../kwin/main.cpp:372 #23 0x047f31eb in QCoreApplication::notifyInternal (this=0xbfcfc834, receiver=0x8265050, event=0xbfcfc530) at kernel/qcoreapplication.cpp:732 #24 0x04824eb6 in QCoreApplication::sendEvent (this=0x8184e60) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215 #25 QTimerInfoList::activateTimers (this=0x8184e60) at kernel/qeventdispatcher_unix.cpp:602 #26 0x04825017 in QEventDispatcherUNIX::processEvents (this=0x8168af8, flags=...) at kernel/qeventdispatcher_unix.cpp:923 #27 0x051f3f82 in QEventDispatcherX11::processEvents (this=0x8168af8, flags=...) at kernel/qeventdispatcher_x11.cpp:152 #28 0x047f1cb9 in QEventLoop::processEvents (this=0xbfcfc784, flags=) at kernel/qeventloop.cpp:149 #29 0x047f213a in QEventLoop::exec (this=0xbfcfc784, flags=...) at kernel/qeventloop.cpp:201 #30 0x047f66bf in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009 #31 0x05130eb7 in QApplication::exec () at kernel/qapplication.cpp:3665 #32 0x00aab284 in kdemain (argc=1, argv=0xbfcfca94) at ../../kwin/main.cpp:531 #33 0x0804860b in main (argc=1, argv=0xbfcfca94) at kwin_dummy.cpp:3 Possible duplicates by query: bug 241325, bug 241263. Reported using DrKonqi
I'm sorry to say, but you are using a development version with a buggy driver. It crashes in the driver and there is nothing we can do about it.
> I'm sorry to say, but you are using a development version > with a buggy driver. It crashes in the driver and there is nothing we can > do about it. It's OK, it's nice you actually replied. It may appear the most normal behavior, but on Launchpad this bug report would have been left to rot before the "perfect" 10. However, I'm aware I'm using a development version of Kubuntu, with the second release candidate of KDE 4.5, and, well yeah, a crappy driver. And I reported the bug against Kwin exactly for that, because we are encouraged to report crashes occurring on development versions in the hope it may help to improve on them. This time, I hoped in vain, it seems. However, it was only a one-shot thing, so hopefully it won't occur again. Thanks anyway!
you want to report this issue to the developers of the (radeon?) driver, since it will prevent any vsync'ing (alongside direct rendering only?!) *** This bug has been marked as a duplicate of bug 241263 ***
Thanks for your suggestion, I would be very glad to do that, if it could help. But how would I go about that? I mean, I know how to report bugs with DrKonqi, but how should I report this bug to the driver developers? However, although it crashed when I was checking the setting, I have been using the laptop with full desktop effects (and vsync) without issues (so far).
Xorg tracks bugs at https://bugs.freedesktop.org/ - "unfortunately" you need an additional account* there. you can link or copy this bug/stacktrace. > However, although it crashed when I was checking the setting, I have been using... there seems a general problem when re/creating a gl context on the radeon/ati drivers/dri2/whatever, see bug #244820 which has a different backrtace but similar context. *in addition (this is not the preferred way) you can mail xorg@lists.freedesktop.org or (worst and last resort only) lookup a header of the driver for a mail address and contact the developer in person.
Thanks a lot for your time, Thomas! I'll do as you said in the suggested order.
Created attachment 49448 [details] New crash information added by DrKonqi kwin (4.4.93 (KDE 4.4.93 (KDE 4.5 >= 20100713))) on KDE Platform 4.4.93 (KDE 4.4.93 (KDE 4.5 >= 20100713)) using Qt 4.6.3 - What I was doing when the application crashed: Checking (with altering) advanced settings of konsole window. -- Backtrace (Reduced): #6 dri2DrawableGetMSC (psc=0x6ec2d0, pdraw=0x0, ust=0x7fff62dad4c8, msc=0x7fff62dad4c0, sbc=0x7fff62dad4b8) at dri2_glx.c:226 #7 0x00007f3eb19b1185 in __glXGetVideoSyncSGI (count=0x7fff62dad50c) at glxcmds.c:2317 #8 0x00007f3eb3f03c21 in KWin::SceneOpenGL::waitSync (this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.4.93svn1149349/kwin/scene_opengl.cpp:781 #9 0x00007f3eb3f17520 in KWin::SceneOpenGL::flushBuffer (this=0xa99f90, mask=<value optimized out>, damage=...) at /usr/src/debug/kdebase-workspace-4.4.93svn1149349/kwin/scene_opengl.cpp:830 #10 0x00007f3eb3f40956 in KWin::SceneOpenGL::paint (this=0xa99f90, damage=..., toplevels=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.4.93svn1149349/kwin/scene_opengl.cpp:761