Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.29.6-217.2.16.fc11.x86_64 x86_64
Distribution: "Fedora release 11 (Leonidas)"

What I was doing when the application crashed:
os: fedora-11 x86_64
computer was idle (blank screen screen saver).
when resuming operation, a crash report appeared

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f56ada8a860 (LWP 2594))]

Thread 2 (Thread 0x7f56877db910 (LWP 2595)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f56a8d4bd7b in QWaitConditionPrivate::wait (time=<value optimized out>, this=<value optimized out>) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (time=<value optimized out>, this=<value optimized out>) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f56ac49fdac in QHostInfoAgent::run (this=0x264e760) at kernel/qhostinfo.cpp:260
#4  0x00007f56a8d4acd5 in QThreadPrivate::start (arg=0x264e760) at thread/qthread_unix.cpp:188
#5  0x00007f56a8adb86a in start_thread (arg=<value optimized out>) at pthread_create.c:297
#6  0x00007f56a809d39d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f56ada8a860 (LWP 2594)):
[KCrash Handler]
#5  0x00007f56aadd11e0 in XVisualIDFromVisual () from /usr/lib64/libX11.so.6
#6  0x00007f56a959f22f in qt_x11_getX11InfoForWindow (xinfo=0x314f348, att=<value optimized out>) at kernel/qwidget_x11.cpp:2896
#7  0x00007f56a959f2c0 in qt_x11_getX11InfoForWindow (xinfo=0x0, a=<value optimized out>) at kernel/qwidget_x11.cpp:400
#8  0x00007f56a95a6b56 in QWidgetPrivate::create_sys (this=0x314f1b0, window=<value optimized out>, initializeWindow=<value optimized out>, destroyOldWindow=<value optimized out>)
    at kernel/qwidget_x11.cpp:545
#9  0x00007f56a956d72b in QWidget::create (this=0x1e5e250, window=30307161, initializeWindow=192, destroyOldWindow=96) at kernel/qwidget.cpp:1253
#10 0x00007f568939ed99 in Plasma::Theme::font(Plasma::Theme::FontRole) const () at /usr/src/debug/kdelibs-4.3.0/plasma/theme.cpp:615
#11 0x00007f568939aae8 in Plasma::Theme::font(Plasma::Theme::FontRole) const () at /usr/src/debug/kdelibs-4.3.0/plasma/theme.cpp:615
#12 0x00007f568939abc4 in Plasma::Theme::font(Plasma::Theme::FontRole) const () at /usr/src/debug/kdelibs-4.3.0/plasma/theme.cpp:615
#13 0x00007f56a8e45fdc in QMetaObject::activate (sender=0x318ed80, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1de5160) at kernel/qobject.cpp:3113
#14 0x00007f56a8e4afdf in QSingleShotTimer::timerEvent (this=0x318ed80) at kernel/qtimer.cpp:298
#15 0x00007f56a8e3ff93 in QObject::event (this=0x318ed80, e=0x1) at kernel/qobject.cpp:1075
#16 0x00007f56a951d69c in QApplicationPrivate::notify_helper (this=0x1dbb7f0, receiver=0x318ed80, e=0x7fffc360d5c0) at kernel/qapplication.cpp:4056
#17 0x00007f56a95246ce in QApplication::notify (this=0x1da2580, receiver=0x318ed80, e=0x7fffc360d5c0) at kernel/qapplication.cpp:4021
#18 0x00007f56abde0296 in KApplication::notify (this=0x1da2580, receiver=0x318ed80, event=0x7fffc360d5c0) at /usr/src/debug/kdelibs-4.3.0/kdeui/kernel/kapplication.cpp:302
#19 0x00007f56a8e30cbc in QCoreApplication::notifyInternal (this=0x1da2580, receiver=0x318ed80, event=0x7fffc360d5c0) at kernel/qcoreapplication.cpp:610
#20 0x00007f56a8e5ba72 in QCoreApplication::sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#21 QTimerInfoList::activateTimers (event=<value optimized out>, receiver=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:572
#22 0x00007f56a8e5946d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#23 0x00007f56a4679abe in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#24 0x00007f56a467d278 in ?? () from /lib64/libglib-2.0.so.0
#25 0x00007f56a467d3a0 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#26 0x00007f56a8e593b6 in QEventDispatcherGlib::processEvents (this=0x1d8a2a0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#27 0x00007f56a95b042e in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#28 0x00007f56a8e2f5f2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 36}) at kernel/qeventloop.cpp:149
#29 0x00007f56a8e2f9c4 in QEventLoop::exec (this=0x7fffc360d860, flags={i = 0}) at kernel/qeventloop.cpp:201
#30 0x00007f56a8e31b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#31 0x00007f56ad790eaf in kdemain () from /usr/lib64/libkdeinit4_plasma-desktop.so
#32 0x00007f56a7fdda2d 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=0x7fffc360db68) at libc-start.c:220
#33 0x0000000000400779 in _start ()

Reported using DrKonqi