Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31.4-manav-kernel i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
The Notification and Jobs pop-up showed that there are 8 bug-fixes and updates available. I clicked on Review and Update button. Then, in the Click and Install Updates window, i clicked Select All Updates and then clicked Apply. Then, in another window, the title came as "Querying" after which the application crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb57cf700 (LWP 2083))]

Thread 2 (Thread 0xa8acbb70 (LWP 2084)):
#0  0xb7806430 in __kernel_vsyscall ()
#1  0xb5f29e15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0xb60ee87d in __pthread_cond_wait (cond=0x9c1a7d0, mutex=0x9c1a7b8) at forward.c:139
#3  0xb7604e67 in QWaitConditionPrivate::wait (this=0x9c1e458, mutex=0x9c1e454, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x9c1e458, mutex=0x9c1e454, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0xb5e3b922 in QHostInfoAgent::run (this=0x9c1e448) at kernel/qhostinfo.cpp:260
#6  0xb7603e32 in QThreadPrivate::start (arg=0x9c1e448) at thread/qthread_unix.cpp:188
#7  0xb5f2580e in start_thread (arg=0xa8acbb70) at pthread_create.c:300
#8  0xb60e18de in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb57cf700 (LWP 2083)):
[KCrash Handler]
#6  0xb7228d57 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0xb63fc70e in qt_x11_getX11InfoForWindow (xinfo=0x9ec7944, a=...) at kernel/qwidget_x11.cpp:400
#8  0xb6403b4e in QWidgetPrivate::create_sys (this=0x9ec7850, window=31467951, initializeWindow=true, destroyOldWindow=true) at kernel/qwidget_x11.cpp:545
#9  0xb63c4b1c in QWidget::create (this=0x9ea6748, window=31467951, initializeWindow=true, destroyOldWindow=<value optimized out>) at kernel/qwidget.cpp:1253
#10 0xa8d08c1e in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0xa8d043f0 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0xa8d044cb in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#13 0xb770a263 in QMetaObject::activate (sender=0x963ff18, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#14 0xb770aec2 in QMetaObject::activate (sender=0x963ff18, m=0xb77e4908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#15 0xb770f387 in QSingleShotTimer::timeout (this=0x963ff18) at .moc/release-shared/qtimer.moc:76
#16 0xb770f49c in QSingleShotTimer::timerEvent (this=0x963ff18) at kernel/qtimer.cpp:298
#17 0xb77043bf in QObject::event (this=0x963ff18, e=0xbfcd87a0) at kernel/qobject.cpp:1075
#18 0xb636df54 in QApplicationPrivate::notify_helper (this=0x9573160, receiver=0x963ff18, e=0xbfcd87a0) at kernel/qapplication.cpp:4056
#19 0xb637567c in QApplication::notify (this=0x956d3c8, receiver=0x963ff18, e=0xbfcd87a0) at kernel/qapplication.cpp:3603
#20 0xb6dbdbfa in KApplication::notify (this=0x956d3c8, receiver=0x963ff18, event=0xbfcd87a0) at ../../kdeui/kernel/kapplication.cpp:302
#21 0xb76f46cb in QCoreApplication::notifyInternal (this=0x956d3c8, receiver=0x963ff18, event=0xbfcd87a0) at kernel/qcoreapplication.cpp:610
#22 0xb77217ce in QCoreApplication::sendEvent (this=0x9577134) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#23 QTimerInfoList::activateTimers (this=0x9577134) at kernel/qeventdispatcher_unix.cpp:572
#24 0xb771f0e0 in timerSourceDispatch (source=0x9577100) at kernel/qeventdispatcher_glib.cpp:165
#25 0xb5f71e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0xb5f75730 in ?? () from /lib/libglib-2.0.so.0
#27 0xb5f75863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0xb771f02c in QEventDispatcherGlib::processEvents (this=0x9572f20, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#29 0xb640ebe5 in QGuiEventDispatcherGlib::processEvents (this=0x9572f20, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#30 0xb76f2c79 in QEventLoop::processEvents (this=0xbfcd8a64, flags=) at kernel/qeventloop.cpp:149
#31 0xb76f30ca in QEventLoop::exec (this=0xbfcd8a64, flags=...) at kernel/qeventloop.cpp:201
#32 0xb76f553f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#33 0xb636ddd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#34 0xb432680d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#35 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x95547e8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#36 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#37 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#38 0x0804fbaf in main (argc=2, argv=0xbfcd92c4, envp=0xbfcd92d0) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi