Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Opening Kmail caused the plasma desktop to crash

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4103)]

Thread 3 (Thread 0x7fa78829e950 (LWP 4104)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fa7a88f6d19 in QWaitCondition::wait (this=0x278a270, mutex=0x278a268, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007fa7a777c81c in QHostInfoAgent::run (this=0x278a250) at kernel/qhostinfo.cpp:260
#3  0x00007fa7a88f5d35 in QThreadPrivate::start (arg=0x278a250) at thread/qthread_unix.cpp:188
#4  0x00007fa7a47ea3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007fa7a53cefcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fa786247950 (LWP 4124)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:217
#1  0x00007fa7a88f6cf7 in QWaitCondition::wait (this=0x2434b38, mutex=0x2434b30, time=30000) at thread/qwaitcondition_unix.cpp:85
#2  0x00007fa7a88ec929 in QThreadPoolThread::run (this=0x1ef4c30) at concurrent/qthreadpool.cpp:140
#3  0x00007fa7a88f5d35 in QThreadPrivate::start (arg=0x1ef4c30) at thread/qthread_unix.cpp:188
#4  0x00007fa7a47ea3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007fa7a53cefcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa7a8ec0750 (LWP 4103)):
[KCrash Handler]
#5  AbstractTaskItem::basicPreferredSize (this=0x38e9080) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/tasks.h:92
#6  0x00007fa7894404c2 in TaskItemLayout::maximumRows (this=0x2903c30) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/taskitemlayout.cpp:185
#7  0x00007fa789448b37 in TaskGroupItem::optimumCapacity (this=0x290c520) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/taskgroupitem.cpp:1224
#8  0x00007fa78943bdf0 in Tasks::adjustGroupingStrategy (this=0x23ffc60) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/tasks.cpp:241
#9  0x00007fa78943c008 in Tasks::constraintsEvent (this=0x23ffc60, constraints={i = -1522379480}) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/tasks.cpp:165
#10 0x00007fa7a02ffe69 in Plasma::Applet::flushPendingConstraintsEvents (this=0x23ffc60) at /build/buildd/kde4libs-4.3.1/plasma/applet.cpp:1173
#11 0x00007fa7a03004b5 in Plasma::Applet::timerEvent (this=0x23ffc60, event=<value optimized out>) at /build/buildd/kde4libs-4.3.1/plasma/applet.cpp:2120
#12 0x00007fa7a89ef263 in QObject::event (this=0x23ffc60, e=0x7fa7a5425528) at kernel/qobject.cpp:1075
#13 0x00007fa7a659818b in QGraphicsWidget::event (this=0x23ffc60, event=0x7fffb0ef17b0) at graphicsview/qgraphicswidget.cpp:1340
#14 0x00007fa7a5fa5f4d in QApplicationPrivate::notify_helper (this=0x1efced0, receiver=0x23ffc60, e=0x7fffb0ef17b0) at kernel/qapplication.cpp:4056
#15 0x00007fa7a5fae18a in QApplication::notify (this=0x1ebe060, receiver=0x23ffc60, e=0x7fffb0ef17b0) at kernel/qapplication.cpp:4021
#16 0x00007fa7a70b8deb in KApplication::notify (this=0x1ebe060, receiver=0x23ffc60, event=0x7fffb0ef17b0) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#17 0x00007fa7a89df6ac in QCoreApplication::notifyInternal (this=0x1ebe060, receiver=0x23ffc60, event=0x7fffb0ef17b0) at kernel/qcoreapplication.cpp:610
#18 0x00007fa7a8a0c516 in QTimerInfoList::activateTimers (this=0x1f00480) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#19 0x00007fa7a8a08b2d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#20 0x00007fa7a4a3920a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0x00007fa7a4a3c8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#22 0x00007fa7a4a3ca7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#23 0x00007fa7a8a08a8f in QEventDispatcherGlib::processEvents (this=0x1efca00, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#24 0x00007fa7a603ebdf in QGuiEventDispatcherGlib::processEvents (this=0x3b0070006f0074, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#25 0x00007fa7a89ddf42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -1326507488}) at kernel/qeventloop.cpp:149
#26 0x00007fa7a89de314 in QEventLoop::exec (this=0x7fffb0ef1a60, flags={i = -1326507408}) at kernel/qeventloop.cpp:201
#27 0x00007fa7a89e05e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#28 0x00007fa79c91f3eb in kdemain (argc=1, argv=0x1eb0c30) at /build/buildd/kdebase-workspace-4.3.1/plasma/shells/desktop/main.cpp:50
#29 0x0000000000407215 in launch (argc=1, _name=0x1eb10d8 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x1eb10f8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a3a1 "0") at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:677
#30 0x0000000000407a38 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1169
#31 0x0000000000407fe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1362
#32 0x0000000000408b26 in main (argc=2, argv=0x7fffb0ef2908, envp=0x7fffb0ef2920) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1793

Reported using DrKonqi