Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.61 (KDE 4.3.61 (KDE 4.4 >= 20090717))
Qt Version: 4.5.1
Operating System: Linux 2.6.28-14-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
This crash occured when I opened a text file from the folder view. The file opened in kate like normal, but plasma crashed a second or two after Kate opened. 
Not to create any red herrings, but it could be related to the fact that I have my panel grow whenever a new window is created.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 9550)]

Thread 2 (Thread 0xa9084b90 (LWP 9558)):
#0  0xb7fb5430 in __kernel_vsyscall ()
#1  0xb7d920e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7e0c9ee in QWaitCondition::wait () from /opt/project-neon/lib/libQtCore.so.4
#3  0xb7791082 in ?? () from /opt/project-neon/lib/libQtNetwork.so.4
#4  0xb7e0be10 in ?? () from /opt/project-neon/lib/libQtCore.so.4
#5  0xb7d8e4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb688749e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb6286700 (LWP 9550)):
[KCrash Handler]
#6  0xa9b368f7 in Tasks::itemTopMargin (this=0xbfad04a0) at /build/buildd/kde-nightly-kdebase-20090721+svn1000631/workspace/plasma/applets/tasks/tasks.h:91
#7  0xa9b2e809 in TaskItemLayout::maximumRows (this=0xbfad03c8) at /build/buildd/kde-nightly-kdebase-20090721+svn1000631/workspace/plasma/applets/tasks/taskitemlayout.cpp:189
#8  0xa9b38544 in TaskGroupItem::optimumCapacity (this=0x89e7068) at /build/buildd/kde-nightly-kdebase-20090721+svn1000631/workspace/plasma/applets/tasks/taskgroupitem.cpp:1254
#9  0xa9b2a27a in Tasks::adjustGroupingStrategy (this=0x8716d00) at /build/buildd/kde-nightly-kdebase-20090721+svn1000631/workspace/plasma/applets/tasks/tasks.cpp:227
#10 0xa9b2adef in Tasks::constraintsEvent (this=0x8716d00, constraints={i = -1079179800}) at /build/buildd/kde-nightly-kdebase-20090721+svn1000631/workspace/plasma/applets/tasks/tasks.cpp:161
#11 0xb60137fd in Plasma::Applet::flushPendingConstraintsEvents (this=0x8716d00) at /build/buildd/kde-nightly-kdelibs-20090721+svn1000631/plasma/applet.cpp:1169
#12 0xb6013eef in Plasma::Applet::timerEvent (this=0x8716d00, event=0xbfad0b2c) at /build/buildd/kde-nightly-kdelibs-20090721+svn1000631/plasma/applet.cpp:2119
#13 0xb7f0dacf in QObject::event () from /opt/project-neon/lib/libQtCore.so.4
#14 0xb71a259f in QGraphicsWidget::event () from /opt/project-neon/lib/libQtGui.so.4
#15 0xb6b547fc in QApplicationPrivate::notify_helper () from /opt/project-neon/lib/libQtGui.so.4
#16 0xb6b5d44f in QApplication::notify () from /opt/project-neon/lib/libQtGui.so.4
#17 0xb7526b03 in KApplication::notify (this=0x839bf20, receiver=0x8716d00, event=0xbfad0b2c) at /build/buildd/kde-nightly-kdelibs-20090721+svn1000631/kdeui/kernel/kapplication.cpp:302
#18 0xb7efcb3b in QCoreApplication::notifyInternal () from /opt/project-neon/lib/libQtCore.so.4
#19 0xb7f2a637 in ?? () from /opt/project-neon/lib/libQtCore.so.4
#20 0xb7f27850 in ?? () from /opt/project-neon/lib/libQtCore.so.4
#21 0xb66d1b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#22 0xb66d50eb in ?? () from /usr/lib/libglib-2.0.so.0
#23 0xb66d5268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#24 0xb7f277a8 in QEventDispatcherGlib::processEvents () from /opt/project-neon/lib/libQtCore.so.4
#25 0xb6bef065 in ?? () from /opt/project-neon/lib/libQtGui.so.4
#26 0xb7efb57a in QEventLoop::processEvents () from /opt/project-neon/lib/libQtCore.so.4
#27 0xb7efb73a in QEventLoop::exec () from /opt/project-neon/lib/libQtCore.so.4
#28 0xb7f007b1 in QCoreApplication::exec () from /opt/project-neon/lib/libQtCore.so.4
#29 0xb6b54527 in QApplication::exec () from /opt/project-neon/lib/libQtGui.so.4
#30 0xb506fd48 in kdemain (argc=1, argv=0x83a11e8) at /build/buildd/kde-nightly-kdebase-20090721+svn1000631/workspace/plasma/shells/desktop/main.cpp:112
#31 0x0804e3ad in launch (argc=1, _name=0x83ba164 "/opt/kde-nightly/bin/plasma-desktop", args=0x83ba188 "", cwd=0x0, envc=0, envs=0x83ba18c "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80524a0 "0") at /build/buildd/kde-nightly-kdelibs-20090721+svn1000631/kinit/kinit.cpp:705
#32 0x0804ef67 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde-nightly-kdelibs-20090721+svn1000631/kinit/kinit.cpp:1197
#33 0x0804f6b5 in handle_requests (waitForPid=0) at /build/buildd/kde-nightly-kdelibs-20090721+svn1000631/kinit/kinit.cpp:1390
#34 0x0804fcb4 in main (argc=4, argv=0xbfad1414, envp=0xbfad1428) at /build/buildd/kde-nightly-kdelibs-20090721+svn1000631/kinit/kinit.cpp:1825

This bug may be a duplicate of or related to bug 201386

Reported using DrKonqi