Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.96 (KDE 4.2.96 (KDE 4.3 RC2))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-13-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I was using Firefox, and plasma crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3431)]

Thread 2 (Thread 0xa70ffb90 (LWP 3438)):
#0  0xb7fc0430 in __kernel_vsyscall ()
#1  0xb64870e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66672ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7dbb9b2 in QWaitCondition::wait (this=0x86a1e70, mutex=0x86a1e6c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb76f6152 in QHostInfoAgent::run (this=0x86a1e60) at kernel/qhostinfo.cpp:260
#5  0xb7dba96e in QThreadPrivate::start (arg=0x86a1e60) at thread/qthread_unix.cpp:189
#6  0xb64834ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb665849e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5f91a10 (LWP 3431)):
[KCrash Handler]
#6  0xb7888bda in KDirModel::dirLister (this=0x94a1410) at /build/buildd/kde4libs-4.2.96/kio/kio/kdirmodel.cpp:353
#7  0xb5c48d1e in KFilePreviewGenerator::qt_metacall (this=0x94a1348, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbfedd258)
    at /build/buildd/kde4libs-4.2.96/obj-i486-linux-gnu/kfile/kfilepreviewgenerator.moc:89
#8  0xb7ec4ca8 in QMetaObject::activate (sender=0x820b330, from_signal_index=7, to_signal_index=7, argv=0x0) at kernel/qobject.cpp:3069
#9  0xb7ec5932 in QMetaObject::activate (sender=0x820b330, m=0xb71d95a8, local_signal_index=3, argv=0x0) at kernel/qobject.cpp:3143
#10 0xb6fef597 in QClipboard::dataChanged (this=0x820b330) at .moc/release-shared/moc_qclipboard.cpp:108
#11 0xb69b4e3a in QApplication::x11ProcessEvent (this=0x81c2580, event=0xbfedd76c) at kernel/qapplication_x11.cpp:3377
#12 0xb69dfc6a in x11EventSourceDispatch (s=0x81cb100, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#13 0xb64d0b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#14 0xb64d40eb in ?? () from /usr/lib/libglib-2.0.so.0
#15 0xb64d4268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#16 0xb7eda438 in QEventDispatcherGlib::processEvents (this=0x81c5ab8, flags={i = -1074931416}) at kernel/qeventdispatcher_glib.cpp:323
#17 0xb69df365 in QGuiEventDispatcherGlib::processEvents (this=0x81c5ab8, flags={i = -1074931368}) at kernel/qguieventdispatcher_glib.cpp:202
#18 0xb7ead06a in QEventLoop::processEvents (this=0xbfedd9d0, flags={i = -1074931304}) at kernel/qeventloop.cpp:149
#19 0xb7ead4aa in QEventLoop::exec (this=0xbfedd9d0, flags={i = -1074931240}) at kernel/qeventloop.cpp:200
#20 0xb7eaf959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#21 0xb693dd17 in QApplication::exec () at kernel/qapplication.cpp:3553
#22 0xb4ae95d0 in kdemain (argc=1, argv=0x81af678) at /build/buildd/kdebase-workspace-4.2.96/plasma/shells/desktop/main.cpp:50
#23 0x0804e27d in launch (argc=1, _name=0x815e324 "/usr/bin/plasma-desktop", args=0x815e33c "", cwd=0x0, envc=0, envs=0x815e340 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x8051391 "0") at /build/buildd/kde4libs-4.2.96/kinit/kinit.cpp:676
#24 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.96/kinit/kinit.cpp:1168
#25 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.96/kinit/kinit.cpp:1361
#26 0x0804fbca in main (argc=2, argv=0xbfede1c4, envp=0xbfede1d0) at /build/buildd/kde4libs-4.2.96/kinit/kinit.cpp:1788

Reported using DrKonqi