Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.1
Operating System: Linux 2.6.30-9-generic x86_64
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
I just had this crash. It may be related to two things: I see it may have to do with the Quick Access widget. Today, I added a second Quick Access widget to my plasmabar, while previously I would only have one; maybe that was the one difference that made this crash.
A second thing which is *most probably* just a coincident, was that I just pasted four lines of regular ASCII text in a KDE application. When I do that again now, nothing happens, so I think that's unrelated.

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Segmentation fault
[Current thread is 0 (LWP 11192)]

Thread 2 (Thread 0x7f52b6740950 (LWP 11253)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f52d6dff4bb in QWaitCondition::wait (this=<value optimized out>, mutex=0x1f1d2b8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f52d32172fc in QHostInfoAgent::run (this=0x1f1d2a0) at kernel/qhostinfo.cpp:260
#3  0x00007f52d6dfe411 in QThreadPrivate::start (arg=0x1f1d2a0) at thread/qthread_unix.cpp:189
#4  0x00007f52d3b5b3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f52d47421bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f52d73b2760 (LWP 11192)):
[KCrash Handler]
#4  0x00007f52d5ffed74 in KDirModel::dirLister (this=0x1c88950) at ../../kio/kio/kdirmodel.cpp:354
#5  0x00007f52cb12a7b6 in KFilePreviewGenerator::Private::updateCutItems (this=0x1e8e2a0) at ../../kfile/kfilepreviewgenerator.cpp:642
#6  0x00007f52cb12b43d in KFilePreviewGenerator::qt_metacall (this=0x1e8e100, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff3efe8930) at ./kfilepreviewgenerator.moc:89
#7  0x00007f52d6ef974c in QMetaObject::activate (sender=0x17c64b0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3120
#8  0x00007f52d4ee81fc in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff3efea1a0) at kernel/qapplication_x11.cpp:3400
#9  0x00007f52d4f10dac in x11EventSourceDispatch (s=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#10 0x00007f52d3dab8fe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#11 0x00007f52d3daefd8 in ?? () from /usr/lib/libglib-2.0.so.0
#12 0x00007f52d3daf100 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#13 0x00007f52d6f0cb66 in QEventDispatcherGlib::processEvents (this=0x178c670, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#14 0x00007f52d4f1055e in QGuiEventDispatcherGlib::processEvents (this=0x1c88950, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#15 0x00007f52d6ee2b12 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#16 0x00007f52d6ee2ee4 in QEventLoop::exec (this=0x7fff3efea4d0, flags=) at kernel/qeventloop.cpp:200
#17 0x00007f52d6ee4f89 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#18 0x00007f52cb38e88f in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../../../plasma/shells/desktop/main.cpp:50
#19 0x0000000000406cd4 in launch (argc=1, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=0, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x40a1e0 "0") at ../../kinit/kinit.cpp:671
#20 0x0000000000407980 in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1163
#21 0x0000000000407f1f in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1356
#22 0x0000000000408ad2 in main (argc=2, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1783

Reported using DrKonqi