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: 4.5.0
Operating System: Linux 2.6.28-13-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Plasma crashes regularly while using arbitrary applications like Konsole, Firefox, etc.

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Segmentation fault
[Current thread is 0 (LWP 3922)]

Thread 2 (Thread 0x7f91a3d09950 (LWP 3929)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f91c41cc939 in QWaitCondition::wait (this=0x1d5cbc0, mutex=0x1d5cbb8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f91c30494cc in QHostInfoAgent::run (this=0x1d5cba0) at kernel/qhostinfo.cpp:260
#3  0x00007f91c41cb952 in QThreadPrivate::start (arg=0x1d5cba0) at thread/qthread_unix.cpp:189
#4  0x00007f91c004d3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f91c0c31fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f91c4790750 (LWP 3922)):
[KCrash Handler]
#5  memcpy () at ../sysdeps/x86_64/memcpy.S:506
#6  0x00007f91c41ef82c in QListData::detach2 (this=0x7fffcc7c80c0) at /usr/include/bits/string3.h:52
#7  0x00007f91a66fb6f3 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#8  0x00007f91a66fa58f in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#9  0x00007f91a670b9cc in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#10 0x00007f91a66f8700 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#11 0x00007f91c42ca1f2 in QMetaObject::activate (sender=0x1e1da40, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x7198c3) at kernel/qobject.cpp:3069
#12 0x00007f91a66fc6f8 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#13 0x00007f91a66f8633 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#14 0x00007f91a66f86a5 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#15 0x00007f91c42ca1f2 in QMetaObject::activate (sender=0x1a47670, from_signal_index=<value optimized out>, to_signal_index=7, argv=0x7198c3) at kernel/qobject.cpp:3069
#16 0x00007f91a64d7854 in NetworkManagerSettings::connectionAdded () from /usr/lib/libknmdbus.so.4
#17 0x00007f91a64d91f3 in NetworkManagerSettings::onConnectionAdded () from /usr/lib/libknmdbus.so.4
#18 0x00007f91a64d93f4 in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#19 0x00007f91c42ca1f2 in QMetaObject::activate (sender=0x1a47670, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x7198c3) at kernel/qobject.cpp:3069
#20 0x00007f91a64d7282 in OrgFreedesktopNetworkManagerSettingsInterface::NewConnection () from /usr/lib/libknmdbus.so.4
#21 0x00007f91a64d742c in OrgFreedesktopNetworkManagerSettingsInterface::qt_metacall () from /usr/lib/libknmdbus.so.4
#22 0x00007f91a64d9355 in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#23 0x00007f91c2525f83 in QDBusConnectionPrivate::deliverCall (this=0x19fd000, object=0x1a47670, msg=@0x2522868, metaTypes=@0x2522870, slotIdx=5) at qdbusintegrator.cpp:891
#24 0x00007f91c252dd0f in QDBusCallDeliveryEvent::placeMetaCall (this=0x0, object=0x2958ff0) at qdbusintegrator_p.h:101
#25 0x00007f91c42c4848 in QObject::event (this=0x1a47670, e=0x2522820) at kernel/qobject.cpp:1118
#26 0x00007f91c183e78d in QApplicationPrivate::notify_helper (this=0x14e8e80, receiver=0x1a47670, e=0x2522820) at kernel/qapplication.cpp:4084
#27 0x00007f91c184697a in QApplication::notify (this=0x14a7dd0, receiver=0x1a47670, e=0x2522820) at kernel/qapplication.cpp:4049
#28 0x00007f91c298106b in KApplication::notify (this=0x14a7dd0, receiver=0x1a47670, event=0x2522820) at /build/buildd/kde4libs-4.2.90/kdeui/kernel/kapplication.cpp:302
#29 0x00007f91c42b475c in QCoreApplication::notifyInternal (this=0x14a7dd0, receiver=0x1a47670, event=0x2522820) at kernel/qcoreapplication.cpp:602
#30 0x00007f91c42b53ca in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x144e100) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#31 0x00007f91c42de1e3 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#32 0x00007f91c029c20a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#33 0x00007f91c029f8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#34 0x00007f91c029fa7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#35 0x00007f91c42dde6f in QEventDispatcherGlib::processEvents (this=0x14e8310, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#36 0x00007f91c18d6bef in QGuiEventDispatcherGlib::processEvents (this=0x7f91690f8090, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#37 0x00007f91c42b3002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -864251152}) at kernel/qeventloop.cpp:149
#38 0x00007f91c42b33cd in QEventLoop::exec (this=0x7fffcc7c9330, flags={i = -864251072}) at kernel/qeventloop.cpp:200
#39 0x00007f91c42b5694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#40 0x00007f91b8e587eb in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#41 0x000000000040714e in launch (argc=1, _name=0x14b4e88 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x14b4ea8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a308 "0") at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:671
#42 0x0000000000407978 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1163
#43 0x0000000000407f25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1356
#44 0x0000000000408a66 in main (argc=2, argv=0x7fffcc7ca1c8, envp=0x7fffcc7ca1e0) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1783

Reported using DrKonqi