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 i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I was working with a non-KDE app, and Plasma crashed. I do not know if it was related. However, I can state that there was an unresponsive Wine icon in the system tray before the crash, and after the crash that icon is now a taskbar item with a small, empty black window. I do not know if that is related either.

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Segmentation fault
[Current thread is 0 (LWP 7530)]

Thread 2 (Thread 0xa76fdb90 (LWP 7539)):
#0  0xb7fa8430 in __kernel_vsyscall ()
#1  0xb64710e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66512ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7da49b2 in QWaitCondition::wait (this=0x939e6c0, mutex=0x939e6bc, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb76e0152 in QHostInfoAgent::run (this=0x939e6b0) at kernel/qhostinfo.cpp:260
#5  0xb7da396e in QThreadPrivate::start (arg=0x939e6b0) at thread/qthread_unix.cpp:189
#6  0xb646d4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb664249e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5f7ba10 (LWP 7530)):
[KCrash Handler]
#6  0xa95b31ad in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#7  0xa95c57dd in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#8  0xa95b0bfb in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#9  0xb7eadca8 in QMetaObject::activate (sender=0x95895a0, from_signal_index=5, to_signal_index=5, argv=0x0) at kernel/qobject.cpp:3069
#10 0xb7eae932 in QMetaObject::activate (sender=0x95895a0, m=0xa95e2fe0, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3143
#11 0xa95af9d7 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#12 0xa95b554b in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#13 0xa95b0b23 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#14 0xa95b0bba in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#15 0xb7eadca8 in QMetaObject::activate (sender=0x8ffd3f0, from_signal_index=7, to_signal_index=7, argv=0xbfbc3468) at kernel/qobject.cpp:3069
#16 0xb7eae932 in QMetaObject::activate (sender=0x8ffd3f0, m=0xa95a0e44, local_signal_index=0, argv=0xbfbc3468) at kernel/qobject.cpp:3143
#17 0xa9599b59 in NetworkManagerSettings::connectionAdded () from /usr/lib/libknmdbus.so.4
#18 0xa959b68f in NetworkManagerSettings::onConnectionAdded () from /usr/lib/libknmdbus.so.4
#19 0xa959b8ad in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#20 0xb7eadca8 in QMetaObject::activate (sender=0x8ffd3f0, from_signal_index=5, to_signal_index=5, argv=0xbfbc35fc) at kernel/qobject.cpp:3069
#21 0xb7eae932 in QMetaObject::activate (sender=0x8ffd3f0, m=0xa95a0df0, local_signal_index=0, argv=0xbfbc35fc) at kernel/qobject.cpp:3143
#22 0xa9599483 in OrgFreedesktopNetworkManagerSettingsInterface::NewConnection () from /usr/lib/libknmdbus.so.4
#23 0xa95996da in OrgFreedesktopNetworkManagerSettingsInterface::qt_metacall () from /usr/lib/libknmdbus.so.4
#24 0xa959b80a in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#25 0xb724cd7a in QDBusConnectionPrivate::deliverCall (this=0x9064750, object=0x8ffd3f0, msg=@0xa36c4dc, metaTypes=@0xa36c4e0, slotIdx=5) at qdbusintegrator.cpp:891
#26 0xb7255187 in QDBusCallDeliveryEvent::placeMetaCall (this=0xa36c4b0, object=0x8ffd3f0) at qdbusintegrator_p.h:101
#27 0xb7ea83a0 in QObject::event (this=0x8ffd3f0, e=0xa36c4b0) at kernel/qobject.cpp:1118
#28 0xb6927e9c in QApplicationPrivate::notify_helper (this=0x8d7b340, receiver=0x8ffd3f0, e=0xa36c4b0) at kernel/qapplication.cpp:4084
#29 0xb693019e in QApplication::notify (this=0x8d75440, receiver=0x8ffd3f0, e=0xa36c4b0) at kernel/qapplication.cpp:3631
#30 0xb7461e8d in KApplication::notify (this=0x8d75440, receiver=0x8ffd3f0, event=0xa36c4b0) at /build/buildd/kde4libs-4.2.90/kdeui/kernel/kapplication.cpp:302
#31 0xb7e97a3b in QCoreApplication::notifyInternal (this=0x8d75440, receiver=0x8ffd3f0, event=0xa36c4b0) at kernel/qcoreapplication.cpp:602
#32 0xb7e98695 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8d0ef00) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#33 0xb7e9888d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1132
#34 0xb7ec37ef in postEventSourceDispatch (s=0x8d7d520) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#35 0xb64bab88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0xb64be0eb in ?? () from /usr/lib/libglib-2.0.so.0
#37 0xb64be268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0xb7ec3438 in QEventDispatcherGlib::processEvents (this=0x8d78b38, flags={i = -1078182392}) at kernel/qeventdispatcher_glib.cpp:323
#39 0xb69c9365 in QGuiEventDispatcherGlib::processEvents (this=0x8d78b38, flags={i = -1078182344}) at kernel/qguieventdispatcher_glib.cpp:202
#40 0xb7e9606a in QEventLoop::processEvents (this=0xbfbc3eb0, flags={i = -1078182280}) at kernel/qeventloop.cpp:149
#41 0xb7e964aa in QEventLoop::exec (this=0xbfbc3eb0, flags={i = -1078182216}) at kernel/qeventloop.cpp:200
#42 0xb7e98959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#43 0xb6927d17 in QApplication::exec () at kernel/qapplication.cpp:3553
#44 0xb4ad9820 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#45 0x0804e1c0 in launch (argc=1, _name=0x8d629b4 "/usr/bin/plasma-desktop", args=0x8d629cc "", cwd=0x0, envc=0, envs=0x8d629d0 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80512d0 "0") at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:671
#46 0x0804e99d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1163
#47 0x0804ef25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1356
#48 0x0804fb0a in main (argc=2, argv=0xbfbc46a4, envp=0xbfbc46b0) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1783

Reported using DrKonqi