Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.98 (KDE 4.2.98 (KDE 4.3 RC3))
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 run kvm-88, after some seconds I start a virtual machine, just around the time guest reaching grup menu list, plasma of the host crashes.
KVM command line is:
sudo /opt/kvm/bin/qemu-system-x86_64 -snapshot -boot c -hda debian32_sid.img -m 384 -localtime -net nic,vlan=0,macaddr=00:16:3e:00:00:11,model=virtio -net tap -usb -usbdevice tablet -name Debian_Sid32_SNAPSHOT
Can't tell if worked fine before because of an older kvm version, or a older KDE one. 

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4192)]

Thread 2 (Thread 0xa9254b90 (LWP 4196)):
#0  0xb800c430 in __kernel_vsyscall ()
#1  0xb64ce0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66ae2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7e049b2 in QWaitCondition::wait (this=0x94869e8, mutex=0x94869e4, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb773d152 in QHostInfoAgent::run (this=0x94869d8) at kernel/qhostinfo.cpp:260
#5  0xb7e0396e in QThreadPrivate::start (arg=0x94869d8) at thread/qthread_unix.cpp:189
#6  0xb64ca4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb669f49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5fd8a10 (LWP 4192)):
[KCrash Handler]
#6  0xa93d01ad in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#7  0xa93e27dd in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#8  0xa93cdbfb in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#9  0xb7f0dca8 in QMetaObject::activate (sender=0x95118b0, from_signal_index=5, to_signal_index=5, argv=0x0) at kernel/qobject.cpp:3069
#10 0xb7f0e932 in QMetaObject::activate (sender=0x95118b0, m=0xa93fffe0, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3143
#11 0xa93cc9d7 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#12 0xa93d254b in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#13 0xa93cdb23 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#14 0xa93cdbba in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#15 0xb7f0dca8 in QMetaObject::activate (sender=0x91b6b90, from_signal_index=7, to_signal_index=7, argv=0xbfe27858) at kernel/qobject.cpp:3069
#16 0xb7f0e932 in QMetaObject::activate (sender=0x91b6b90, m=0xa93a1e44, local_signal_index=0, argv=0xbfe27858) at kernel/qobject.cpp:3143
#17 0xa939ab59 in NetworkManagerSettings::connectionAdded () from /usr/lib/libknmdbus.so.4
#18 0xa939c68f in NetworkManagerSettings::onConnectionAdded () from /usr/lib/libknmdbus.so.4
#19 0xa939c8ad in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#20 0xb7f0dca8 in QMetaObject::activate (sender=0x91b6b90, from_signal_index=5, to_signal_index=5, argv=0xbfe279ec) at kernel/qobject.cpp:3069
#21 0xb7f0e932 in QMetaObject::activate (sender=0x91b6b90, m=0xa93a1df0, local_signal_index=0, argv=0xbfe279ec) at kernel/qobject.cpp:3143
#22 0xa939a483 in OrgFreedesktopNetworkManagerSettingsInterface::NewConnection () from /usr/lib/libknmdbus.so.4
#23 0xa939a6da in OrgFreedesktopNetworkManagerSettingsInterface::qt_metacall () from /usr/lib/libknmdbus.so.4
#24 0xa939c80a in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#25 0xb72a9d7a in QDBusConnectionPrivate::deliverCall (this=0x921e628, object=0x91b6b90, msg=@0x97167ac, metaTypes=@0x97167b0, slotIdx=5) at qdbusintegrator.cpp:891
#26 0xb72b2187 in QDBusCallDeliveryEvent::placeMetaCall (this=0x9716780, object=0x91b6b90) at qdbusintegrator_p.h:101
#27 0xb7f083a0 in QObject::event (this=0x91b6b90, e=0x9716780) at kernel/qobject.cpp:1118
#28 0xb6984e9c in QApplicationPrivate::notify_helper (this=0x8dc7d20, receiver=0x91b6b90, e=0x9716780) at kernel/qapplication.cpp:4084
#29 0xb698d19e in QApplication::notify (this=0x8dc2238, receiver=0x91b6b90, e=0x9716780) at kernel/qapplication.cpp:3631
#30 0xb74bf5cd in KApplication::notify (this=0x8dc2238, receiver=0x91b6b90, event=0x9716780) at /build/buildd/kde4libs-4.2.98a/kdeui/kernel/kapplication.cpp:302
#31 0xb7ef7a3b in QCoreApplication::notifyInternal (this=0x8dc2238, receiver=0x91b6b90, event=0x9716780) at kernel/qcoreapplication.cpp:602
#32 0xb7ef8695 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8d62b38) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#33 0xb7ef888d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1132
#34 0xb7f237ef in postEventSourceDispatch (s=0x8dc9d10) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#35 0xb6517b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0xb651b0eb in ?? () from /usr/lib/libglib-2.0.so.0
#37 0xb651b268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0xb7f23438 in QEventDispatcherGlib::processEvents (this=0x8dc7878, flags={i = -1075674632}) at kernel/qeventdispatcher_glib.cpp:323
#39 0xb6a26365 in QGuiEventDispatcherGlib::processEvents (this=0x8dc7878, flags={i = -1075674584}) at kernel/qguieventdispatcher_glib.cpp:202
#40 0xb7ef606a in QEventLoop::processEvents (this=0xbfe282a0, flags={i = -1075674520}) at kernel/qeventloop.cpp:149
#41 0xb7ef64aa in QEventLoop::exec (this=0xbfe282a0, flags={i = -1075674456}) at kernel/qeventloop.cpp:200
#42 0xb7ef8959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#43 0xb6984d17 in QApplication::exec () at kernel/qapplication.cpp:3553
#44 0xb4b2e5d0 in kdemain (argc=1, argv=0x8d8f8d8) at /build/buildd/kdebase-workspace-4.2.98/plasma/shells/desktop/main.cpp:50
#45 0x0804e27d in launch (argc=1, _name=0x8d6357c "/usr/bin/plasma-desktop", args=0x8d63594 "", cwd=0x0, envc=0, envs=0x8d63598 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x8051391 "0") at /build/buildd/kde4libs-4.2.98a/kinit/kinit.cpp:676
#46 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.98a/kinit/kinit.cpp:1168
#47 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.98a/kinit/kinit.cpp:1361
#48 0x0804fbca in main (argc=2, argv=0xbfe28a94, envp=0xbfe28aa0) at /build/buildd/kde4libs-4.2.98a/kinit/kinit.cpp:1788

Reported using DrKonqi