Version:            (using KDE 4.3.1)
OS:                Linux
Installed from:    Debian stable Packages

approx 90% of the time when I plug in or unplug my WM 6.1 smartphone with internet sharing, Plasma crashes.  Once in a while, I will get a complete system lockup with no display and need to reboot dirty.  Tried to backtrace, but got an error saying "Unable to create a valid backtrace."  However, backtrace does come up (only a partial maybe?):  

[Thread debugging using libthread_db enabled]
[New Thread 0xb3c37730 (LWP 4380)]
[New Thread 0xa3e2db90 (LWP 4382)]
[New Thread 0xa84f8b90 (LWP 4381)]
(no debugging symbols found)
(no debugging symbols found)
0xb7f50430 in __kernel_vsyscall ()
[Current thread is 0 (LWP 4380)]

Thread 3 (Thread 0xa84f8b90 (LWP 4381)):
#0  0xb7f50430 in __kernel_vsyscall ()
#1  0xb50a20e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb629e2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb648a9b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb790b152 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb648996e in ?? () from /usr/lib/libQtCore.so.4
#6  0xb509e4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb628f49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa3e2db90 (LWP 4382)):
#0  0xb7f50430 in __kernel_vsyscall ()
#1  0xb50a20e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb629e2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb648a9b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa864bb9a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#5  0xb648996e in ?? () from /usr/lib/libQtCore.so.4
#6  0xb509e4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb628f49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb3c37730 (LWP 4380)):
#0  0xb7f50430 in __kernel_vsyscall ()
#1  0xb624a7a6 in nanosleep () from /lib/tls/i686/cmov/libc.so.6
#2  0xb624a5be in sleep () from /lib/tls/i686/cmov/libc.so.6
#3  0xb76f28b2 in ?? () from /usr/lib/libkdeui.so.5
#4  0xb76f3274 in KCrash::defaultCrashHandler () from /usr/lib/libkdeui.so.5
#5  <signal handler called>
#6  0xa86e21ad in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#7  0xa86f47dd in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#8  0xa86dfbfb in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#9  0xb6593ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0xb6594932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#11 0xa86de9d7 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#12 0xa86e3f1d in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#13 0xa86e4610 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#14 0xa86f3bca in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#15 0xa86dfc23 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#16 0xb6593ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#17 0xb6594932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xa86de9d7 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#19 0xa86e454b in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#20 0xa86dfb23 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#21 0xa86dfbba in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#22 0xb6593ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb6594932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xa86b2b59 in NetworkManagerSettings::connectionAdded () from /usr/lib/libknmdbus.so.4
#25 0xa86b468f in NetworkManagerSettings::onConnectionAdded () from /usr/lib/libknmdbus.so.4
#26 0xa86b48ad in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#27 0xb6593ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#28 0xb6594932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#29 0xa86b2483 in OrgFreedesktopNetworkManagerSettingsInterface::NewConnection () from /usr/lib/libknmdbus.so.4
#30 0xa86b26da in OrgFreedesktopNetworkManagerSettingsInterface::qt_metacall () from /usr/lib/libknmdbus.so.4
#31 0xa86b480a in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#32 0xb6696d7a in ?? () from /usr/lib/libQtDBus.so.4
#33 0xb669f187 in ?? () from /usr/lib/libQtDBus.so.4
#34 0xb658e3a0 in QObject::event () from /usr/lib/libQtCore.so.4
#35 0xb682ae9c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#36 0xb683319e in QApplication::notify () from /usr/lib/libQtGui.so.4
#37 0xb768294d in KApplication::notify () from /usr/lib/libkdeui.so.5
#38 0xb657da3b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#39 0xb657e695 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#40 0xb657e88d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#41 0xb65a97ef in ?? () from /usr/lib/libQtCore.so.4
#42 0xb4e9cb88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#43 0xb4ea00eb in ?? () from /usr/lib/libglib-2.0.so.0
#44 0xb4ea0268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#45 0xb65a9438 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#46 0xb68cc365 in ?? () from /usr/lib/libQtGui.so.4
#47 0xb657c06a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#48 0xb657c4aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#49 0xb657e959 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#50 0xb682ad17 in QApplication::exec () from /usr/lib/libQtGui.so.4
#51 0xb7ef8b56 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#52 0x08048712 in _start ()
#0  0xb7f50430 in __kernel_vsyscall ()