Unplugging mobile network devices causes plasma to crash

[Martin]

Binary package hint: plasma-widget-network-manager

When I've got the network-manager widget enabled, plasma crashes very reliably when I plug in or unplug the USB connection to my 3G phone and those tty-interfaces (which I'm not using) are added or removed, which usually comes with a couple of pop-up notifications from the widget.

This behavior only started a couple of days ago, I can't pinpoint what change or update might have triggered it.

Crash handler says the backtrace is useless, but since it wasn't empty I thought I'd attach it anyway:

--------------------------------------------------------------------------------------

This backtrace appears to be of no use.
This is probably because your packages are built in a way which prevents creation of proper backtraces, or the stack frame was seriously corrupted in the crash.

[...]

[Thread debugging using libthread_db enabled]
[New Thread 0x7fdddc9ac760 (LWP 14763)]
[New Thread 0x7fddbcee0950 (LWP 14766)]
[New Thread 0x7fddbd8e7950 (LWP 14764)]

[...]

0x00007fddd73ebd21 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 14763)]

Thread 3 (Thread 0x7fddbd8e7950 (LWP 14764)):
#0 0x00007fddd4aa32e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1 0x00007fddd7ecd939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2 0x00007fdddb6894cc in ?? () from /usr/lib/libQtNetwork.so.4
#3 0x00007fddd7ecc952 in ?? () from /usr/lib/libQtCore.so.4
#4 0x00007fddd4a9f3ba in start_thread () from /lib/libpthread.so.0
#5 0x00007fddd7429fcd in clone () from /lib/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fddbcee0950 (LWP 14766)):
#0 0x00007fddd4aa32e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1 0x00007fddd7ecd939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2 0x00007fddbe86cd4e in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#3 0x00007fddd7ecc952 in ?? () from /usr/lib/libQtCore.so.4
#4 0x00007fddd4a9f3ba in start_thread () from /lib/libpthread.so.0
#5 0x00007fddd7429fcd in clone () from /lib/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fdddc9ac760 (LWP 14763)):
#0 0x00007fddd73ebd21 in nanosleep () from /lib/libc.so.6
#1 0x00007fddd73ebb47 in sleep () from /lib/libc.so.6
#2 0x00007fdddae1cb1f in ?? () from /usr/lib/libkdeui.so.5
#3 0x00007fdddae1d42a in KCrash::defaultCrashHandler () from /usr/lib/libkdeui.so.5
#4 <signal handler called>
#5 0x00007fddd73c83b7 in memcpy () from /lib/libc.so.6
#6 0x00007fddd7ef082c in QListData::detach2 () from /usr/lib/libQtCore.so.4
#7 0x00007fddbf0eb6f3 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#8 0x00007fddbf0ea58f in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#9 0x00007fddbf0fb9cc in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#10 0x00007fddbf0e8700 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#11 0x00007fddd7fcb1f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#12 0x00007fddbf0ec4e2 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#13 0x00007fddbf0e8613 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#14 0x00007fddbf0e86a5 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#15 0x00007fddd7fcb1f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0x00007fddbeec7817 in NetworkManagerSettings::connectionRemoved () from /usr/lib/libknmdbus.so.4
#17 0x00007fddbeec8ca0 in NetworkManagerSettings::onConnectionRemoved () from /usr/lib/libknmdbus.so.4
#18 0x00007fddbeec93e0 in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#19 0x00007fddd7fcb1f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#20 0x00007fddbeec6580 in OrgFreedesktopNetworkManagerSettingsConnectionInterface::qt_metacall () from /usr/lib/libknmdbus.so.4
#21 0x00007fddd82d3f83 in ?? () from /usr/lib/libQtDBus.so.4
#22 0x00007fddd82dbd0f in ?? () from /usr/lib/libQtDBus.so.4
#23 0x00007fddd7fc5848 in QObject::event () from /usr/lib/libQtCore.so.4
#24 0x00007fddd86fa78d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#25 0x00007fddd870297a in QApplication::notify () from /usr/lib/libQtGui.so.4
#26 0x00007fdddadb726b in KApplication::notify () from /usr/lib/libkdeui.so.5
#27 0x00007fddd7fb575c in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#28 0x00007fddd7fb63ca in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#29 0x00007fddd7fdf1e3 in ?? () from /usr/lib/libQtCore.so.4
#30 0x00007fddd2e6f20a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0x00007fddd2e728e0 in ?? () from /usr/lib/libglib-2.0.so.0
#32 0x00007fddd2e72a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0x00007fddd7fdee6f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#34 0x00007fddd8792bef in ?? () from /usr/lib/libQtGui.so.4
#35 0x00007fddd7fb4002 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#36 0x00007fddd7fb43cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#37 0x00007fddd7fb6694 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#38 0x00007fdddc7169bb in kdemain () from /usr/lib/libkdeinit4_plasma.so
#39 0x00007fddd73625a6 in __libc_start_main () from /lib/libc.so.6
#40 0x00000000004007c9 in _start ()
#0 0x00007fddd73ebd21 in nanosleep () from /lib/libc.so.6

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
NonfreeKernelModules: fglrx
Package: plasma-widget-network-manager 0.0+svn966653-0ubuntu0.1
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: plasma-widget-network-manager
Uname: Linux 2.6.28-12-generic x86_64

[GunnerGuyven (gunnerguyven)]

This happens for me as well. The widget crashes and takes plasma with it. I'm adding a virtual LAN with hamachi. When this new wired LAN is added OR removed, the widget goes down in flames.

If I disable the widget then plasma survives (so for usability sake, I have to keep this widget off if I plan to use hamachi).

[Chris Samuel (chris-csamuel)]

This is KDE bug 192790 (RESOLVED) - https://bugs.kde.org/show_bug.cgi?id=192790

This is apparently fixed in commit 970021, but the plasma-widget-network-manager is only from commit 966653.

The Kubuntu package needs updating by the packagers.

[VestniK (vestnik)]

It looks like I'm experiencing the same problem. Plasma always crashes when I creating new tap interface with the command like sudo tunctl -u $USER -t vbox0

[Jonathan Thomas (echidnaman)]

Crash resolved in Karmic.