Version:            (using KDE 4.1.3)
OS:                Linux
Installed from:    Ubuntu Packages

I often start a secure network session via the SSH functionality in KDM.  I connect to my main computer from my laptop.

Using the laptop's volume-control keys sometimes causes KMix to crash.

It doesn't do it all the time.  As far as I can tell, it happens if someone is also logged on to the remote computer directly, with a different account from the one you are using.  Otherwise, the volume is changed correctly. (Of course, it only affects the volume on the remote computer, as SSH only tunnels the graphical output of apps, not their audio.)

Here's the backtrace:

Application: KMix (kmix), signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0x7faceff8a6f0 (LWP 11696)]
[KCrash handler]
#5  Mixer::find (this=0x0, mixdeviceID=@0x28)
    at /build/buildd/kdemultimedia-4.1.3/kmix/mixer.cpp:409
#6  0x00007facefb60cbb in KMixWindow::slotDecreaseVolume (this=0x192cf40)
    at /build/buildd/kdemultimedia-4.1.3/kmix/kmix.cpp:612
#7  0x00007facefb63732 in KMixWindow::qt_metacall (this=0x192cf40, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7ffff7fbc450)
    at /build/buildd/kdemultimedia-4.1.3/obj-x86_64-linux-gnu/kmix/kmix.moc:108
#8  0x00007facee5d9134 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#9  0x00007faced629f57 in QAction::triggered () from /usr/lib/libQtGui.so.4
#10 0x00007faced62a720 in QAction::activate () from /usr/lib/libQtGui.so.4
#11 0x00007facef43c209 in KGlobalAccelPrivate::_k_invokeAction (
    this=0x1a15d70, actionId=@0x1a5b680, timestamp=10615967)
    at /usr/include/qt4/QtGui/qaction.h:195
#12 0x00007facef43f61e in KGlobalAccel::qt_metacall (this=0x1a14780, 
    _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7ffff7fbc660)
    at /build/buildd/kde4libs-4.1.3/obj-x86_64-linux-gnu/kdeui/kglobalaccel.moc:69
#13 0x00007facee5d9134 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#14 0x00007facef43bb54 in OrgKdeKdedGlobalAccelInterface::invokeAction (
    this=0x0, _t1=<value optimized out>, _t2=10615967)
    at /build/buildd/kde4libs-4.1.3/obj-x86_64-linux-gnu/kdeui/kdedglobalaccel_interface.moc:117
#15 0x00007facef43de3b in OrgKdeKdedGlobalAccelInterface::qt_metacall (
    this=0x1a15d98, _c=QMetaObject::InvokeMetaMethod, 
    _id=<value optimized out>, _a=0x7ffff7fbca40)
    at /build/buildd/kde4libs-4.1.3/obj-x86_64-linux-gnu/kdeui/kdedglobalaccel_interface.moc:91
#16 0x00007facee224ea3 in ?? () from /usr/lib/libQtDBus.so.4
#17 0x00007facee22beef in ?? () from /usr/lib/libQtDBus.so.4
#18 0x00007facee5d3da5 in QObject::event () from /usr/lib/libQtCore.so.4
#19 0x00007faced62fc3d in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#20 0x00007faced6379ba in QApplication::notify () from /usr/lib/libQtGui.so.4
#21 0x00007facef3f8fcb in KApplication::notify (this=0x19252c0, 
    receiver=0x1a15d98, event=0x19a7ee0)
    at /build/buildd/kde4libs-4.1.3/kdeui/kernel/kapplication.cpp:311
#22 0x00007facee5c4d61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#23 0x00007facee5c59fa in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#24 0x00007facee5ed4d3 in ?? () from /usr/lib/libQtCore.so.4
#25 0x00007faceac8bd3b in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#26 0x00007faceac8f50d in ?? () from /usr/lib/libglib-2.0.so.0
#27 0x00007faceac8f6cb in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#28 0x00007facee5ed15f in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#29 0x00007faced6c1a6f in ?? () from /usr/lib/libQtGui.so.4
#30 0x00007facee5c3682 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#31 0x00007facee5c380d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#32 0x00007facee5c5cbd in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#33 0x00007facefb6052a in kdemain (argc=1, argv=0x7ffff7fbd908)
    at /build/buildd/kdemultimedia-4.1.3/kmix/main.cpp:69
#34 0x00007facef7f0466 in __libc_start_main () from /lib/libc.so.6
#35 0x0000000000400659 in _start ()
#0  0x00007facef87a5f0 in __nanosleep_nocancel () from /lib/libc.so.6