Application that crashed: kmix
Version of the application: 3.5
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.2
Operating System: Linux 2.6.30-10-generic x86_64
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
There's a scrollwheel at the side of my laptop to change volume, when trying to use, I get SIGSEGV from kmix.

I was on Kubuntu 9.04 (jaunty), where it was working fine, upgraded to Kubuntu 9.10 (Karmic) and it failed.
*note: There was also an error that it could not load nVidia HDA audio, and switched to PulseAudio, just in case it matters 

 -- Backtrace:
Application: KMix (kdeinit), signal: Segmentation fault
[KCrash Handler]
#5  0x00007fbb735e7ed9 in ?? () from /usr/lib/libkdeinit4_kmix.so
#6  0x00007fbb735eabf4 in ?? () from /usr/lib/libkdeinit4_kmix.so
#7  0x00007fbb7e3e9e1c in QMetaObject::activate (sender=0x21bc120, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3113
#8  0x00007fbb7c38f7d7 in QAction::triggered (this=0x7fbb7bee2a00, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#9  0x00007fbb7c390c1f in QAction::activate (this=0x21bc120, event=<value optimized out>) at kernel/qaction.cpp:1160
#10 0x00007fbb7d00cc84 in KGlobalAccelPrivate::_k_invokeAction (this=<value optimized out>, actionId=<value optimized out>, timestamp=5860594) at /usr/include/qt4/QtGui/qaction.h:203
#11 0x00007fbb7d010fd4 in KGlobalAccel::qt_metacall (this=0x21bc8b0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff57e68870) at ./kglobalaccel.moc:70
#12 0x00007fbb7e3e9e1c in QMetaObject::activate (sender=0x21bc998, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3113
#13 0x00007fbb7d111694 in OrgKdeKGlobalAccelInterface::invokeAction (this=0x7fbb7bee2a00, _t1=<value optimized out>, _t2=5860594) at kglobalaccel_interface.moc:152
#14 0x00007fbb7d1119c3 in OrgKdeKGlobalAccelInterface::qt_metacall (this=0x21bc998, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff57e68fd0) at kglobalaccel_interface.moc:109
#15 0x00007fbb7a461af4 in QDBusConnectionPrivate::deliverCall (this=<value optimized out>, object=<value optimized out>, msg=<value optimized out>, metaTypes=@0x2190210, 
    slotIdx=<value optimized out>) at qdbusintegrator.cpp:891
#16 0x00007fbb7a468e0f in QDBusCallDeliveryEvent::placeMetaCall (this=0x0, object=0x7fbb7bcb1738) at qdbusintegrator_p.h:101
#17 0x00007fbb7e3e4139 in QObject::event (this=0x21bc998, e=0x21901c0) at kernel/qobject.cpp:1111
#18 0x00007fbb7c39562c in QApplicationPrivate::notify_helper (this=0x20df100, receiver=0x21bc998, e=0x21901c0) at kernel/qapplication.cpp:4056
#19 0x00007fbb7c39c8fe in QApplication::notify (this=0x20d65b0, receiver=0x21bc998, e=0x21901c0) at kernel/qapplication.cpp:4021
#20 0x00007fbb7cfc9c16 in KApplication::notify (this=0x20d65b0, receiver=0x21bc998, event=0x21901c0) at ../../kdeui/kernel/kapplication.cpp:302
#21 0x00007fbb7e3d4c6c in QCoreApplication::notifyInternal (this=0x20d65b0, receiver=0x21bc998, event=0x21901c0) at kernel/qcoreapplication.cpp:610
#22 0x00007fbb7e3d584a in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x203c0e0)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#23 0x00007fbb7e3fd583 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#24 0x00007fbb7b2c48fe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#25 0x00007fbb7b2c7fd8 in ?? () from /usr/lib/libglib-2.0.so.0
#26 0x00007fbb7b2c8100 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#27 0x00007fbb7e3fd1f6 in QEventDispatcherGlib::processEvents (this=0x20ea5a0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#28 0x00007fbb7c429ace in QGuiEventDispatcherGlib::processEvents (this=0x7fbb7bee2a00, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#29 0x00007fbb7e3d3572 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#30 0x00007fbb7e3d3944 in QEventLoop::exec (this=0x7fff57e698c0, flags=) at kernel/qeventloop.cpp:201
#31 0x00007fbb7e3d5af9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#32 0x00007fbb735e79c2 in kdemain () from /usr/lib/libkdeinit4_kmix.so
#33 0x0000000000406cd4 in launch (argc=5, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=40, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x208649c "laptopmatijn;1246308726;478855;4122_TIME5788585") at ../../kinit/kinit.cpp:671
#34 0x0000000000407980 in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1163
#35 0x0000000000407f1f in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1356
#36 0x0000000000408ad2 in main (argc=2, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1783

Reported using DrKonqi