Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          gcc 4.3 
OS:                Linux

With upgrading to KDE4 Beta2 KNotify crashes immediately after KDE startup and than repeatedly after launching several applications. Backtrace like below are produced, which gave the hint to the Phonon Xine backend.

RPM packages used:
libphonon4-4.1.83-6.1
phonon-4.1.83-6.1
libxine1-1.1.13-0.pm.3 (i686)
libxine1-directfb-1.1.13-0.pm.3
libxine1-sdl-1.1.13-0.pm.3
libxine1-jack-1.1.13-0.pm.3
libxine1-w32dll-1.1.13-0.pm.3
libxine1-xvmc-1.1.13-0.pm.3
libxine1-dxr3-1.1.13-0.pm.3
libxine1-syncfb-1.1.13-0.pm.3
libxine1-arts-1.1.13-0.pm.3

Sound hardware:
Intel 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller

Backtrace:
Application: KNotify (knotify4), signal SIGSEGV
[?1034h[Thread debugging using libthread_db enabled]
[New Thread 0xb691b6d0 (LWP 3007)]
[New Thread 0xaff62b90 (LWP 3019)]
[New Thread 0xb0b8fb90 (LWP 3018)]
[New Thread 0xb1602b90 (LWP 3016)]
[New Thread 0xb1e03b90 (LWP 3015)]
[New Thread 0xb27d1b90 (LWP 3014)]
[New Thread 0xb2fd2b90 (LWP 3013)]
[New Thread 0xb3815b90 (LWP 3012)]
[New Thread 0xb4016b90 (LWP 3009)]
[KCrash handler]
#6  0xb4acca5e in ?? () from /usr/lib/libxine.so.1
#7  0xb4b1f5cb in Phonon::Xine::XineThread::event ()
   from /usr/lib/kde4/phonon_xine.so
#8  0xb733eecc in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#9  0xb734531e in QApplication::notify () from /usr/lib/libQtGui.so.4
#10 0xb6f4406d in KApplication::notify () from /usr/lib/libkdeui.so.5
#11 0xb7c31bc1 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#12 0xb7c32481 in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#13 0xb7c5a7ca in QEventDispatcherUNIX::processEvents ()
   from /usr/lib/libQtCore.so.4
#14 0xb7c3033a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#15 0xb7c304fa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#16 0xb7b54be3 in QThread::exec () from /usr/lib/libQtCore.so.4
#17 0xb4b1f318 in Phonon::Xine::XineThread::run ()
   from /usr/lib/kde4/phonon_xine.so
#18 0xb7b579b7 in ?? () from /usr/lib/libQtCore.so.4
#19 0xb7afb175 in start_thread () from /lib/libpthread.so.0
#20 0xb6b53dce in clone () from /lib/libc.so.6

Thread 5 (Thread 0xb1e03b90 (LWP 3015)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7afec15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb4ad6f78 in ?? () from /usr/lib/libxine.so.1
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 4 (Thread 0xb1602b90 (LWP 3016)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7afec15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb4ae8858 in ?? () from /usr/lib/libxine.so.1
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 3 (Thread 0xb0b8fb90 (LWP 3018)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7afec15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb4ae576c in ?? () from /usr/lib/libxine.so.1
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 2 (Thread 0xaff62b90 (LWP 3019)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7afef42 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#2  0xb4ae1a7e in ?? () from /usr/lib/libxine.so.1
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 1 (Thread 0xb691b6d0 (LWP 3007)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7afef42 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#2  0xb7b5871c in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xb7b577b4 in QThread::wait () from /usr/lib/libQtCore.so.4
#4  0xb4b22733 in Phonon::Xine::XineEngine::~XineEngine ()
   from /usr/lib/kde4/phonon_xine.so
#5  0xb4b37c6e in Phonon::Xine::Backend::~Backend ()
   from /usr/lib/kde4/phonon_xine.so
#6  0xb6d5dce7 in Phonon::FactoryPrivate::~FactoryPrivate ()
   from /usr/lib/libphonon.so.4
#7  0xb6d5cd25 in Phonon::._254::destroy () from /usr/lib/libphonon.so.4
#8  0xb6d450bb in Phonon::CleanUpGlobalStatic::~CleanUpGlobalStatic ()
   from /usr/lib/libphonon.so.4
#9  0xb6ab38f1 in exit () from /lib/libc.so.6
#10 0xb7396bbb in ?? () from /usr/lib/libQtGui.so.4
#11 0xb6f43a37 in KApplication::xioErrhandler () from /usr/lib/libkdeui.so.5
#12 0xb6f43a76 in kde_xio_errhandler () from /usr/lib/libkdeui.so.5
#13 0xb79ed322 in _XIOError () from /usr/lib/libX11.so.6
#14 0xb79f5385 in ?? () from /usr/lib/libX11.so.6
#15 0xb79f5ba5 in _XEventsQueued () from /usr/lib/libX11.so.6
#16 0xb79ddacf in XEventsQueued () from /usr/lib/libX11.so.6
#17 0xb73c944d in ?? () from /usr/lib/libQtGui.so.4
#18 0xb7c3033a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#19 0xb7c304fa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#20 0xb7c326dd in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#21 0xb733ed47 in QApplication::exec () from /usr/lib/libQtGui.so.4
#22 0x0804d42d in main ()
#0  0xffffe430 in __kernel_vsyscall ()