Version:           4.00.63 (using Devel)
Installed from:    Compiled sources
Compiler:          gcc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2) Stock KUbuntu compiler
OS:                Linux

When surfing with Firefox 2, it hang up. I don't know why but this is off topic. 
When trying to close it I got this crash :



Application: KWin (kwin), signal SIGSEGV
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1243912480 (LWP 15150)]
[New Thread -1309889648 (LWP 16917)]
[KCrash handler]
#6  0xb7a4bf47 in QProcess::setProcessState (this=0x85a3638, 
    state=QProcess::NotRunning) at io/qprocess.cpp:1295
#7  0xb7a4dbf5 in QProcessPrivate::cleanup (this=0x83e43e8)
    at io/qprocess.cpp:424
#8  0xb7a4e244 in QProcessPrivate::_q_processDied (this=0x83e43e8)
    at io/qprocess.cpp:677
#9  0xb7a87d20 in QProcessPrivate::waitForFinished (this=0x83e43e8, 
    msecs=30000) at io/qprocess_unix.cpp:1172
#10 0xb7a4cfb9 in QProcess::waitForFinished (this=0x846d958, msecs=30000)
    at io/qprocess.cpp:1284
#11 0xb7a4de8f in ~QProcess (this=0x846d958) at io/qprocess.cpp:767
#12 0xb7f50ce8 in KWin::Client::gotPing (this=0x8303718, timestamp=1732653204)
    at /home/valentin/kde/src/4/KDE/kdebase/workspace/kwin/client.cpp:1084
#13 0xb7f735da in KWin::RootInfo::gotPing (this=0x81ff770, w=14680252, 
    timestamp=1732653204)
    at /home/valentin/kde/src/4/KDE/kdebase/workspace/kwin/events.cpp:204
#14 0xb6f207d2 in NETRootInfo::event (this=0x81ff770, event=0xbf8374bc, 
    properties=0xbf836fcc, properties_size=5)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/windowmanagement/netwm.cpp:1950
#15 0xb7f7288d in KWin::Workspace::workspaceEvent (this=0x80e07a0, 
    e=0xbf8374bc)
    at /home/valentin/kde/src/4/KDE/kdebase/workspace/kwin/events.cpp:233
#16 0xb7f60f6b in KWin::Application::x11EventFilter (this=0xbf837760, 
    e=0xbf8374bc)
    at /home/valentin/kde/src/4/KDE/kdebase/workspace/kwin/main.cpp:359
#17 0xb716c8c5 in qt_x11EventFilter (ev=0xbf8374bc)
    at kernel/qapplication_x11.cpp:371
#18 0xb717894d in QApplication::x11ProcessEvent (this=0xbf837760, 
    event=0xbf8374bc) at kernel/qapplication_x11.cpp:2976
#19 0xb71a8aed in x11EventSourceDispatch (s=0x805d258, callback=0, 
    user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:148
#20 0xb67d811c in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0xb67db55f in ?? () from /usr/lib/libglib-2.0.so.0
#22 0x0805c698 in ?? ()
#23 0x00000000 in ?? ()
#0  0xffffe410 in __kernel_vsyscall ()


Firefox window is still there and now, in Konqueror, I'm not seeing what I'm typing, as my session seems disturbed. I'll finish this and then restart my session.