Application that crashed: konqueror
Version of the application: 4.3.3 (KDE 4.3.3)
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.3
Operating System: Linux 2.6.31-ARCH i686

What I was doing when the application crashed:
I opened a folder in a new tab in konqueror and it crashed. for some seconds (4 at least) the plasma panel dissapeared and after reappeared. Kwin also crashed (I will report that by opening another bug report. I will put the url in a comment here). 

 -- Backtrace:
Application: Konqueror (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5538700 (LWP 30532))]

Thread 3 (Thread 0xb1ed8b70 (LWP 8608)):
#0  0xb7717424 in __kernel_vsyscall ()
#1  0xb74b7192 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7514fef in QWaitConditionPrivate::wait (this=0xa3d5e48, mutex=0xa3d5e44, time=30000) at thread/qwaitcondition_unix.cpp:85
#3  QWaitCondition::wait (this=0xa3d5e48, mutex=0xa3d5e44, time=30000) at thread/qwaitcondition_unix.cpp:159
#4  0xb750a83e in QThreadPoolThread::run (this=0xa3b4708) at concurrent/qthreadpool.cpp:140
#5  0xb7514052 in QThreadPrivate::start (arg=0xa3b4708) at thread/qthread_unix.cpp:188
#6  0xb74b28ac in start_thread () from /lib/libpthread.so.0
#7  0xb5f4ba9e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xb16d7b70 (LWP 8609)):
#0  0xb7717424 in __kernel_vsyscall ()
#1  0xb74b7192 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7514fef in QWaitConditionPrivate::wait (this=0xa3d5e48, mutex=0xa3d5e44, time=30000) at thread/qwaitcondition_unix.cpp:85
#3  QWaitCondition::wait (this=0xa3d5e48, mutex=0xa3d5e44, time=30000) at thread/qwaitcondition_unix.cpp:159
#4  0xb750a83e in QThreadPoolThread::run (this=0xafc3088) at concurrent/qthreadpool.cpp:140
#5  0xb7514052 in QThreadPrivate::start (arg=0xafc3088) at thread/qthread_unix.cpp:188
#6  0xb74b28ac in start_thread () from /lib/libpthread.so.0
#7  0xb5f4ba9e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5538700 (LWP 30532)):
[KCrash Handler]
#6  QBasicAtomicInt::ref (this=0xbf9a2580, other=...) at ../../include/QtCore/../../src/corelib/arch/qatomic_i386.h:120
#7  QUrl (this=0xbf9a2580, other=...) at io/qurl.cpp:3938
#8  0xb73009b9 in KUrl (this=0xbf9a2580, _u=...) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kdecore/io/kurl.cpp:468
#9  0xb6f10779 in KDirListerCache::findByUrl (this=0xa2c6308, lister=0x4, _u=...) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kio/kio/kdirlister.cpp:723
#10 0xb6f10ace in KDirLister::findByUrl (this=0x4, _url=...) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kio/kio/kdirlister.cpp:2049
#11 0xb0555102 in KHTMLPart::htmlDocument (this=0xa2f9480) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/khtml/khtml_part.cpp:1001
#12 0xb0ac0a1b in SearchBarPlugin::HTMLDocLoaded() () from /usr/lib/kde4/searchbarplugin.so
#13 0xb0ac67a3 in SearchBarPlugin::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/kde4/searchbarplugin.so
#14 0xb7617fdc in QMetaObject::activate (sender=0x12c708e8, from_signal_index=<value optimized out>, to_signal_index=8, argv=0xfcc9c381) at kernel/qobject.cpp:3112
#15 0xb7618c12 in QMetaObject::activate (sender=0x12c708e8, m=0xb7231030, local_signal_index=1, argv=0x0) at kernel/qobject.cpp:3186
#16 0xb72093a7 in KParts::ReadOnlyPart::completed (this=0x12c708e8) at /home/phil/kdemod/core/kdelibs/src/build/kparts/part.moc:207
#17 0xb0540485 in KHTMLView::timerEvent (this=0xd8a1de8, e=0xbf9a3020) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/khtml/khtmlview.cpp:4224
#18 0xb761218f in QObject::event (this=0xd8a1de8, e=0xbf9a3020) at kernel/qobject.cpp:1074
#19 0xb622dac6 in QWidget::event (this=0xd8a1de8, event=0xbf9a3020) at kernel/qwidget.cpp:7951
#20 0xb65d4253 in QFrame::event (this=0xd8a1de8, e=0xbf9a3020) at widgets/qframe.cpp:559
#21 0xb66724ca in QAbstractScrollArea::event (this=0xd8a1de8, e=0xbf9a3020) at widgets/qabstractscrollarea.cpp:918
#22 0xb66774bd in QScrollArea::event (this=0xd8a1de8, e=0xbf9a3020) at widgets/qscrollarea.cpp:314
#23 0xb054272c in KHTMLView::event (this=0xd8a1de8, e=0xbf9a3020) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/khtml/khtmlview.cpp:546
#24 0xb61d9924 in QApplicationPrivate::notify_helper (this=0x9fa4818, receiver=0xd8a1de8, e=0xbf9a3020) at kernel/qapplication.cpp:4065
#25 0xb61e0f5a in QApplication::notify (this=0xbf9a3424, receiver=0xd8a1de8, e=0xbf9a3020) at kernel/qapplication.cpp:4030
#26 0xb6c1c5ca in KApplication::notify (this=0xbf9a3424, receiver=0xd8a1de8, event=0xbf9a3020) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kdeui/kernel/kapplication.cpp:302
#27 0xb76025bb in QCoreApplication::notifyInternal (this=0xbf9a3424, receiver=0xd8a1de8, event=0xbf9a3020) at kernel/qcoreapplication.cpp:610
#28 0xb762fefe in QCoreApplication::sendEvent (this=0x9fa7934) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#29 QTimerInfoList::activateTimers (this=0x9fa7934) at kernel/qeventdispatcher_unix.cpp:580
#30 0xb762d007 in timerSourceDispatch (source=0x9fa74a0) at kernel/qeventdispatcher_glib.cpp:184
#31 idleTimerSourceDispatch (source=0x9fa74a0) at kernel/qeventdispatcher_glib.cpp:231
#32 0xb5de0328 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#33 0xb5de3ba0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#34 0xb5de3cd3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#35 0xb762cd25 in QEventDispatcherGlib::processEvents (this=0x9f07338, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#36 0xb6277705 in QGuiEventDispatcherGlib::processEvents (this=0x9f07338, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#37 0xb7600ba9 in QEventLoop::processEvents (this=0xbf9a32e4, flags=) at kernel/qeventloop.cpp:149
#38 0xb7600ffa in QEventLoop::exec (this=0xbf9a32e4, flags=...) at kernel/qeventloop.cpp:201
#39 0xb760346f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#40 0xb61d97a7 in QApplication::exec () at kernel/qapplication.cpp:3525
#41 0xb3f75f0f in kdemain (argc=4, argv=0x9f5e218) at /home/phil/kdemod/core/kdebase/src/kdebase-4.3.3/apps/konqueror/src/konqmain.cpp:271
#42 0x0804de42 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x9f516fc "/home/zuargo", envc=47, envs=0x9f5170d "GREP_COLOR=1;33", 
    reset_env=true, tty=0x0, avoid_loops=false, startup_id_str=0x9f51d53 "zuargo-archlinux;1259147233;131488;7243_TIME684857") at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kinit/kinit.cpp:677
#43 0x0804e9ad in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kinit/kinit.cpp:1169
#44 0x0804ee03 in handle_requests (waitForPid=<value optimized out>) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kinit/kinit.cpp:1353
#45 0x0804f63f in main (argc=2, argv=0xbf9a3f34, envp=0xbf9a3f40) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kinit/kinit.cpp:1793

Reported using DrKonqi