Application that crashed: kmail
Version of the application: 1.12.2
KDE Version: 4.3.1 (KDE 4.3.1) "release 163"
Qt Version: 4.5.2
Operating System: Linux 2.6.25.20-0.5-default x86_64

What I was doing when the application crashed:
Devs,

    This one is strange. I have no idea what is causing kmail to grab virtually all of the cpu and hang, but that is exactly what is happening.  This is a new problem with this latest release of kmail. The last few releases didn't do this. What happens is all of a sudden kmail just become non-responsive and grab 90+ percent of the cpu and must be closed with "force quit". According to the about information, I have:

KMail
Version 1.12.2
Using KDE 4.3.1 (KDE 4.3.1) "release 163"

    I'll upload a screenshot and the message that it hung on in a bit.

 -- Backtrace:
Application: KMail (kmail), signal: Aborted
[KCrash Handler]
#13 0x0000000000000020 in ?? ()
#14 0x00007fad5e5a0a26 in ?? () from /usr/lib64/libkio.so.5
#15 0x00007fad5e59c843 in ?? () from /usr/lib64/libkio.so.5
#16 0x00007fad5bd2626d in exit () from /lib64/libc.so.6
#17 0x00007fad5c9c1378 in qt_xio_errhandler () at kernel/qapplication_x11.cpp:707
#18 0x00007fad61695c38 in KApplication::xioErrhandler(_XDisplay*) () from /usr/lib64/libkdeui.so.5
#19 0x00007fad5b5d5ee4 in _XIOError () from /usr/lib64/libX11.so.6
#20 0x00007fad5b5dcca0 in _XGetXCBBuffer () from /usr/lib64/libX11.so.6
#21 0x00007fad5b5ddb62 in _XReply () from /usr/lib64/libX11.so.6
#22 0x00007fad5b5cb16f in XQueryPointer () from /usr/lib64/libX11.so.6
#23 0x00007fad5c9df46d in QCursor::pos () at kernel/qcursor_x11.cpp:156
#24 0x00007fad5c96bb3d in QApplicationPrivate::sendSyntheticEnterLeave (this=<value optimized out>, widget=0xecfce0) at kernel/qapplication.cpp:2986
#25 0x00007fad5c9ba13a in QWidget::setVisible (this=0xecfce0, visible=<value optimized out>) at kernel/qwidget.cpp:6978
#26 0x00007fad5cd9ca1e in QAbstractScrollAreaPrivate::layoutChildren (this=0xecea30) at widgets/qabstractscrollarea.cpp:452
#27 0x00007fad5cd9d32d in QAbstractScrollArea::qt_metacall (this=0xece9d0, _c=InvokeMetaMethod, _id=24325408, _a=0x3096b70) at .moc/release-shared/moc_qabstractscrollarea.cpp:80
#28 0x00007fad5cf6f7b5 in QScrollArea::qt_metacall (this=0x172f240, _c=1541488400, _id=33, _a=0x0) at .moc/release-shared/moc_qscrollarea.cpp:63
#29 0x00007fad59570c05 in KHTMLView::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkhtml.so.5
#30 0x00007fad5dc594d8 in QObject::event (this=0xece9d0, e=0x3096bd0) at kernel/qobject.cpp:1111
#31 0x00007fad5c9b45ad in QWidget::event (this=0xece9d0, event=0x3096bd0) at kernel/qwidget.cpp:7946
#32 0x00007fad5cd0b4bb in QFrame::event (this=0xece9d0, e=0x3096bd0) at widgets/qframe.cpp:559
#33 0x00007fad5cd9cf09 in QAbstractScrollArea::event (this=0xece9d0, e=0x3096bd0) at widgets/qabstractscrollarea.cpp:918
#34 0x00007fad59572b41 in KHTMLView::event(QEvent*) () from /usr/lib64/libkhtml.so.5
#35 0x00007fad5c963a9d in QApplicationPrivate::notify_helper (this=0x64a6b0, receiver=0xece9d0, e=0x3096bd0) at kernel/qapplication.cpp:4056
#36 0x00007fad5c96bd1a in QApplication::notify (this=0x7fff69caa230, receiver=0xece9d0, e=0x3096bd0) at kernel/qapplication.cpp:4021
#37 0x00007fad6169622b in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#38 0x00007fad5dc494fc in QCoreApplication::notifyInternal (this=0x7fff69caa230, receiver=0xece9d0, event=0x3096bd0) at kernel/qcoreapplication.cpp:610
#39 0x00007fad5dc4a18a in sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#40 QCoreApplicationPrivate::sendPostedEvents (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.cpp:1247
#41 0x00007fad5dc72d53 in sendPostedEvents () at kernel/qcoreapplication.h:218
#42 postEventSourceDispatch () at kernel/qeventdispatcher_glib.cpp:210
#43 0x00007fad531ec95a in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#44 0x00007fad531f0060 in ?? () from /usr/lib64/libglib-2.0.so.0
#45 0x00007fad531f01fc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#46 0x00007fad5dc729df in QEventDispatcherGlib::processEvents (this=0x60e0b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#47 0x00007fad5c9fb41f in QGuiEventDispatcherGlib::processEvents (this=0x172f240, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#48 0x00007fad5dc47d72 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#49 0x00007fad5dc48144 in QEventLoop::exec (this=0x7fff69caa080, flags=...) at kernel/qeventloop.cpp:201
#50 0x00007fad5dc4a454 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#51 0x00000000004030fb in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdepim-4.3.1/kmail/main.cpp:146

Reported using DrKonqi