Application that crashed: kmail
Version of the application: 1.12.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.30-2-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
Wrote a simple note a mailed it. This exact same operation worked yesterday, so I'm not sure how reproducible this is.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
The current source language is "auto; currently c".
[KCrash Handler]
#5  0x00007f85ee8a87e2 in KMail::MessageListView::Core::View::setAllGroupsExpanded (this=0x1358d30, expand=true) at ../../kmail/messagelistview/core/view.cpp:928
#6  0x00007f85ee851f78 in KMail::MessageListView::Pane::selectAll (this=<value optimized out>) at ../../kmail/messagelistview/pane.cpp:733
#7  0x00007f85ee71e330 in KMMainWidget::slotMarkAll (this=0xe13480) at ../../kmail/kmmainwidget.cpp:3380
#8  0x00007f85ee732b9d in KMMainWidget::qt_metacall (this=0xe13480, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff1015d5a0) at ./kmmainwidget.moc:450
#9  0x00007f85edd3cdf2 in QMetaObject::activate (sender=0x10ddbd0, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x7fff1015d5a0) at kernel/qobject.cpp:3112
#10 0x00007f85ed19b147 in QAction::triggered (this=0x1358d30, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#11 0x00007f85ed19c5c0 in QAction::activate (this=0x10ddbd0, event=<value optimized out>) at kernel/qaction.cpp:1167
#12 0x00007f85ed19f07f in QAction::event (this=0x1358d30, e=<value optimized out>) at kernel/qaction.cpp:1086
#13 0x00007f85ef30d023 in KAction::event (this=0x1358d30, event=0x7fff1015db30) at ../../kdeui/actions/kaction.cpp:88
#14 0x00007f85ed1a101d in QApplicationPrivate::notify_helper (this=0xb5d160, receiver=0x10ddbd0, e=0x7fff1015db30) at kernel/qapplication.cpp:4065
#15 0x00007f85ed1a907a in QApplication::notify (this=0x7fff10160310, receiver=0x10ddbd0, e=0x7fff1015db30) at kernel/qapplication.cpp:4030
#16 0x00007f85ef3df0db in KApplication::notify (this=0x7fff10160310, receiver=0x10ddbd0, event=0x7fff1015db30) at ../../kdeui/kernel/kapplication.cpp:302
#17 0x00007f85edd27c9c in QCoreApplication::notifyInternal (this=0x7fff10160310, receiver=0x10ddbd0, event=0x7fff1015db30) at kernel/qcoreapplication.cpp:610
#18 0x00007f85ed1d60ed in QCoreApplication::sendEvent (this=<value optimized out>, e=0x7fff1015e030) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#19 QShortcutMap::dispatchEvent (this=<value optimized out>, e=0x7fff1015e030) at kernel/qshortcutmap.cpp:884
#20 0x00007f85ed1d7e6c in QShortcutMap::tryShortcutEvent (this=0xb5d278, o=<value optimized out>, e=0x7fff1015e030) at kernel/qshortcutmap.cpp:369
#21 0x00007f85ed1aa059 in QApplication::notify (this=0x7fff10160310, receiver=0x1380110, e=0x7fff1015e030) at kernel/qapplication.cpp:3647
#22 0x00007f85ef3df0db in KApplication::notify (this=0x7fff10160310, receiver=0x1380110, event=0x7fff1015e030) at ../../kdeui/kernel/kapplication.cpp:302
#23 0x00007f85edd27c9c in QCoreApplication::notifyInternal (this=0x7fff10160310, receiver=0x1380110, event=0x7fff1015e030) at kernel/qcoreapplication.cpp:610
#24 0x00007f85ed234ab4 in QKeyMapper::sendKeyEvent (keyWidget=0x1380110, grab=<value optimized out>, type=QEvent::KeyPress, code=65, modifiers=..., text=..., autorepeat=false, count=1, 
    nativeScanCode=38, nativeVirtualKey=97, nativeModifiers=20) at kernel/qkeymapper_x11.cpp:1861
#25 0x00007f85ed236d89 in QKeyMapperPrivate::translateKeyEvent (this=0xbfe100, keyWidget=0x1380110, event=0x7fff1015fe30, grab=true) at kernel/qkeymapper_x11.cpp:1831
#26 0x00007f85ed20fd06 in QApplication::x11ProcessEvent (this=0x7fff10160310, event=0x7fff1015fe30) at kernel/qapplication_x11.cpp:3445
#27 0x00007f85ed23876c in x11EventSourceDispatch (s=0xb5f9a0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#28 0x00007f85e50c012a in g_main_dispatch (context=0xb5e2b0) at /tmp/buildd/glib2.0-2.22.2/glib/gmain.c:1960
#29 IA__g_main_context_dispatch (context=0xb5e2b0) at /tmp/buildd/glib2.0-2.22.2/glib/gmain.c:2513
#30 0x00007f85e50c3988 in g_main_context_iterate (context=0xb5e2b0, block=1, dispatch=1, self=<value optimized out>) at /tmp/buildd/glib2.0-2.22.2/glib/gmain.c:2591
#31 0x00007f85e50c3b3c in IA__g_main_context_iteration (context=0xb5e2b0, may_block=1) at /tmp/buildd/glib2.0-2.22.2/glib/gmain.c:2654
#32 0x00007f85edd5039c in QEventDispatcherGlib::processEvents (this=0xb29170, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#33 0x00007f85ed237f1f in QGuiEventDispatcherGlib::processEvents (this=0x1358d30, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007f85edd26562 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#35 0x00007f85edd26934 in QEventLoop::exec (this=0x7fff10160160, flags=...) at kernel/qeventloop.cpp:201
#36 0x00007f85edd28ba4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0x0000000000402fab in main (argc=<value optimized out>, argv=<value optimized out>) at ../../kmail/main.cpp:146

Reported using DrKonqi