Application: kmail (1.13.7)
KDE Platform Version: 4.8.3 (4.8.3)
Qt Version: 4.8.2
Operating System: Linux 3.2.0-2-amd64 x86_64
Distribution: Debian GNU/Linux testing (wheezy)

-- Information about the crash:
- What I was doing when the application crashed:

I just started KMail and entered valid passwords for two IMAP mailboxes, one of them is from gmail. 
KMail has previously worked well here, so apparently the contents of the mailbox does matter, I have used the web interface to move some messages while KMail was not running.

The crash can be reproduced every time.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  KMail::FolderView::slotFolderExpanded (this=<optimized out>, item=0x14b49a0) at ../../kmail/folderview.cpp:2471
#7  0x00007fd9fbfbc5cf in QMetaObject::activate (sender=0xca06b0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fffa6c85970) at kernel/qobject.cpp:3547
#8  0x00007fd9fca57ed2 in QTreeWidget::itemExpanded (this=<optimized out>, _t1=0x14b49a0) at .moc/release-shared/moc_qtreewidget.cpp:256
#9  0x00007fd9fbfbc5cf in QMetaObject::activate (sender=0xca06b0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fffa6c85ab0) at kernel/qobject.cpp:3547
#10 0x00007fd9fca20e32 in QTreeView::expanded (this=this@entry=0xca06b0, _t1=...) at .moc/release-shared/moc_qtreeview.cpp:215
#11 0x00007fd9fca2bd9c in QTreeViewPrivate::expand (this=this@entry=0xca0770, item=25, emitSignal=emitSignal@entry=true) at itemviews/qtreeview.cpp:2921
#12 0x00007fd9fca2d3eb in QTreeView::expand (this=0xca06b0, index=...) at itemviews/qtreeview.cpp:759
#13 0x00007fd9fca57332 in QTreeWidget::setItemExpanded (this=0xca06b0, item=0x14b49a0, expand=true) at itemviews/qtreewidget.cpp:3144
#14 0x00007fd9fd11df77 in setExpanded (aexpand=true, this=0x14b49a0) at /usr/include/qt4/QtGui/qtreewidget.h:409
#15 KMail::FolderView::restoreItemStates (this=this@entry=0xca06b0) at ../../kmail/folderview.cpp:389
#16 0x00007fd9fd11e937 in KMail::FolderView::reload (this=0xca06b0, openFoldersForUpdate=false) at ../../kmail/folderview.cpp:671
#17 0x00007fd9fd31b582 in KMMainWidget::readConfig (this=this@entry=0x1268430) at ../../kmail/kmmainwidget.cpp:602
#18 0x00007fd9fd3272ac in KMMainWidget::KMMainWidget (this=0x1268430, parent=<optimized out>, aGUIClient=0x1179730, actionCollection=<optimized out>, config=...) at ../../kmail/kmmainwidget.cpp:241
#19 0x00007fd9fd0cb3b4 in KMMainWin::KMMainWin (this=0x11796d0, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../kmail/kmmainwin.cpp:41
#20 0x00007fd9fd263957 in KMKernel::openReader (this=0x7fffa6c87a20, onlyCheck=onlyCheck@entry=false) at ../../kmail/kmkernel.cpp:422
#21 0x00007fd9fd263b50 in KMKernel::action (this=this@entry=0x7fffa6c87a20, mailto=mailto@entry=false, check=check@entry=false, to=..., cc=..., bcc=..., subj=..., body=..., messageFile=..., attachURLs=..., customHeaders=...) at ../../kmail/kmkernel.cpp:1939
#22 0x00007fd9fd265758 in KMKernel::handleCommandLine (this=0x7fffa6c87a20, noArgsOpensReader=true) at ../../kmail/kmkernel.cpp:368
#23 0x00000000004035fa in KMailApplication::newInstance (this=0x7fffa6c879f0) at ../../kmail/main.cpp:87
#24 0x00007fd9fe13bed2 in KUniqueApplicationAdaptor::newInstance (this=0xe020d0, asn_id=..., args=...) at ../../kdeui/kernel/kuniqueapplication.cpp:442
#25 0x00007fd9fe13bf54 in qt_static_metacall (_a=0x7fffa6c86a60, _id=<optimized out>, _o=<optimized out>, _c=<optimized out>) at ./kuniqueapplication_p.moc:58
#26 KUniqueApplicationAdaptor::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=0x7fffa6c86a60) at ./kuniqueapplication_p.moc:52
#27 0x00007fd9fe13c08b in KUniqueApplicationAdaptor::qt_metacall (this=0xe020d0, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fffa6c86a60) at ./kuniqueapplication_p.moc:102
#28 0x00007fd9f9d37c13 in QDBusConnectionPrivate::deliverCall (this=this@entry=0xad7d40, object=object@entry=0xe020d0, msg=..., metaTypes=..., slotIdx=4) at qdbusintegrator.cpp:947
#29 0x00007fd9f9d38c46 in QDBusConnectionPrivate::activateCall (this=this@entry=0xad7d40, object=0xe020d0, flags=flags@entry=337, msg=...) at qdbusintegrator.cpp:850
#30 0x00007fd9f9d39686 in QDBusConnectionPrivate::activateObject (this=0xad7d40, node=..., msg=..., pathStartPos=<optimized out>) at qdbusintegrator.cpp:1423
#31 0x00007fd9f9d3977b in QDBusActivateObjectEvent::placeMetaCall (this=0x116b930) at qdbusintegrator.cpp:1537
#32 0x00007fd9fbfbbaae in QObject::event (this=0x7fffa6c879f0, e=<optimized out>) at kernel/qobject.cpp:1195
#33 0x00007fd9fc4de814 in QApplication::event (this=0x7fffa6c879f0, e=0x116b930) at kernel/qapplication.cpp:2538
#34 0x00007fd9fc4dc70c in QApplicationPrivate::notify_helper (this=this@entry=0xb41f30, receiver=receiver@entry=0x7fffa6c879f0, e=e@entry=0x116b930) at kernel/qapplication.cpp:4556
#35 0x00007fd9fc4e0b8a in QApplication::notify (this=0x7fffa6c879f0, receiver=0x7fffa6c879f0, e=0x116b930) at kernel/qapplication.cpp:4417
#36 0x00007fd9fe135c16 in KApplication::notify (this=0x7fffa6c879f0, receiver=0x7fffa6c879f0, event=0x116b930) at ../../kdeui/kernel/kapplication.cpp:311
#37 0x00007fd9fbfa6bde in QCoreApplication::notifyInternal (this=0x7fffa6c879f0, receiver=receiver@entry=0x7fffa6c879f0, event=event@entry=0x116b930) at kernel/qcoreapplication.cpp:915
#38 0x00007fd9fbfaaa61 in sendEvent (event=0x116b930, receiver=0x7fffa6c879f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#39 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xa85220) at kernel/qcoreapplication.cpp:1539
#40 0x00007fd9fbfd5153 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#41 postEventSourceDispatch (s=0xb1f270) at kernel/qeventdispatcher_glib.cpp:279
#42 0x00007fd9f336d205 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007fd9f336d538 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007fd9f336d5f4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#45 0x00007fd9fbfd52e6 in QEventDispatcherGlib::processEvents (this=0xa86b00, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#46 0x00007fd9fc57d96e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#47 0x00007fd9fbfa592f in QEventLoop::processEvents (this=this@entry=0x7fffa6c87690, flags=...) at kernel/qeventloop.cpp:149
#48 0x00007fd9fbfa5bb8 in QEventLoop::exec (this=0x7fffa6c87690, flags=...) at kernel/qeventloop.cpp:204
#49 0x00007fd9fbfaad78 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#50 0x0000000000402fc6 in main (argc=<optimized out>, argv=<optimized out>) at ../../kmail/main.cpp:158

Reported using DrKonqi