Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-19-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I was checking my 4 separate IMAP'd e-mail accounts using Kontact and it crashed.
I believe I was in the middle of changing to a separate e-mail after having deleted 1+ old/read e-mails.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
The current source language is "auto; currently c".
[KCrash Handler]
#5  QBasicAtomicInt::ref (this=0x24f5760) at /usr/include/qt4/QtCore/qatomic_x86_64.h:121
#6  QList (this=0x24f5760) at /usr/include/qt4/QtCore/qlist.h:111
#7  KMail::FolderJob::msgList (this=0x24f5760) at ../../kmail/folderjob.cpp:120
#8  0x00007fb426e72b4e in KMAcctImap::ignoreJobsForFolder (this=0x137ac00, folder=<value optimized out>) at ../../kmail/kmacctimap.cpp:229
#9  0x00007fb426e9a2b0 in KMFolderImap::slotCheckValidityResult (this=0x125f020, job=<value optimized out>) at ../../kmail/kmfolderimap.cpp:1185
#10 0x00007fb426e9c905 in KMFolderImap::qt_metacall (this=0x125f020, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff4cf3dc20) at ./kmfolderimap.moc:179
#11 0x00007fb43c91addc in QMetaObject::activate (sender=0x24fbbe0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x27d9090) at kernel/qobject.cpp:3113
#12 0x00007fb43ccf0af2 in KJob::result (this=0x7fff4cf3d870, _t1=0x24fbbe0) at ./kjob.moc:188
#13 0x00007fb43ccf0e6f in KJob::emitResult (this=0x24fbbe0) at ../../kdecore/jobs/kjob.cpp:304
#14 0x00007fb43ad79d93 in KIO::SimpleJob::slotFinished (this=0x24fbbe0) at ../../kio/kio/job.cpp:477
#15 0x00007fb43ad7a253 in KIO::TransferJob::slotFinished (this=0x24fbbe0) at ../../kio/kio/job.cpp:948
#16 0x00007fb43ad78b61 in KIO::TransferJob::qt_metacall (this=0x24fbbe0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff4cf3e040) at ./jobclasses.moc:343
#17 0x00007fb43c91addc in QMetaObject::activate (sender=0x1861440, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x27d9090) at kernel/qobject.cpp:3113
#18 0x00007fb43ae3aa81 in KIO::SlaveInterface::dispatch (this=0x1861440, _cmd=104, rawdata=...) at ../../kio/kio/slaveinterface.cpp:175
#19 0x00007fb43ae37333 in KIO::SlaveInterface::dispatch (this=0x1861440) at ../../kio/kio/slaveinterface.cpp:91
#20 0x00007fb43ae2a14d in KIO::Slave::gotInput (this=0x1861440) at ../../kio/kio/slave.cpp:322
#21 0x00007fb43ae2c26c in KIO::Slave::qt_metacall (this=0x1861440, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff4cf3e400) at ./slave.moc:76
#22 0x00007fb43c91addc in QMetaObject::activate (sender=0x184cf10, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x27d9090) at kernel/qobject.cpp:3113
#23 0x00007fb43ad46f57 in KIO::ConnectionPrivate::dequeue (this=0x184e760) at ../../kio/kio/connection.cpp:82
#24 0x00007fb43ad4707d in KIO::Connection::qt_metacall (this=0x184cf10, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x467d250) at ./connection.moc:73
#25 0x00007fb43c9150f9 in QObject::event (this=0x184cf10, e=0x3a43660) at kernel/qobject.cpp:1111
#26 0x00007fb43d225efc in QApplicationPrivate::notify_helper (this=0xb20b20, receiver=0x184cf10, e=0x3a43660) at kernel/qapplication.cpp:4056
#27 0x00007fb43d22d1ce in QApplication::notify (this=0x7fff4cf3edc0, receiver=0x184cf10, e=0x3a43660) at kernel/qapplication.cpp:4021
#28 0x00007fb43de5cab6 in KApplication::notify (this=0x7fff4cf3edc0, receiver=0x184cf10, event=0x3a43660) at ../../kdeui/kernel/kapplication.cpp:302
#29 0x00007fb43c905c2c in QCoreApplication::notifyInternal (this=0x7fff4cf3edc0, receiver=0x184cf10, event=0x3a43660) at kernel/qcoreapplication.cpp:610
#30 0x00007fb43c90680a in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0xaeb080) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#31 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0xaeb080) at kernel/qcoreapplication.cpp:1247
#32 0x00007fb43c92e533 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#33 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:210
#34 0x00007fb43617fbce in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#35 0x00007fb436183598 in ?? () from /lib/libglib-2.0.so.0
#36 0x00007fb4361836c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#37 0x00007fb43c92e1a6 in QEventDispatcherGlib::processEvents (this=0xaeacb0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#38 0x00007fb43d2ba4be in QGuiEventDispatcherGlib::processEvents (this=0x7fff4cf3d870, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#39 0x00007fb43c904532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#40 0x00007fb43c904904 in QEventLoop::exec (this=0x7fff4cf3ed00, flags=) at kernel/qeventloop.cpp:201
#41 0x00007fb43c906ab9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#42 0x0000000000403f47 in main (argc=<value optimized out>, argv=<value optimized out>) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi