- Can you reproduce the crash at will all the times closing Kontact during the session ?
Thanks

Yes, pretty much any time I close Kontact (which is rare, really).

Backtrace from this round, if it helps at all.

Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0x42520ffa in KJob::error (this=) at ../../kdecore/jobs/kjob.cpp:211
#7  0x44c458b6 in ~KMAcctCachedImap (this=<value optimized out>, __in_chrg=<value optimized out>) at ../../kmail/kmacctcachedimap.cpp:67
#8  0x44bc27be in qDeleteAll<QList<KMAccount*>::const_iterator> (this=<value optimized out>, __in_chrg=<value optimized out>) at /usr/include/qt4/QtCore/qalgorithms.h:350
#9  qDeleteAll<AccountList> (this=<value optimized out>, __in_chrg=<value optimized out>) at /usr/include/qt4/QtCore/qalgorithms.h:358
#10 ~AccountManager (this=<value optimized out>, __in_chrg=<value optimized out>) at ../../kmail/accountmanager.cpp:39
#11 0x44ca7bd1 in KMKernel::cleanup (this=<value optimized out>) at ../../kmail/kmkernel.cpp:1716
#12 0xb520680b in ~KMailPart (this=0x9d9c6c8, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>) at ../../kmail/kmail_part.cpp:143
#13 0x435b95d9 in ~Plugin (this=<value optimized out>, __vtt_parm=<value optimized out>, __in_chrg=<value optimized out>) at ../../kontactinterfaces/plugin.cpp:86
#14 0xb52716ec in ~KMailPlugin (this=0x9d8c8b8, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>) at ../../../../kontact/plugins/kmail/kmail_plugin.cpp:150
#15 0x44248eb6 in ~MainWindow (this=<value optimized out>, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>) at ../../../kontact/src/mainwindow.cpp:274
#16 0x4208cb65 in qDeleteInEventHandler (o=<value optimized out>) at kernel/qobject.cpp:3814
#17 0x4208e43b in QObject::event (this=<value optimized out>, e=<value optimized out>) at kernel/qobject.cpp:1093
#18 0x428d6040 in QWidget::event (this=<value optimized out>, event=<value optimized out>) at kernel/qwidget.cpp:7946
#19 0x42c9a3d7 in QMainWindow::event (this=<value optimized out>, event=<value optimized out>) at widgets/qmainwindow.cpp:1399
#20 0x433c65f7 in KMainWindow::event (this=<value optimized out>, ev=<value optimized out>) at ../../kdeui/widgets/kmainwindow.cpp:1094
#21 0x4340b5bc in KXmlGuiWindow::event (this=<value optimized out>, ev=<value optimized out>) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:131
#22 0x428807d4 in QApplicationPrivate::notify_helper (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4056
#23 0x42888a12 in QApplication::notify (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4021
#24 0x432e400d in KApplication::notify (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at ../../kdeui/kernel/kapplication.cpp:302
#25 0x4207dfcb in QCoreApplication::notifyInternal (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at kernel/qcoreapplication.cpp:610
#26 0x4207ec0e in QCoreApplication::sendEvent (receiver=<value optimized out>, event_type=<value optimized out>, data=<value optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#27 QCoreApplicationPrivate::sendPostedEvents (receiver=<value optimized out>, event_type=<value optimized out>, data=<value optimized out>) at kernel/qcoreapplication.cpp:1247
#28 0x4207eded in QCoreApplication::sendPostedEvents (receiver=) at kernel/qcoreapplication.cpp:1140
#29 0x420a920f in QCoreApplication::sendPostedEvents (s=) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#30 postEventSourceDispatch (s=) at kernel/qeventdispatcher_glib.cpp:210
#31 0x41ae8368 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#32 0x41aeb8c3 in ?? () from /usr/lib/libglib-2.0.so.0
#33 0x41aeba48 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#34 0x420a8e58 in QEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#35 0x4291ff85 in QGuiEventDispatcherGlib::processEvents (this=) at kernel/qguieventdispatcher_glib.cpp:202
#36 0x4207c61a in QEventLoop::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:149
#37 0x4207ca62 in QEventLoop::exec (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:201
#38 0x4207eeb9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#39 0x42880657 in QApplication::exec () at kernel/qapplication.cpp:3525
#40 0x0804bd40 in main (argc=3, argv=0xbffc49b4) at ../../../kontact/src/main.cpp:218

I can confirm this bug. My Kontact also always crashes with the same backtrace on exit. I also have configured a Scalix account which is based on disconnected IMAP. A condition for the bug to occur is that you have the check for new mail at least once. I'm using Kontact version 4.3.1.

I too was using a Scalix account when this crash would happen; as of last week my company is no longer using Scalix;  I'll post back once the scalix accounts have been retired.

Just tried it again and this was the backtrace, if it helps at all:

Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0x00000000 in ?? ()
#7  0x4571759a in KMAcctCachedImap::killAllJobsInternal (this=<value optimized out>, disconnectSlave=<value optimized out>) at ../../kmail/kmacctcachedimap.cpp:130
#8  0x45718136 in ~KMAcctCachedImap (this=<value optimized out>, __in_chrg=<value optimized out>) at ../../kmail/kmacctcachedimap.cpp:67
#9  0x4569505e in qDeleteAll<QList<KMAccount*>::const_iterator> (this=<value optimized out>, __in_chrg=<value optimized out>) at /usr/include/qt4/QtCore/qalgorithms.h:350
#10 qDeleteAll<AccountList> (this=<value optimized out>, __in_chrg=<value optimized out>) at /usr/include/qt4/QtCore/qalgorithms.h:358
#11 ~AccountManager (this=<value optimized out>, __in_chrg=<value optimized out>) at ../../kmail/accountmanager.cpp:39
#12 0x45779e71 in KMKernel::cleanup (this=<value optimized out>) at ../../kmail/kmkernel.cpp:1733
#13 0xb51d080b in ~KMailPart (this=0x9eac580, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>) at ../../kmail/kmail_part.cpp:143
#14 0x413a25d9 in ~Plugin (this=<value optimized out>, __vtt_parm=<value optimized out>, __in_chrg=<value optimized out>) at ../../kontactinterfaces/plugin.cpp:86
#15 0xb52296ec in ~KMailPlugin (this=0x9e94550, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>) at ../../../../kontact/plugins/kmail/kmail_plugin.cpp:150
#16 0x4165aeb6 in ~MainWindow (this=<value optimized out>, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>) at ../../../kontact/src/mainwindow.cpp:274
#17 0x4fd87bc5 in qDeleteInEventHandler (o=<value optimized out>) at kernel/qobject.cpp:3814
#18 0x4fd8949b in QObject::event (this=<value optimized out>, e=<value optimized out>) at kernel/qobject.cpp:1093
#19 0x42e22080 in QWidget::event (this=<value optimized out>, event=<value optimized out>) at kernel/qwidget.cpp:7946
#20 0x431e6427 in QMainWindow::event (this=<value optimized out>, event=<value optimized out>) at widgets/qmainwindow.cpp:1399
#21 0x43d4b4f7 in KMainWindow::event (this=<value optimized out>, ev=<value optimized out>) at ../../kdeui/widgets/kmainwindow.cpp:1094
#22 0x43d900ec in KXmlGuiWindow::event (this=<value optimized out>, ev=<value optimized out>) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:131
#23 0x42dcc814 in QApplicationPrivate::notify_helper (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4056
#24 0x42dd4a52 in QApplication::notify (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4021
#25 0x43c68ead in KApplication::notify (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at ../../kdeui/kernel/kapplication.cpp:302
#26 0x4fd7902b in QCoreApplication::notifyInternal (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at kernel/qcoreapplication.cpp:610
#27 0x4fd79c6e in QCoreApplication::sendEvent (receiver=<value optimized out>, event_type=<value optimized out>, data=<value optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#28 QCoreApplicationPrivate::sendPostedEvents (receiver=<value optimized out>, event_type=<value optimized out>, data=<value optimized out>) at kernel/qcoreapplication.cpp:1247
#29 0x4fd79e4d in QCoreApplication::sendPostedEvents (receiver=) at kernel/qcoreapplication.cpp:1140
#30 0x4fda426f in QCoreApplication::sendPostedEvents (s=) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#31 postEventSourceDispatch (s=) at kernel/qeventdispatcher_glib.cpp:210
#32 0x4f978e98 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#33 0x4f97c623 in ?? () from /lib/libglib-2.0.so.0
#34 0x4f97c7a8 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#35 0x4fda3eb8 in QEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#36 0x42e6bfd5 in QGuiEventDispatcherGlib::processEvents (this=) at kernel/qguieventdispatcher_glib.cpp:202
#37 0x4fd7767a in QEventLoop::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:149
#38 0x4fd77ac2 in QEventLoop::exec (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:201
#39 0x4fd79f19 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#40 0x42dcc697 in QApplication::exec () at kernel/qapplication.cpp:3525
#41 0x0804bd40 in main (argc=1, argv=0xbfdf5254) at ../../../kontact/src/main.cpp:218

*** This bug has been marked as a duplicate of bug 195894 ***