Application: kontact (4.4.11)
KDE Platform Version: 4.8.4 (4.8.4)
Qt Version: 4.8.2
Operating System: Linux 3.2.0-1-amd64 x86_64
Distribution: Debian GNU/Linux testing (wheezy)

-- Information about the crash:
it seems that Kmail cannot connect (or cannot read mails after connection) to account; but no error message is shown on GUI; 
after exiting Kmail the KDE crash handler pops up and informs about a signal 11 exception

The crash can be reproduced every time.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  unicode (this=<optimized out>) at /usr/include/qt4/QtCore/qchar.h:251
#7  KStringHandler::obscure (str=...) at ../../kdecore/text/kstringhandler.cpp:197
#8  0x00007f9ce00a53c1 in KMail::NetworkAccount::passwd (this=<optimized out>) at ../../kmail/networkaccount.cpp:96
#9  0x00007f9ce0109ce5 in KMail::PopAccount::processNewMail (this=0x2894a90, _interactive=true) at ../../kmail/popaccount.cpp:145
#10 0x00007f9ce0056620 in KMail::AccountManager::processNextCheck (this=this@entry=0x25c6590, _newMail=_newMail@entry=false) at ../../kmail/accountmanager.cpp:231
#11 0x00007f9ce0056f3a in KMail::AccountManager::singleCheckMail (this=this@entry=0x25c6590, account=0x2894a90, interactive=interactive@entry=true) at ../../kmail/accountmanager.cpp:157
#12 0x00007f9ce0057221 in KMail::AccountManager::checkMail (this=0x25c6590, _interactive=true) at ../../kmail/accountmanager.cpp:353
#13 0x00007f9ce01e4cea in KMMainWidget::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at ./kmmainwidget.moc:340
#14 0x00007f9cfc9755cf in QMetaObject::activate (sender=0x260f6c0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff48799f80) at kernel/qobject.cpp:3547
#15 0x00007f9cfbd03502 in QAction::triggered (this=this@entry=0x260f6c0, _t1=false) at .moc/release-shared/moc_qaction.cpp:277
#16 0x00007f9cfbd036f0 in QAction::activate (this=0x260f6c0, event=<optimized out>) at kernel/qaction.cpp:1257
#17 0x00007f9cfc0c3b9f in QAbstractButtonPrivate::click (this=this@entry=0x8eb2f80) at widgets/qabstractbutton.cpp:530
#18 0x00007f9cfc0c3e4c in QAbstractButton::mouseReleaseEvent (this=0x2a76890, e=0x7fff4879a830) at widgets/qabstractbutton.cpp:1123
#19 0x00007f9cfc17de0a in QToolButton::mouseReleaseEvent (this=<optimized out>, e=<optimized out>) at widgets/qtoolbutton.cpp:718
#20 0x00007f9cfbd58ed0 in QWidget::event (this=0x2a76890, event=0x7fff4879a830) at kernel/qwidget.cpp:8371
#21 0x00007f9cfbd0970c in QApplicationPrivate::notify_helper (this=this@entry=0x1f50f90, receiver=receiver@entry=0x2a76890, e=e@entry=0x7fff4879a830) at kernel/qapplication.cpp:4556
#22 0x00007f9cfbd0e3eb in QApplication::notify (this=<optimized out>, receiver=0x2a76890, e=0x7fff4879a830) at kernel/qapplication.cpp:4099
#23 0x00007f9cfd3ec8a6 in KApplication::notify (this=0x7fff4879b500, receiver=0x2a76890, event=0x7fff4879a830) at ../../kdeui/kernel/kapplication.cpp:311
#24 0x00007f9cfc95fbde in QCoreApplication::notifyInternal (this=0x7fff4879b500, receiver=0x2a76890, event=0x7fff4879a830) at kernel/qcoreapplication.cpp:915
#25 0x00007f9cfbd0a54b in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#26 QApplicationPrivate::sendMouseEvent (receiver=0x2a76890, event=0x7fff4879a830, alienWidget=0x2a76890, nativeWidget=0x2370410, buttonDown=0x7f9cfc7df2a8, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3167
#27 0x00007f9cfbd850f4 in QETWidget::translateMouseEvent (this=this@entry=0x2370410, event=event@entry=0x7fff4879afa0) at kernel/qapplication_x11.cpp:4523
#28 0x00007f9cfbd83e81 in QApplication::x11ProcessEvent (this=0x7fff4879b500, event=0x7fff4879afa0) at kernel/qapplication_x11.cpp:3646
#29 0x00007f9cfbdaacf2 in x11EventSourceDispatch (s=0x1f4f4c0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#30 0x00007f9cf463d205 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f9cf463d538 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f9cf463d5f4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007f9cfc98e2e6 in QEventDispatcherGlib::processEvents (this=0x1f1db60, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#34 0x00007f9cfbdaa96e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#35 0x00007f9cfc95e92f in QEventLoop::processEvents (this=this@entry=0x7fff4879b370, flags=...) at kernel/qeventloop.cpp:149
#36 0x00007f9cfc95ebb8 in QEventLoop::exec (this=0x7fff4879b370, flags=...) at kernel/qeventloop.cpp:204
#37 0x00007f9cfc963d78 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#38 0x0000000000403696 in main (argc=1, argv=0x7fff4879b648) at ../../../kontact/src/main.cpp:226

Possible duplicates by query: bug 202542.

Reported using DrKonqi