Application: kontact (4.8.2)
KDE Platform Version: 4.8.2 (4.8.2)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-24-generic x86_64
Distribution: Ubuntu 12.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
trying to send an email reply. 
Kmail asked me to complete the "from" field, which I did and when I clicked send, kmail crashed. This happened on at least 5 occassions, including after two restarts of my computer

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".
[Current thread is 1 (Thread 0x7fed6fe187c0 (LWP 2182))]

Thread 4 (Thread 0x7fed533ae700 (LWP 2184)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fed6c60cdec in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007fed6c60cf19 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007fed67ad3e9a in start_thread (arg=0x7fed533ae700) at pthread_create.c:308
#4  0x00007fed6d33e4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fed52bad700 (LWP 2185)):
#0  0x00007fed67ad5f69 in __pthread_mutex_lock (mutex=0x7fed4c000a60) at pthread_mutex_lock.c:92
#1  0x00007fed67642561 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fed67606729 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fed67606f1b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fed67607124 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fed6dab3426 in QEventDispatcherGlib::processEvents (this=0x7fed4c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fed6da82c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fed6da82ed7 in QEventLoop::exec (this=0x7fed52bacdc0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fed6d981fa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007fed6d984fcb in QThreadPrivate::start (arg=0x1a65f40) at thread/qthread_unix.cpp:298
#10 0x00007fed67ad3e9a in start_thread (arg=0x7fed52bad700) at pthread_create.c:308
#11 0x00007fed6d33e4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fed05359700 (LWP 2189)):
#0  0x00007fed67642550 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fed67606ef5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fed67607124 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fed6dab3426 in QEventDispatcherGlib::processEvents (this=0x7fed000008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fed6da82c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fed6da82ed7 in QEventLoop::exec (this=0x7fed05358d90, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fed6d981fa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007fed6da629ff in QInotifyFileSystemWatcherEngine::run (this=0x1e60380) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fed6d984fcb in QThreadPrivate::start (arg=0x1e60380) at thread/qthread_unix.cpp:298
#9  0x00007fed67ad3e9a in start_thread (arg=0x7fed05359700) at pthread_create.c:308
#10 0x00007fed6d33e4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fed6fe187c0 (LWP 2182)):
[KCrash Handler]
#6  ref (this=0x3000000001) at /usr/include/qt4/QtCore/qatomic_x86_64.h:121
#7  QString (other=..., this=0x3689250) at /usr/include/qt4/QtCore/qstring.h:726
#8  Mailbox (this=0x3689250) at ../../kmime/kmime_header_parsing.h:68
#9  node_copy (src=<optimized out>, to=0x1b719f8, from=0x1b71ab0, this=0x7fff66d04dd0) at /usr/include/qt4/QtCore/qlist.h:399
#10 QList<KMime::Types::Mailbox>::detach_helper (this=0x7fff66d04dd0, alloc=<optimized out>) at /usr/include/qt4/QtCore/qlist.h:711
#11 0x00007fed644a9e3e in detach_helper (this=<optimized out>) at /usr/include/qt4/QtCore/qlist.h:725
#12 QList (this=<optimized out>, l=...) at /usr/include/qt4/QtCore/qlist.h:122
#13 QList (l=..., this=<optimized out>) at ../../kmime/kmime_headers.cpp:475
#14 KMime::Headers::Generics::MailboxList::mailboxes (this=<optimized out>) at ../../kmime/kmime_headers.cpp:477
#15 0x00007fecfe619fa7 in buildAddrStruct<KMime::Headers::From> (hdr=<optimized out>) at ../../plugins/akonadi_serializer_mail.cpp:151
#16 Akonadi::SerializerPluginMail::serialize (this=<optimized out>, item=..., label=..., data=..., version=<optimized out>) at ../../plugins/akonadi_serializer_mail.cpp:174
#17 0x00007fed69ebc29b in Akonadi::ItemSerializer::serialize (item=..., label=..., data=..., version=@0x7fff66d05a4c: 1) at ../../akonadi/itemserializer.cpp:126
#18 0x00007fed69ebc339 in Akonadi::ItemSerializer::serialize (item=..., label=..., data=..., version=@0x7fff66d05a4c: 1) at ../../akonadi/itemserializer.cpp:116
#19 0x00007fed69eae257 in Akonadi::ItemCreateJob::doStart (this=<optimized out>) at ../../akonadi/itemcreatejob.cpp:104
#20 0x00007fed69ec7326 in Akonadi::JobPrivate::startQueued (this=<optimized out>) at ../../akonadi/job.cpp:153
#21 0x00007fed69efbff9 in Akonadi::SessionPrivate::startJob (this=0x1ddcbe0, job=0x3686720) at ../../akonadi/session.cpp:267
#22 0x00007fed69eff52f in Akonadi::SessionPrivate::doStartNext (this=0x1ddcbe0) at ../../akonadi/session.cpp:256
#23 0x00007fed6da9d446 in QObject::event (this=0x1dd4190, e=<optimized out>) at kernel/qobject.cpp:1195
#24 0x00007fed6e478894 in notify_helper (e=0x1d4c600, receiver=0x1dd4190, this=0x18c4240) at kernel/qapplication.cpp:4559
#25 QApplicationPrivate::notify_helper (this=0x18c4240, receiver=0x1dd4190, e=0x1d4c600) at kernel/qapplication.cpp:4531
#26 0x00007fed6e47d713 in QApplication::notify (this=0x7fff66d06510, receiver=0x1dd4190, e=0x1d4c600) at kernel/qapplication.cpp:4420
#27 0x00007fed6f1b1b46 in KApplication::notify (this=0x7fff66d06510, receiver=0x1dd4190, event=0x1d4c600) at ../../kdeui/kernel/kapplication.cpp:311
#28 0x00007fed6da83e9c in QCoreApplication::notifyInternal (this=0x7fff66d06510, receiver=0x1dd4190, event=0x1d4c600) at kernel/qcoreapplication.cpp:876
#29 0x00007fed6da87c6a in sendEvent (event=0x1d4c600, receiver=0x1dd4190) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#30 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x188c380) at kernel/qcoreapplication.cpp:1500
#31 0x00007fed6dab2f93 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#32 postEventSourceDispatch (s=<optimized out>) at kernel/qeventdispatcher_glib.cpp:279
#33 0x00007fed67606c9a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007fed67607060 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007fed67607124 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007fed6dab33bf in QEventDispatcherGlib::processEvents (this=0x188dc10, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#37 0x00007fed6e520d5e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#38 0x00007fed6da82c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#39 0x00007fed6da82ed7 in QEventLoop::exec (this=0x7fff66d064a0, flags=...) at kernel/qeventloop.cpp:204
#40 0x00007fed6da87f67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#41 0x0000000000403629 in main (argc=1, argv=0x7fff66d06b38) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi