Application: kmail (4.13)
KDE Platform Version: 4.13.0
Qt Version: 4.8.6
Operating System: Linux 3.13.11.2-ck1-kubuntu-amdf10-rjvb x86_64
Distribution: Ubuntu 14.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
I had cancelled a password dialog because I noticed that a message written after clicking on a mailto: link in my browser didn't have the desired From: address. In order to change that I tried to open the message from the outbox.
I got 1 or 2 errors about a missing .signature file, which I clicked away. I also probably double-clicked the message a 2nd time because of lack of progress feedback.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f1014add800 (LWP 12373))]

Thread 5 (Thread 0x7f0fec8f6700 (LWP 12377)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f10063d581d in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f10063d5859 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f100f70c182 in start_thread (arg=0x7f0fec8f6700) at pthread_create.c:312
#4  0x00007f1011e4b30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7f0fab764700 (LWP 12378)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f100611620d in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f1006404fd6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f100f70c182 in start_thread (arg=0x7f0fab764700) at pthread_create.c:312
#4  0x00007f1011e4b30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f0faa89c700 (LWP 12379)):
#0  0x00007f1011e3c6bd in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1009f0fc20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1009eceb14 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1009ecef7b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1009ecf0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f10127da7be in QEventDispatcherGlib::processEvents (this=0x7f0f9c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#6  0x00007f10127ac0af in QEventLoop::processEvents (this=this@entry=0x7f0faa89bde0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f10127ac3a5 in QEventLoop::exec (this=this@entry=0x7f0faa89bde0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007f10126a8c5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537
#9  0x00007f10126ab32f in QThreadPrivate::start (arg=0x251b000) at thread/qthread_unix.cpp:349
#10 0x00007f100f70c182 in start_thread (arg=0x7f0faa89c700) at pthread_create.c:312
#11 0x00007f1011e4b30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f0f98f9d700 (LWP 12626)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0ffc3eeffb in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f0ffc3ef039 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f100f70c182 in start_thread (arg=0x7f0f98f9d700) at pthread_create.c:312
#4  0x00007f1011e4b30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f1014add800 (LWP 12373)):
[KCrash Handler]
#6  QMutex::lock (this=this@entry=0x680073002f00ba) at thread/qmutex.cpp:150
#7  0x00007f10127b1139 in QCoreApplication::postEvent (receiver=0x39de950, event=0x701e6e0, priority=0) at kernel/qcoreapplication.cpp:1358
#8  0x00007f10127c187a in QMetaObject::activate (sender=sender@entry=0x39de950, m=m@entry=0x7f1013c173e0 <KMCommand::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffd5c9f570) at kernel/qobject.cpp:3539
#9  0x00007f101397c95e in KMCommand::messagesTransfered (this=this@entry=0x39de950, _t1=_t1@entry=KMCommand::OK) at moc_kmcommands.cpp:116
#10 0x00007f1013884f33 in KMCommand::slotJobFinished (this=0x39de950) at ../../kmail/kmcommands.cpp:367
#11 0x00007f10127c187a in QMetaObject::activate (sender=sender@entry=0x5a7d840, m=m@entry=0x7f10142e9600 <KJob::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7fffd5c9f710) at kernel/qobject.cpp:3539
#12 0x00007f1013f59622 in KJob::result (this=this@entry=0x5a7d840, _t1=_t1@entry=0x5a7d840) at ./kjob.moc:207
#13 0x00007f1013f59660 in KJob::emitResult (this=0x5a7d840) at ../../kdecore/jobs/kjob.cpp:318
#14 0x00007f10127c5c1e in QObject::event (this=0x5a7d840, e=<optimized out>) at kernel/qobject.cpp:1194
#15 0x00007f1012cdee2c in QApplicationPrivate::notify_helper (this=this@entry=0x1e25aa0, receiver=receiver@entry=0x5a7d840, e=e@entry=0x68316e0) at kernel/qapplication.cpp:4567
#16 0x00007f1012ce54a0 in QApplication::notify (this=this@entry=0x7fffd5ca00f0, receiver=receiver@entry=0x5a7d840, e=e@entry=0x68316e0) at kernel/qapplication.cpp:4353
#17 0x00007f1014519baa in KApplication::notify (this=0x7fffd5ca00f0, receiver=0x5a7d840, event=0x68316e0) at ../../kdeui/kernel/kapplication.cpp:311
#18 0x00007f10127ad4dd in QCoreApplication::notifyInternal (this=0x7fffd5ca00f0, receiver=receiver@entry=0x5a7d840, event=event@entry=0x68316e0) at kernel/qcoreapplication.cpp:953
#19 0x00007f10127b0b3d in sendEvent (event=0x68316e0, receiver=0x5a7d840) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#20 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1db8220) at kernel/qcoreapplication.cpp:1577
#21 0x00007f10127b0fe3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1470
#22 0x00007f10127daf83 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#23 postEventSourceDispatch (s=0x1e3fd00) at kernel/qeventdispatcher_glib.cpp:287
#24 0x00007f1009ecee04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f1009ecf048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f1009ecf0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f10127da7a1 in QEventDispatcherGlib::processEvents (this=0x1e27d60, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#28 0x00007f1012d80bb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#29 0x00007f10127ac0af in QEventLoop::processEvents (this=this@entry=0x7fffd5c9fd40, flags=...) at kernel/qeventloop.cpp:149
#30 0x00007f10127ac3a5 in QEventLoop::exec (this=this@entry=0x7fffd5c9fd40, flags=...) at kernel/qeventloop.cpp:204
#31 0x00007f10127b1b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#32 0x00007f1012cdd37c in QApplication::exec () at kernel/qapplication.cpp:3828
#33 0x0000000000402d18 in main (argc=<optimized out>, argv=<optimized out>) at ../../kmail/main.cpp:146

Reported using DrKonqi