Application: kmail (4.11.2)
KDE Platform Version: 4.11.2
Qt Version: 4.8.4
Operating System: Linux 3.11.0-12-generic x86_64
Distribution: Ubuntu Trusty Tahr (development branch)

-- Information about the crash:
So i was trying to send an email but when i said send the "email spooler" told me it was offline and asked if i wanted to go online. There were two of such dialogs, after closing the second dialog kmail crashed with this backtrace.

-- 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 0x7fdb2dc4e800 (LWP 3765))]

Thread 6 (Thread 0x7fdb06aaa700 (LWP 3771)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fdb1f9491cd in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007fdb1f949209 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007fdb288b1f6e in start_thread (arg=0x7fdb06aaa700) at pthread_create.c:311
#4  0x00007fdb2afe99cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7fdb05afb700 (LWP 3772)):
#0  0x00007fdb231500ea in g_mutex_get_impl (mutex=0x7fdab80009a0) at /build/buildd/glib2.0-2.38.1/./glib/gthread-posix.c:124
#1  0x00007fdb231503c9 in g_mutex_unlock (mutex=mutex@entry=0x7fdab80009a0) at /build/buildd/glib2.0-2.38.1/./glib/gthread-posix.c:232
#2  0x00007fdb2311055d in g_main_context_iterate (context=context@entry=0x7fdab80009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3660
#3  0x00007fdb231107ac in g_main_context_iteration (context=0x7fdab80009a0, may_block=1) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3773
#4  0x00007fdb2c62aa76 in QEventDispatcherGlib::processEvents (this=0x7fdab80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#5  0x00007fdb2c5fc5ef in QEventLoop::processEvents (this=this@entry=0x7fdb05afad30, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007fdb2c5fc8e5 in QEventLoop::exec (this=this@entry=0x7fdb05afad30, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007fdb2c4fb88f in QThread::exec (this=this@entry=0x176ea80) at thread/qthread.cpp:542
#8  0x00007fdb2c5ddd13 in QInotifyFileSystemWatcherEngine::run (this=0x176ea80) at io/qfilesystemwatcher_inotify.cpp:265
#9  0x00007fdb2c4fdf2f in QThreadPrivate::start (arg=0x176ea80) at thread/qthread_unix.cpp:338
#10 0x00007fdb288b1f6e in start_thread (arg=0x7fdb05afb700) at pthread_create.c:311
#11 0x00007fdb2afe99cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 4 (Thread 0x7fdb04a6b700 (LWP 3773)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fdb1f689bbd in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007fdb1f978a76 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007fdb288b1f6e in start_thread (arg=0x7fdb04a6b700) at pthread_create.c:311
#4  0x00007fdb2afe99cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7fdabf353700 (LWP 3775)):
#0  g_mutex_get_impl (mutex=0x7fdaa80009a0) at /build/buildd/glib2.0-2.38.1/./glib/gthread-posix.c:126
#1  0x00007fdb231503c9 in g_mutex_unlock (mutex=mutex@entry=0x7fdaa80009a0) at /build/buildd/glib2.0-2.38.1/./glib/gthread-posix.c:232
#2  0x00007fdb2310fd40 in g_main_context_prepare (context=context@entry=0x7fdaa80009a0, priority=priority@entry=0x7fdabf352c38) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3337
#3  0x00007fdb231105c3 in g_main_context_iterate (context=context@entry=0x7fdaa80009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3692
#4  0x00007fdb231107ac in g_main_context_iteration (context=0x7fdaa80009a0, may_block=1) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3773
#5  0x00007fdb2c62aa76 in QEventDispatcherGlib::processEvents (this=0x7fdaa80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fdb2c5fc5ef in QEventLoop::processEvents (this=this@entry=0x7fdabf352d70, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fdb2c5fc8e5 in QEventLoop::exec (this=this@entry=0x7fdabf352d70, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fdb2c4fb88f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542
#9  0x00007fdb2c4fdf2f in QThreadPrivate::start (arg=0x1aeaa00) at thread/qthread_unix.cpp:338
#10 0x00007fdb288b1f6e in start_thread (arg=0x7fdabf353700) at pthread_create.c:311
#11 0x00007fdb2afe99cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7fdabdaa7700 (LWP 14336)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fdb16bb306b in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7fdb16eb0f00 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007fdb16bb30a9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007fdb288b1f6e in start_thread (arg=0x7fdabdaa7700) at pthread_create.c:311
#4  0x00007fdb2afe99cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7fdb2dc4e800 (LWP 3765)):
[KCrash Handler]
#6  text (this=0x0) at ../../include/QtGui/private/../../../src/gui/widgets/qlinecontrol_p.h:210
#7  QLineEdit::text (this=<optimized out>) at widgets/qlineedit.cpp:380
#8  0x00007fdb2cabc548 in KMComposeWin::from (this=this@entry=0x298d0f30) at ../../kmail/editor/kmcomposewin.cpp:1513
#9  0x00007fdb2cad683b in KMComposeWin::doSend (this=this@entry=0x298d0f30, method=method@entry=MessageComposer::MessageSender::SendImmediate, saveIn=saveIn@entry=MessageComposer::MessageSender::SaveInNone) at ../../kmail/editor/kmcomposewin.cpp:2657
#10 0x00007fdb2cad8bff in KMComposeWin::slotCheckSendNow (this=0x298d0f30) at ../../kmail/editor/kmcomposewin.cpp:2926
#11 0x00007fdb2cad9d41 in KMComposeWin::qt_static_metacall (_o=0x298d0f30, _id=0, _a=0x2b5f2a50, _c=<optimized out>) at ./kmcomposewin.moc:216
#12 0x00007fdb2c611a58 in QMetaObject::activate (sender=sender@entry=0xf888bd0, m=m@entry=0x7fdb2c443de0 <QAction::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fffeef61c00) at kernel/qobject.cpp:3539
#13 0x00007fdb2b994a32 in QAction::triggered (this=this@entry=0xf888bd0, _t1=false) at .moc/release-shared/moc_qaction.cpp:277
#14 0x00007fdb2b996403 in QAction::activate (this=0xf888bd0, event=event@entry=QAction::Trigger) at kernel/qaction.cpp:1257
#15 0x00007fdb2b99655c in QAction::event (this=<optimized out>, e=e@entry=0x7fffeef61fa0) at kernel/qaction.cpp:1183
#16 0x00007fdb2d5bdd3f in KAction::event (this=<optimized out>, event=0x7fffeef61fa0) at ../../kdeui/actions/kaction.cpp:131
#17 0x00007fdb2b99adfc in QApplicationPrivate::notify_helper (this=this@entry=0x12ba530, receiver=receiver@entry=0xf888bd0, e=e@entry=0x7fffeef61fa0) at kernel/qapplication.cpp:4567
#18 0x00007fdb2b9a1470 in QApplication::notify (this=this@entry=0x7fffeef63000, receiver=receiver@entry=0xf888bd0, e=e@entry=0x7fffeef61fa0) at kernel/qapplication.cpp:4353
#19 0x00007fdb2d693a6a in KApplication::notify (this=0x7fffeef63000, receiver=0xf888bd0, event=0x7fffeef61fa0) at ../../kdeui/kernel/kapplication.cpp:311
#20 0x00007fdb2c5fd8bd in QCoreApplication::notifyInternal (this=0x7fffeef63000, receiver=0xf888bd0, event=event@entry=0x7fffeef61fa0) at kernel/qcoreapplication.cpp:946
#21 0x00007fdb2b9cc1b6 in sendEvent (event=0x7fffeef61fa0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#22 QShortcutMap::dispatchEvent (this=this@entry=0x12ba650, e=e@entry=0x7fffeef622e0) at kernel/qshortcutmap.cpp:884
#23 0x00007fdb2b9cc2e4 in QShortcutMap::tryShortcutEvent (this=0x12ba650, o=o@entry=0x6e5a560, e=e@entry=0x7fffeef622e0) at kernel/qshortcutmap.cpp:364
#24 0x00007fdb2b9a2743 in QApplication::notify (this=this@entry=0x7fffeef63000, receiver=receiver@entry=0x6e5a560, e=e@entry=0x7fffeef622e0) at kernel/qapplication.cpp:3991
#25 0x00007fdb2d693a6a in KApplication::notify (this=0x7fffeef63000, receiver=0x6e5a560, event=0x7fffeef622e0) at ../../kdeui/kernel/kapplication.cpp:311
#26 0x00007fdb2c5fd8bd in QCoreApplication::notifyInternal (this=0x7fffeef63000, receiver=receiver@entry=0x6e5a560, event=event@entry=0x7fffeef622e0) at kernel/qcoreapplication.cpp:946
#27 0x00007fdb2b999526 in sendSpontaneousEvent (event=event@entry=0x7fffeef622e0, receiver=receiver@entry=0x6e5a560) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#28 qt_sendSpontaneousEvent (receiver=receiver@entry=0x6e5a560, event=event@entry=0x7fffeef622e0) at kernel/qapplication.cpp:5565
#29 0x00007fdb2ba39e19 in QKeyMapper::sendKeyEvent (keyWidget=keyWidget@entry=0x6e5a560, grab=grab@entry=false, type=QEvent::KeyPress, code=16777220, modifiers=..., text=..., autorepeat=autorepeat@entry=false, count=1, nativeScanCode=36, nativeVirtualKey=65293, nativeModifiers=4) at kernel/qkeymapper_x11.cpp:1866
#30 0x00007fdb2ba3a1b9 in QKeyMapperPrivate::translateKeyEvent (this=0x1356650, keyWidget=keyWidget@entry=0x6e5a560, event=event@entry=0x7fffeef62870, grab=grab@entry=false) at kernel/qkeymapper_x11.cpp:1836
#31 0x00007fdb2ba14207 in QApplication::x11ProcessEvent (this=0x7fffeef63000, event=event@entry=0x7fffeef62870) at kernel/qapplication_x11.cpp:3639
#32 0x00007fdb2ba3c922 in x11EventSourceDispatch (s=s@entry=0x12ac040, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#33 0x00007fdb231103b6 in g_main_dispatch (context=0x12baa10) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3065
#34 g_main_context_dispatch (context=context@entry=0x12baa10) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3641
#35 0x00007fdb23110708 in g_main_context_iterate (context=context@entry=0x12baa10, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3712
#36 0x00007fdb231107ac in g_main_context_iteration (context=0x12baa10, may_block=1) at /build/buildd/glib2.0-2.38.1/./glib/gmain.c:3773
#37 0x00007fdb2c62aa55 in QEventDispatcherGlib::processEvents (this=0x1243b00, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#38 0x00007fdb2ba3c9d6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#39 0x00007fdb2c5fc5ef in QEventLoop::processEvents (this=this@entry=0x7fffeef62c50, flags=...) at kernel/qeventloop.cpp:149
#40 0x00007fdb2c5fc8e5 in QEventLoop::exec (this=this@entry=0x7fffeef62c50, flags=...) at kernel/qeventloop.cpp:204
#41 0x00007fdb2c601e5b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#42 0x00007fdb2b99934c in QApplication::exec () at kernel/qapplication.cpp:3828
#43 0x0000000000402d1a in main (argc=<optimized out>, argv=<optimized out>) at ../../kmail/main.cpp:146

Reported using DrKonqi