Application: kontact (4.12 rc1)
KDE Platform Version: 4.11.97
Qt Version: 4.8.4
Operating System: Linux 3.11.0-15-generic x86_64
Distribution: Ubuntu 13.10

-- Information about the crash:
- What I was doing when the application crashed: Deleting mail from a Gmail (IMAP) account. Folders do not appear to be in sync and when this happens, every email takes a long time to download. Once downloaded, if I select messages to move to trash, I will get either:

A. A message saying the message could not be moved to trash (probably because it already was a some point in the past, but is still showing up in my message list); or
B. Kontact will crash when attempting to move messages to trash.

This is new behaviour that did not happen in the past.

The crash can be reproduced sometimes.

-- 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 0x7f2e3f2ac800 (LWP 5958))]

Thread 6 (Thread 0x7f2e216f6700 (LWP 5959)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f2e3a19b1cd in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f2e3a19b209 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f2e368c0f6e in start_thread (arg=0x7f2e216f6700) at pthread_create.c:311
#4  0x00007f2e3c9349cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7f2de0df3700 (LWP 5960)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f2e39edbbbd in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f2e3a1caa76 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f2e368c0f6e in start_thread (arg=0x7f2de0df3700) at pthread_create.c:311
#4  0x00007f2e3c9349cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 4 (Thread 0x7f2dcaf6f700 (LWP 5970)):
#0  0x00007f2e364280ed in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f2e36428399 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2e363e8595 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2e363e87ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2e3d0ada76 in QEventDispatcherGlib::processEvents (this=0x7f2db80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#5  0x00007f2e3d07f5ef in QEventLoop::processEvents (this=this@entry=0x7f2dcaf6ed70, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f2e3d07f8e5 in QEventLoop::exec (this=this@entry=0x7f2dcaf6ed70, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007f2e3cf7e88f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542
#8  0x00007f2e3cf80f2f in QThreadPrivate::start (arg=0x10264c0) at thread/qthread_unix.cpp:338
#9  0x00007f2e368c0f6e in start_thread (arg=0x7f2dcaf6f700) at pthread_create.c:311
#10 0x00007f2e3c9349cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7f2dc9321700 (LWP 5974)):
#0  0x00007f2e364280ed in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f2e36428399 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2e363e8659 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2e363e87ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2e3d0ada76 in QEventDispatcherGlib::processEvents (this=0x7f2dbc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#5  0x00007f2e3d07f5ef in QEventLoop::processEvents (this=this@entry=0x7f2dc9320d30, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f2e3d07f8e5 in QEventLoop::exec (this=this@entry=0x7f2dc9320d30, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007f2e3cf7e88f in QThread::exec (this=this@entry=0x19a25e0) at thread/qthread.cpp:542
#8  0x00007f2e3d060d13 in QInotifyFileSystemWatcherEngine::run (this=0x19a25e0) at io/qfilesystemwatcher_inotify.cpp:265
#9  0x00007f2e3cf80f2f in QThreadPrivate::start (arg=0x19a25e0) at thread/qthread_unix.cpp:338
#10 0x00007f2e368c0f6e in start_thread (arg=0x7f2dc9321700) at pthread_create.c:311
#11 0x00007f2e3c9349cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f2dcb770700 (LWP 6964)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007f2e3cf813e4 in wait (time=30000, this=0x256e210) at thread/qwaitcondition_unix.cpp:84
#2  QWaitCondition::wait (this=<optimized out>, mutex=mutex@entry=0x256f778, time=30000) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f2e3cf748a5 in QThreadPoolThread::run (this=0x256c920) at concurrent/qthreadpool.cpp:141
#4  0x00007f2e3cf80f2f in QThreadPrivate::start (arg=0x256c920) at thread/qthread_unix.cpp:338
#5  0x00007f2e368c0f6e in start_thread (arg=0x7f2dcb770700) at pthread_create.c:311
#6  0x00007f2e3c9349cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7f2e3f2ac800 (LWP 5958)):
[KCrash Handler]
#6  0x00007f2e3dec3424 in QTabWidget::currentWidget (this=0x13e7930) at widgets/qtabwidget.cpp:634
#7  0x00007f2dd60836f0 in MessageList::Pane::markMessageItemsAsAboutToBeRemoved(long, bool) () from /usr/lib/libmessagelist.so.4
#8  0x00007f2dd6cec86e in KMMainWidget::slotTrashMessagesCompleted(KMMoveCommand*) () from /usr/lib/libkmailprivate.so.4
#9  0x00007f2dd6d0ecf3 in ?? () from /usr/lib/libkmailprivate.so.4
#10 0x00007f2e3d094a58 in QMetaObject::activate (sender=0x31f2e00, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fffd2738980) at kernel/qobject.cpp:3539
#11 0x00007f2dd6cd83ef in KMMoveCommand::moveDone(KMMoveCommand*) () from /usr/lib/libkmailprivate.so.4
#12 0x00007f2dd6cd842f in KMMoveCommand::completeMove(KMCommand::Result) () from /usr/lib/libkmailprivate.so.4
#13 0x00007f2e3d094a58 in QMetaObject::activate (sender=sender@entry=0x29d3bf0, m=m@entry=0x7f2e3d898600 <KJob::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7fffd2738ad0) at kernel/qobject.cpp:3539
#14 0x00007f2e3d5091f2 in KJob::result (this=this@entry=0x29d3bf0, _t1=_t1@entry=0x29d3bf0) at ./kjob.moc:208
#15 0x00007f2e3d509230 in KJob::emitResult (this=0x29d3bf0) at ../../kdecore/jobs/kjob.cpp:318
#16 0x00007f2e3b94c1c1 in ?? () from /usr/lib/libakonadi-kde.so.4
#17 0x00007f2e3b98ce39 in ?? () from /usr/lib/libakonadi-kde.so.4
#18 0x00007f2e3d094a58 in QMetaObject::activate (sender=0x1223a70, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3539
#19 0x00007f2e3d094a58 in QMetaObject::activate (sender=sender@entry=0x1359648, m=m@entry=0x7f2e3d3e2540 <QIODevice::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3539
#20 0x00007f2e3d0dd780 in QIODevice::readyRead (this=this@entry=0x1359648) at .moc/release-shared/moc_qiodevice.cpp:105
#21 0x00007f2e37970b3d in QAbstractSocketPrivate::canReadNotification (this=0x1303f40) at socket/qabstractsocket.cpp:654
#22 0x00007f2e37979b8d in QReadNotifier::event (this=<optimized out>, e=<optimized out>) at socket/qnativesocketengine.cpp:1151
#23 0x00007f2e3da70dfc in QApplicationPrivate::notify_helper (this=this@entry=0xe03570, receiver=receiver@entry=0x12cea60, e=e@entry=0x7fffd2739080) at kernel/qapplication.cpp:4567
#24 0x00007f2e3da77470 in QApplication::notify (this=this@entry=0x7fffd2739d20, receiver=receiver@entry=0x12cea60, e=e@entry=0x7fffd2739080) at kernel/qapplication.cpp:4353
#25 0x00007f2e3e77ad9a in KApplication::notify (this=0x7fffd2739d20, receiver=0x12cea60, event=0x7fffd2739080) at ../../kdeui/kernel/kapplication.cpp:311
#26 0x00007f2e3d0808bd in QCoreApplication::notifyInternal (this=0x7fffd2739d20, receiver=0x12cea60, event=event@entry=0x7fffd2739080) at kernel/qcoreapplication.cpp:946
#27 0x00007f2e3d0ae590 in sendEvent (event=0x7fffd2739080, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#28 socketNotifierSourceDispatch (source=0xe037b0) at kernel/qeventdispatcher_glib.cpp:110
#29 0x00007f2e363e83b6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f2e363e8708 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f2e363e87ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f2e3d0ada55 in QEventDispatcherGlib::processEvents (this=0xdc5690, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#33 0x00007f2e3db129d6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#34 0x00007f2e3d07f5ef in QEventLoop::processEvents (this=this@entry=0x7fffd27392d0, flags=...) at kernel/qeventloop.cpp:149
#35 0x00007f2e3d07f8e5 in QEventLoop::exec (this=0x7fffd27392d0, flags=...) at kernel/qeventloop.cpp:204
#36 0x00007f2e3d50a3d3 in KJob::exec (this=0x13bdc80) at ../../kdecore/jobs/kjob.cpp:210
#37 0x00007f2dd6cbed76 in KMKernel::cleanup() () from /usr/lib/libkmailprivate.so.4
#38 0x00007f2dd7028cd5 in ?? () from /usr/lib/kde4/kmailpart.so
#39 0x00007f2dd7028da9 in ?? () from /usr/lib/kde4/kmailpart.so
#40 0x00007f2e3eff4cbe in KontactInterface::Plugin::~Plugin() () from /usr/lib/libkontactinterface.so.4
#41 0x00007f2dd9645a9f in ?? () from /usr/lib/kde4/kontact_kmailplugin.so
#42 0x00007f2dd9645ac9 in ?? () from /usr/lib/kde4/kontact_kmailplugin.so
#43 0x00007f2e3ebbcfee in Kontact::MainWindow::~MainWindow() () from /usr/lib/libkontactprivate.so.4
#44 0x00007f2e3ebbd149 in Kontact::MainWindow::~MainWindow() () from /usr/lib/libkontactprivate.so.4
#45 0x00007f2e3d098e08 in QObject::event (this=this@entry=0xf9eb60, e=e@entry=0x1a36e50) at kernel/qobject.cpp:1175
#46 0x00007f2e3dac036b in QWidget::event (this=this@entry=0xf9eb60, event=event@entry=0x1a36e50) at kernel/qwidget.cpp:8845
#47 0x00007f2e3de79db3 in QMainWindow::event (this=this@entry=0xf9eb60, event=event@entry=0x1a36e50) at widgets/qmainwindow.cpp:1478
#48 0x00007f2e3e82f2d1 in KMainWindow::event (this=this@entry=0xf9eb60, ev=ev@entry=0x1a36e50) at ../../kdeui/widgets/kmainwindow.cpp:1084
#49 0x00007f2e3e866d69 in KXmlGuiWindow::event (this=0xf9eb60, ev=0x1a36e50) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:126
#50 0x00007f2e3da70dfc in QApplicationPrivate::notify_helper (this=this@entry=0xe03570, receiver=receiver@entry=0xf9eb60, e=e@entry=0x1a36e50) at kernel/qapplication.cpp:4567
#51 0x00007f2e3da77470 in QApplication::notify (this=this@entry=0x7fffd2739d20, receiver=receiver@entry=0xf9eb60, e=e@entry=0x1a36e50) at kernel/qapplication.cpp:4353
#52 0x00007f2e3e77ad9a in KApplication::notify (this=0x7fffd2739d20, receiver=0xf9eb60, event=0x1a36e50) at ../../kdeui/kernel/kapplication.cpp:311
#53 0x00007f2e3d0808bd in QCoreApplication::notifyInternal (this=0x7fffd2739d20, receiver=receiver@entry=0xf9eb60, event=event@entry=0x1a36e50) at kernel/qcoreapplication.cpp:946
#54 0x00007f2e3d083e1f in sendEvent (event=0x1a36e50, receiver=0xf9eb60) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#55 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0xdc41d0) at kernel/qcoreapplication.cpp:1570
#56 0x00007f2e3d0842c3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1463
#57 0x00007f2e3d0ae073 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#58 postEventSourceDispatch (s=0xdfef30) at kernel/qeventdispatcher_glib.cpp:279
#59 0x00007f2e363e83b6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#60 0x00007f2e363e8708 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#61 0x00007f2e363e87ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#62 0x00007f2e3d0ada55 in QEventDispatcherGlib::processEvents (this=0xdc5690, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#63 0x00007f2e3db129d6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#64 0x00007f2e3d07f5ef in QEventLoop::processEvents (this=this@entry=0x7fffd2739c20, flags=...) at kernel/qeventloop.cpp:149
#65 0x00007f2e3d07f8e5 in QEventLoop::exec (this=this@entry=0x7fffd2739c20, flags=...) at kernel/qeventloop.cpp:204
#66 0x00007f2e3d084e5b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#67 0x0000000000403660 in ?? ()
#68 0x00007f2e3c85bde5 in __libc_start_main (main=0x402bb0, argc=1, ubp_av=0x7fffd2739e68, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffd2739e58) at libc-start.c:260
#69 0x0000000000403b28 in _start ()

Reported using DrKonqi