Application: kontact (4.14.10)
KDE Platform Version: 4.14.18 (Compiled from sources)
Qt Version: 4.8.6
Operating System: Linux 4.1.21-14-default x86_64
Distribution: "openSUSE Leap 42.1 (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:
"just" simply opening the application Kmail

- Custom settings of the application:
Most files (including the DB) are symlinked to a different partition on a different ssd, I have 6 main email imap account, and a lot of filters (that randomly works) and a Bogofilter that is as unreliable as kmail alltogether

The crash can be reproduced every time.

-- Backtrace:
Application: Kontact (kontact), signal: Aborted
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f1ebed08800 (LWP 2490))]

Thread 4 (Thread 0x7f1ea2093700 (LWP 2491)):
#0  0x00007f1eb626503f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f1ebb3eceb6 in WTF::TCMalloc_PageHeap::scavengerThread() () at /usr/lib64/libQtWebKit.so.4
#2  0x00007f1ebb3ecee9 in  () at /usr/lib64/libQtWebKit.so.4
#3  0x00007f1eb62610a4 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f1ebc1dcfed in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f1e61790700 (LWP 2492)):
#0  0x00007f1eb626503f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f1ebb15fb3d in JSC::BlockAllocator::blockFreeingThreadMain() () at /usr/lib64/libQtWebKit.so.4
#2  0x00007f1ebb414a06 in WTF::wtfThreadEntryPoint(void*) () at /usr/lib64/libQtWebKit.so.4
#3  0x00007f1eb62610a4 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f1ebc1dcfed in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f1e5234f700 (LWP 2496)):
#0  0x00007f1ebc1d4bbd in poll () at /lib64/libc.so.6
#1  0x00007f1eb5c94e64 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f1eb5c94f7c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f1ebc9d3fde in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#4  0x00007f1ebc9a5d4f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#5  0x00007f1ebc9a6045 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#6  0x00007f1ebc8a34df in QThread::exec() () at /usr/lib64/libQtCore.so.4
#7  0x00007f1ebc8a5bbf in  () at /usr/lib64/libQtCore.so.4
#8  0x00007f1eb62610a4 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f1ebc1dcfed in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f1ebed08800 (LWP 2490)):
[KCrash Handler]
#6  0x00007f1ebc12d0a7 in raise () at /lib64/libc.so.6
#7  0x00007f1ebc12e458 in abort () at /lib64/libc.so.6
#8  0x00007f1ebc89b6d4 in qt_message_output(QtMsgType, char const*) () at /usr/lib64/libQtCore.so.4
#9  0x00007f1ebc89b859 in  () at /usr/lib64/libQtCore.so.4
#10 0x00007f1ebc89c064 in qFatal(char const*, ...) () at /usr/lib64/libQtCore.so.4
#11 0x00007f1e576d9d84 in MailCommon::Kernel::self() () at /usr/lib64/libmailcommon.so.4
#12 0x00007f1e57721fd0 in MailCommon::FolderCollection::writeConfig() const () at /usr/lib64/libmailcommon.so.4
#13 0x00007f1e577227d2 in MailCommon::FolderCollection::~FolderCollection() () at /usr/lib64/libmailcommon.so.4
#14 0x00007f1e57722849 in MailCommon::FolderCollection::~FolderCollection() () at /usr/lib64/libmailcommon.so.4
#15 0x00007f1e57721104 in  () at /usr/lib64/libmailcommon.so.4
#16 0x00007f1ebc12fb19 in __run_exit_handlers () at /lib64/libc.so.6
#17 0x00007f1ebc12fb65 in  () at /lib64/libc.so.6
#18 0x00007f1e576da457 in MailCommon::Kernel::emergencyExit(QString const&) () at /usr/lib64/libmailcommon.so.4
#19 0x00007f1e576daa17 in MailCommon::Kernel::createDefaultCollectionDone(KJob*) () at /usr/lib64/libmailcommon.so.4
#20 0x00007f1ebc9bb0fa in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () at /usr/lib64/libQtCore.so.4
#21 0x00007f1ebce3b132 in KJob::result(KJob*) () at /usr/lib64/libkdecore.so.5
#22 0x00007f1ebce3b170 in KJob::emitResult() () at /usr/lib64/libkdecore.so.5
#23 0x00007f1eb828cde9 in  () at /usr/lib64/libakonadi-kde.so.4
#24 0x00007f1ebc9bb0fa in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () at /usr/lib64/libQtCore.so.4
#25 0x00007f1ebce3b132 in KJob::result(KJob*) () at /usr/lib64/libkdecore.so.5
#26 0x00007f1ebce3b170 in KJob::emitResult() () at /usr/lib64/libkdecore.so.5
#27 0x00007f1eb8286623 in  () at /usr/lib64/libakonadi-kde.so.4
#28 0x00007f1ebc9bb0fa in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () at /usr/lib64/libQtCore.so.4
#29 0x00007f1ebc9bf2b1 in QObject::event(QEvent*) () at /usr/lib64/libQtCore.so.4
#30 0x00007f1ebd3b179c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQtGui.so.4
#31 0x00007f1ebd3b7cdd in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQtGui.so.4
#32 0x00007f1ebe0c8e9a in KApplication::notify(QObject*, QEvent*) () at /usr/lib64/libkdeui.so.5
#33 0x00007f1ebc9a718d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQtCore.so.4
#34 0x00007f1ebc9d6bbc in  () at /usr/lib64/libQtCore.so.4
#35 0x00007f1ebc9d3e01 in  () at /usr/lib64/libQtCore.so.4
#36 0x00007f1eb5c94c84 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0
#37 0x00007f1eb5c94ed8 in  () at /usr/lib64/libglib-2.0.so.0
#38 0x00007f1eb5c94f7c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#39 0x00007f1ebc9d3fbe in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#40 0x00007f1ebd44e6a6 in  () at /usr/lib64/libQtGui.so.4
#41 0x00007f1ebc9a5d4f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#42 0x00007f1ebc9a6045 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#43 0x00007f1ebc9ab499 in QCoreApplication::exec() () at /usr/lib64/libQtCore.so.4
#44 0x00000000004037f2 in  ()
#45 0x00007f1ebc119b05 in __libc_start_main () at /lib64/libc.so.6
#46 0x0000000000403c97 in _start ()

Reported using DrKonqi