Application: kmail (4.14.3)
KDE Platform Version: 4.14.3
Qt Version: 4.8.6
Operating System: Linux 3.16.6-2-desktop x86_64
Distribution: "openSUSE 13.2 (Harlequin) (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:
Filtering stopped but otherwise seemed functional.  Then kmail seems unable to not be able to open any folders.  Normally, I wait for a few minutes. After no success, I close kmail.  When I try to restart it it crashes.

The crash can be reproduced every time.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f50c546f800 (LWP 2804))]

Thread 5 (Thread 0x7f50a0104700 (LWP 2813)):
#0  0x00007f50c05ee05f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f50b5b1c686 in WTF::TCMalloc_PageHeap::scavengerThread() () at /usr/lib64/libQtWebKit.so.4
#2  0x00007f50b5b1c6b9 in  () at /usr/lib64/libQtWebKit.so.4
#3  0x00007f50c05ea0a4 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f50c27e97fd in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f505ef71700 (LWP 2814)):
#0  0x00007f50c05ee05f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f50b588ee7d in JSC::BlockAllocator::blockFreeingThreadMain() () at /usr/lib64/libQtWebKit.so.4
#2  0x00007f50b5b441e6 in WTF::wtfThreadEntryPoint(void*) () at /usr/lib64/libQtWebKit.so.4
#3  0x00007f50c05ea0a4 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f50c27e97fd in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f505e059700 (LWP 2815)):
#0  0x00007f50ba346318 in g_main_context_prepare () at /usr/lib64/libglib-2.0.so.0
#1  0x00007f50ba346b03 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f50ba346cec in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f50c3e3c0de in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#4  0x00007f50c3e0de6f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#5  0x00007f50c3e0e165 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#6  0x00007f50c3d0b0bf in QThread::exec() () at /usr/lib64/libQtCore.so.4
#7  0x00007f50c3d0d79f in  () at /usr/lib64/libQtCore.so.4
#8  0x00007f50c05ea0a4 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f50c27e97fd in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f505c909700 (LWP 2816)):
#0  0x00007f50c27e13cd in poll () at /lib64/libc.so.6
#1  0x00007f50ba346be4 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f50ba346cec in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f50c3e3c0de in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#4  0x00007f50c3e0de6f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#5  0x00007f50c3e0e165 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#6  0x00007f50c3d0b0bf in QThread::exec() () at /usr/lib64/libQtCore.so.4
#7  0x00007f50c3def783 in  () at /usr/lib64/libQtCore.so.4
#8  0x00007f50c3d0d79f in  () at /usr/lib64/libQtCore.so.4
#9  0x00007f50c05ea0a4 in start_thread () at /lib64/libpthread.so.0
#10 0x00007f50c27e97fd in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f50c546f800 (LWP 2804)):
[KCrash Handler]
#5  0x00007f50c3d50c88 in QString::operator==(QString const&) const () at /usr/lib64/libQtCore.so.4
#6  0x00007f50c500b93c in KStatusNotifierItem::setToolTipSubTitle(QString const&) () at /usr/lib64/libkdeui.so.5
#7  0x00007f50c4224c3e in  () at /usr/lib64/libkmailprivate.so.4
#8  0x00007f50c4224b1d in  () at /usr/lib64/libkmailprivate.so.4
#9  0x00007f50c4224b1d in  () at /usr/lib64/libkmailprivate.so.4
#10 0x00007f50c4224df5 in  () at /usr/lib64/libkmailprivate.so.4
#11 0x00007f50c422d875 in KMKernel::toggleSystemTray() () at /usr/lib64/libkmailprivate.so.4
#12 0x00007f50c425de8f in KMMainWidget::readConfig() () at /usr/lib64/libkmailprivate.so.4
#13 0x00007f50c426d20b in KMMainWidget::KMMainWidget(QWidget*, KXMLGUIClient*, KActionCollection*, KSharedPtr<KSharedConfig>) () at /usr/lib64/libkmailprivate.so.4
#14 0x00007f50c421cf98 in  () at /usr/lib64/libkmailprivate.so.4
#15 0x00007f50c422c52f in KMKernel::openReader(bool) () at /usr/lib64/libkmailprivate.so.4
#16 0x00007f50c42305b8 in KMKernel::action(bool, bool, QString const&, QString const&, QString const&, QString const&, QString const&, KUrl const&, KUrl::List const&, QStringList const&, QString const&, QString const&) () at /usr/lib64/libkmailprivate.so.4
#17 0x00007f50c42310ab in KMKernel::handleCommandLine(bool) () at /usr/lib64/libkmailprivate.so.4
#18 0x00000000004035c7 in _start ()

Reported using DrKonqi