I was wrong, this is completely regular crash. KMail crashes every times. The IMAP folder contains an opensuse@opensuse.org mailing list. The better backtrace (including qt4 debug) is here:

Application: KMail (kmail), signal SIGSEGV
[?1034h[Thread debugging using libthread_db enabled]
0x00007f4de2d0bce1 in nanosleep () from /lib64/libc.so.6
[Current thread is 1 (Thread 0x7f4de824b750 (LWP 11735))]

Thread 2 (Thread 0x7f4dcd1d7950 (LWP 11738)):
#0  0x00007f4de47a5fdd in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4de4a16f07 in QWaitCondition::wait (this=0xf29ad8, mutex=0xf29ad0, time=30000) at thread/qwaitcondition_unix.cpp:80
#2  0x00007f4de4a0d129 in QThreadPoolThread::run (this=0xe09df0) at concurrent/qthreadpool.cpp:135
#3  0x00007f4de4a15f72 in QThreadPrivate::start (arg=0xe09df0) at thread/qthread_unix.cpp:185
#4  0x00007f4de47a2070 in start_thread () from /lib64/libpthread.so.0
#5  0x00007f4de2d3d0ed in clone () from /lib64/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f4de824b750 (LWP 11735)):
[KCrash Handler]
#5  0x0000000800000001 in ?? ()
#6  0x00007f4de6f72402 in KMFolderImap::slotListFolderResult (this=0xb0ab30, job=0x1180fb0) at /usr/src/debug/kdepim-4.1.87/kmail/kmfolderimap.cpp:1355
#7  0x00007f4de6f78684 in KMFolderImap::qt_metacall (this=0xb0ab30, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffff0292aa0)
    at /usr/src/debug/kdepim-4.1.87/build/kmail/kmfolderimap.moc:181
#8  0x00007f4de4b12454 in QMetaObject::activate (sender=0x1180fb0, from_signal_index=<value optimized out>, to_signal_index=7, argv=0x0) at kernel/qobject.cpp:3031
#9  0x00007f4de772d552 in KJob::result (this=0x1498c50, _t1=0x1180fb0) at /usr/src/debug/kdelibs-4.1.87/build/kdecore/kjob.moc:186
#10 0x00007f4de772d8cf in KJob::emitResult (this=0x1180fb0) at /usr/src/debug/kdelibs-4.1.87/kdecore/jobs/kjob.cpp:294
#11 0x00007f4de537e900 in KIO::SimpleJob::slotFinished (this=0x1180fb0) at /usr/src/debug/kdelibs-4.1.87/kio/kio/job.cpp:489
#12 0x00007f4de537ea35 in KIO::ListJob::slotFinished (this=0x1180fb0) at /usr/src/debug/kdelibs-4.1.87/kio/kio/job.cpp:2416
#13 0x00007f4de53836fd in KIO::ListJob::qt_metacall (this=0x1180fb0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffff0292de0)
    at /usr/src/debug/kdelibs-4.1.87/build/kio/jobclasses.moc:747
#14 0x00007f4de4b12454 in QMetaObject::activate (sender=0xe12e80, from_signal_index=<value optimized out>, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3031
#15 0x00007f4de5428981 in KIO::SlaveInterface::dispatch (this=0xe12e80, _cmd=104, rawdata=<value optimized out>) at /usr/src/debug/kdelibs-4.1.87/kio/kio/slaveinterface.cpp:175
#16 0x00007f4de54265a2 in KIO::SlaveInterface::dispatch (this=0xe12e80) at /usr/src/debug/kdelibs-4.1.87/kio/kio/slaveinterface.cpp:91
#17 0x00007f4de5419a4e in KIO::Slave::gotInput (this=0xe12e80) at /usr/src/debug/kdelibs-4.1.87/kio/kio/slave.cpp:322
#18 0x00007f4de5419d58 in KIO::Slave::qt_metacall (this=0xe12e80, _c=QMetaObject::InvokeMetaMethod, _id=26606112, _a=0x7ffff0293150) at /usr/src/debug/kdelibs-4.1.87/build/kio/slave.moc:75
#19 0x00007f4de4b12454 in QMetaObject::activate (sender=0xe14440, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3031
#20 0x00007f4de5351341 in KIO::ConnectionPrivate::dequeue (this=0xe13820) at /usr/src/debug/kdelibs-4.1.87/kio/kio/connection.cpp:82
#21 0x00007f4de53519ea in KIO::Connection::qt_metacall (this=0xe14440, _c=QMetaObject::InvokeMetaMethod, _id=26606112, _a=0xf32380) at /usr/src/debug/kdelibs-4.1.87/build/kio/connection.moc:72
#22 0x00007f4de4b0d105 in QObject::event (this=0xe14440, e=0xff1370) at kernel/qobject.cpp:1155
#23 0x00007f4de38d41bd in QApplicationPrivate::notify_helper (this=0x63da10, receiver=0xe14440, e=0xff1370) at kernel/qapplication.cpp:3803
#24 0x00007f4de38dbf8a in QApplication::notify (this=0x7ffff0293cc0, receiver=0xe14440, e=0xff1370) at kernel/qapplication.cpp:3768
#25 0x00007f4de7c98afb in KApplication::notify (this=0x7ffff0293cc0, receiver=0xe14440, event=0xff1370) at /usr/src/debug/kdelibs-4.1.87/kdeui/kernel/kapplication.cpp:307
#26 0x00007f4de4afe091 in QCoreApplication::notifyInternal (this=0x7ffff0293cc0, receiver=0xe14440, event=0xff1370) at kernel/qcoreapplication.cpp:587
#27 0x00007f4de4afed3a in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x608390) at kernel/qcoreapplication.h:209
#28 0x00007f4de4b26863 in postEventSourceDispatch (s=<value optimized out>) at kernel/qcoreapplication.h:214
#29 0x00007f4dd9eb80db in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#30 0x00007f4dd9ebb8ad in ?? () from /usr/lib64/libglib-2.0.so.0
#31 0x00007f4dd9ebba6b in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#32 0x00007f4de4b264ef in QEventDispatcherGlib::processEvents (this=0x640c00, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:319
#33 0x00007f4de39649af in QGuiEventDispatcherGlib::processEvents (this=0x1498c50, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:198
#34 0x00007f4de4afc9a2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -265733424}) at kernel/qeventloop.cpp:143
#35 0x00007f4de4afcb2d in QEventLoop::exec (this=0x7ffff0293b10, flags={i = -265733344}) at kernel/qeventloop.cpp:194
#36 0x00007f4de4afeffd in QCoreApplication::exec () at kernel/qcoreapplication.cpp:845
#37 0x0000000000402deb in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdepim-4.1.87/kmail/main.cpp:146

*** Bug 180522 has been marked as a duplicate of this bug. ***

*** Bug 179825 has been marked as a duplicate of this bug. ***

*** This bug has been marked as a duplicate of bug 179765 ***