(gdb) bt
#0  0x00000039eac0b27c in pthread_cond_wait () from /lib/libpthread.so.0
#1  0x00007fc93e7d39d3 in wait (this=<value optimized out>, mutex=0x1dc21d0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x1dc21d0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007fc93e7d28dc in QThread::wait (this=<value optimized out>, time=18446744073709551615) at thread/qthread_unix.cpp:683
#4  0x00007fc93e8a11a0 in QFileSystemWatcher::~QFileSystemWatcher (this=0x1daf800, __in_chrg=<value optimized out>) at io/qfilesystemwatcher.cpp:440
#5  0x00007fc93e8e54d7 in QObjectPrivate::deleteChildren (this=0x1dc49d0) at kernel/qobject.cpp:1949
#6  0x00007fc93e8ee68b in QObject::~QObject (this=<value optimized out>, __in_chrg=<value optimized out>) at kernel/qobject.cpp:945
#7  0x00007fc93a5ce6a6 in Solid::Backends::Fstab::FstabWatcher::~FstabWatcher (this=0x1db9160, __in_chrg=<value optimized out>)
    at /tmp/portage/kde-base/kdelibs-4.6.0/work/kdelibs-4.6.0/solid/solid/backends/fstab/fstabwatcher.cpp:51
#8  0x00000039ea434bd5 in __run_exit_handlers () from /lib/libc.so.6
#9  0x00000039ea434c25 in exit () from /lib/libc.so.6
#10 0x00007fc93f5da5a8 in qt_xio_errhandler () at kernel/qapplication_x11.cpp:773
#11 0x00007fc94082bbee in _XIOError () from /usr/lib/libX11.so.6
#12 0x00007fc94082a6b8 in _XReply () from /usr/lib/libX11.so.6
#13 0x00007fc94080f462 in XGetSelectionOwner () from /usr/lib/libX11.so.6
#14 0x00007fc93f5f3eb6 in QClipboard::event (this=0x1c55b40, e=<value optimized out>) at kernel/qclipboard_x11.cpp:926
#15 0x00007fc93f5584dc in QApplicationPrivate::notify_helper (this=0x1c55b90, receiver=0x1c55b40, e=0x7fff6c9247a0) at kernel/qapplication.cpp:4445
#16 0x00007fc93f55fdc7 in QApplication::notify (this=0x7fff6c924870, receiver=0x1c55b40, e=0x7fff6c9247a0) at kernel/qapplication.cpp:4324
#17 0x00007fc93e8d252b in QCoreApplication::notifyInternal (this=0x7fff6c924870, receiver=0x1c55b40, event=0x7fff6c9247a0)
    at kernel/qcoreapplication.cpp:732
#18 0x00007fc93f5653db in sendEvent (this=0x7fff6c924870, __in_chrg=<value optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QApplication::~QApplication (this=0x7fff6c924870, __in_chrg=<value optimized out>) at kernel/qapplication.cpp:1079
#20 0x00007fc940b2d587 in kdemain (argc=<value optimized out>, argv=<value optimized out>)
    at /tmp/portage/kde-base/kdelibs-4.6.0/work/kdelibs-4.6.0/kded/kded.cpp:929
#21 0x00000039ea41ebbd in __libc_start_main () from /lib/libc.so.6
#22 0x0000000000400789 in _start ()