(gdb) thread apply all bt

Thread 3 (Thread 0x7f8dd6bac700 (LWP 3018)):
#0  0x00007f8dece36883 in select () from /lib64/libc.so.6
#1  0x00007f8dee4e1ebb in QProcessManager::run (this=0x7f8dee84c860) at io/qprocess_unix.cpp:245
#2  0x00007f8dee4093ca in QThreadPrivate::start (arg=0x7f8dee84c860) at thread/qthread_unix.cpp:320
#3  0x00007f8de0806893 in ?? () from //usr/lib64/opengl/nvidia/lib/libGL.so.1
#4  0x00007f8dee173dba in start_thread () from /lib64/libpthread.so.0
#5  0x00007f8dece3d02d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f8dd61a2700 (LWP 3024)):
#0  0x00007f8dece34293 in poll () from /lib64/libc.so.6
#1  0x00007f8de9c15361 in g_main_context_iterate () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f8de9c1579e in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f8dee53871e in QEventDispatcherGlib::processEvents (this=0xd60350, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#4  0x00007f8dee5079f2 in QEventLoop::processEvents (this=<value optimized out>, flags=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece or DW_OP_bit_piece.
) at kernel/qeventloop.cpp:149
#5  0x00007f8dee507dbd in QEventLoop::exec (this=0x7f8dd61a1d20, flags=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece or DW_OP_bit_piece.
) at kernel/qeventloop.cpp:201
#6  0x00007f8dee4066f8 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:492
#7  0x00007f8dee4e52b5 in QInotifyFileSystemWatcherEngine::run (this=0xd592c0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f8dee4093ca in QThreadPrivate::start (arg=0xd592c0) at thread/qthread_unix.cpp:320
#9  0x00007f8de0806893 in ?? () from //usr/lib64/opengl/nvidia/lib/libGL.so.1
#10 0x00007f8dee173dba in start_thread () from /lib64/libpthread.so.0
#11 0x00007f8dece3d02d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f8def928760 (LWP 3011)):
#0  0x00007f8dee17885c in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007f8dee40a093 in wait (this=<value optimized out>, mutex=0xd95da0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0xd95da0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f8dee408f9c in QThread::wait (this=<value optimized out>, time=18446744073709551615) at thread/qthread_unix.cpp:722
#4  0x00007f8dee4d7940 in QFileSystemWatcher::~QFileSystemWatcher (this=0xd5ce00, __in_chrg=<value optimized out>) at io/qfilesystemwatcher.cpp:446
#5  0x00007f8dee51be57 in QObjectPrivate::deleteChildren (this=0xd52e70) at kernel/qobject.cpp:1955
#6  0x00007f8dee52500b in QObject::~QObject (this=<value optimized out>, __in_chrg=<value optimized out>) at kernel/qobject.cpp:946
#7  0x00007f8de6dcda66 in Solid::Backends::Fstab::FstabWatcher::~FstabWatcher (this=0xd73060, __in_chrg=<value optimized out>)
    at /tmp/portage/kde-base/kdelibs-4.6.3-r1/work/kdelibs-4.6.3/solid/solid/backends/fstab/fstabwatcher.cpp:51
---Type <return> to continue, or q <return> to quit---
#8  0x00007f8decda02f5 in __run_exit_handlers () from /lib64/libc.so.6
#9  0x00007f8decda0355 in exit () from /lib64/libc.so.6
#10 0x00007f8ded636148 in qt_xio_errhandler () at kernel/qapplication_x11.cpp:772
#11 0x00007f8deed8cc0e in _XIOError () from /usr/lib64/libX11.so.6
#12 0x00007f8deed8b6f8 in _XReply () from /usr/lib64/libX11.so.6
#13 0x00007f8deed70482 in XGetSelectionOwner () from /usr/lib64/libX11.so.6
#14 0x00007f8ded64fb6b in QClipboard::event (this=0xc4ab70, e=<value optimized out>) at kernel/qclipboard_x11.cpp:922
#15 0x00007f8ded5b32fc in QApplicationPrivate::notify_helper (this=0xc4abc0, receiver=0xc4ab70, e=0x7fff66580440) at kernel/qapplication.cpp:4462
#16 0x00007f8ded5bb627 in QApplication::notify (this=0x7fff66580510, receiver=0xc4ab70, e=0x7fff66580440) at kernel/qapplication.cpp:4341
#17 0x00007f8dee508deb in QCoreApplication::notifyInternal (this=0x7fff66580510, receiver=0xc4ab70, event=0x7fff66580440) at kernel/qcoreapplication.cpp:731
#18 0x00007f8ded5b955b in sendEvent (this=0x7fff66580510, __in_chrg=<value optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QApplication::~QApplication (this=0x7fff66580510, __in_chrg=<value optimized out>) at kernel/qapplication.cpp:1088
#20 0x00007f8ddd9bb587 in kdemain (argc=<value optimized out>, argv=<value optimized out>)
    at /tmp/portage/kde-base/kdelibs-4.6.3-r1/work/kdelibs-4.6.3/kded/kded.cpp:929
#21 0x0000000000407a92 in launch (argc=1, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=<value optimized out>, 
    envs=<value optimized out>, reset_env=false, tty=0x0, avoid_loops=false, startup_id_str=0x40c19c "0")
    at /tmp/portage/kde-base/kdelibs-4.6.3-r1/work/kdelibs-4.6.3/kinit/kinit.cpp:734
#22 0x00000000004098ab in main (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>)
    at /tmp/portage/kde-base/kdelibs-4.6.3-r1/work/kdelibs-4.6.3/kinit/kinit.cpp:1849