Comment 2 for bug 333944

backtrace of it at 100%

(gdb) where
#0 0x00007fc4c70aff4b in read () from /lib/libc.so.6
#1 0x00007fc4c3beee3d in ?? () from /usr/lib/libxcb.so.1
#2 0x00007fc4c3bef3c8 in xcb_poll_for_event () from /usr/lib/libxcb.so.1
#3 0x00007fc4c836ca3d in ?? () from /usr/lib/libX11.so.6
#4 0x00007fc4c836d345 in _XEventsQueued () from /usr/lib/libX11.so.6
#5 0x00007fc4c8355ed3 in XEventsQueued () from /usr/lib/libX11.so.6
#6 0x00007fc4c97e3eb7 in ?? () from /usr/lib/libQtGui.so.4
#7 0x00007fc4c4cae0a2 in IA__g_main_context_prepare (context=0x215dd20,
    priority=0x7fffd3852c84) at /build/buildd/glib2.0-2.20.0/glib/gmain.c:2134
#8 0x00007fc4c4cae4bf in g_main_context_iterate (context=0x215dd20, block=1,
    dispatch=1, self=<value optimized out>)
    at /build/buildd/glib2.0-2.20.0/glib/gmain.c:2428
#9 0x00007fc4c4cae93c in IA__g_main_context_iteration (context=0x215dd20,
    may_block=1) at /build/buildd/glib2.0-2.20.0/glib/gmain.c:2511
#10 0x00007fc4c8bcce6f in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#11 0x00007fc4c97e3c9f in ?? () from /usr/lib/libQtGui.so.4
#12 0x00007fc4c8ba2002 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#13 0x00007fc4c8ba23cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#14 0x00007fc4c8ba4694 in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#15 0x00007fc4cb42cfb7 in kdemain () from /usr/lib/libkdeinit4_kded4.so
---Type <return> to continue, or q <return> to quit---
#16 0x00007fc4c6ff65a6 in __libc_start_main () from /lib/libc.so.6
#17 0x0000000000400759 in _start ()
(gdb) where
#0 0x00007fc4c70aff4b in read () from /lib/libc.so.6
#1 0x00007fc4c3beee3d in ?? () from /usr/lib/libxcb.so.1
#2 0x00007fc4c3bef3c8 in xcb_poll_for_event () from /usr/lib/libxcb.so.1
#3 0x00007fc4c836ca3d in ?? () from /usr/lib/libX11.so.6
#4 0x00007fc4c836d345 in _XEventsQueued () from /usr/lib/libX11.so.6
#5 0x00007fc4c8355ed3 in XEventsQueued () from /usr/lib/libX11.so.6
#6 0x00007fc4c97e3eb7 in ?? () from /usr/lib/libQtGui.so.4
#7 0x00007fc4c4cae0a2 in IA__g_main_context_prepare (context=0x215dd20,
    priority=0x7fffd3852c84) at /build/buildd/glib2.0-2.20.0/glib/gmain.c:2134
#8 0x00007fc4c4cae4bf in g_main_context_iterate (context=0x215dd20, block=1,
    dispatch=1, self=<value optimized out>)
    at /build/buildd/glib2.0-2.20.0/glib/gmain.c:2428
#9 0x00007fc4c4cae93c in IA__g_main_context_iteration (context=0x215dd20,
    may_block=1) at /build/buildd/glib2.0-2.20.0/glib/gmain.c:2511
#10 0x00007fc4c8bcce6f in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#11 0x00007fc4c97e3c9f in ?? () from /usr/lib/libQtGui.so.4
#12 0x00007fc4c8ba2002 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#13 0x00007fc4c8ba23cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#14 0x00007fc4c8ba4694 in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#15 0x00007fc4cb42cfb7 in kdemain () from /usr/lib/libkdeinit4_kded4.so
---Type <return> to continue, or q <return> to quit---
#16 0x00007fc4c6ff65a6 in __libc_start_main () from /lib/libc.so.6
#17 0x0000000000400759 in _start ()
(gdb) info threads
  1 Thread 0x7fc4cb812750 (LWP 3190) 0x00007fc4c70aff4b in read ()
   from /lib/libc.so.6
(gdb)