Thread 2 (Thread 0xb40c6b40 (LWP 17755)):
#0  0xb7713424 in __kernel_vsyscall ()
#1  0xb6228dfb in poll () at ../sysdeps/unix/syscall-template.S:81
#2  0xb44687a8 in poll (__timeout=-1, __nfds=1, __fds=0xb40c61fc) at /usr/include/i386-linux-gnu/bits/poll2.h:46
#3  _xcb_conn_wait (c=c@entry=0x9df1b98, cond=cond@entry=0x9df1bbc, vector=vector@entry=0x0, count=count@entry=0x0)
    at ../../src/xcb_conn.c:447
#4  0xb446a794 in xcb_wait_for_event (c=0x9df1b98) at ../../src/xcb_in.c:622
#5  0xb42a5588 in QXcbEventReader::run (this=0x9dfb7b0) at qxcbconnection.cpp:1046
#6  0xb6568812 in QThreadPrivate::start (arg=0x9dfb7b0) at thread/qthread_unix.cpp:345
#7  0xb6454efb in start_thread (arg=0xb40c6b40) at pthread_create.c:312
#8  0xb6236f5e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:129

Thread 1 (Thread 0xb43dd700 (LWP 17754)):
#0  0xb7713424 in __kernel_vsyscall ()
#1  0xb6458c4b in pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:187
#2  0xb44d7273 in _XConditionWait (cv=0x9df1ae8, mutex=0x9df70d8) at ../../src/locking.c:353
#3  0xb44e9d16 in _XReply (dpy=dpy@entry=0x9df08f8, rep=rep@entry=0xbffed1d0, extra=extra@entry=0,
    discard=discard@entry=1) at ../../src/xcb_io.c:596
#4  0xb44ec7c8 in _XSeqSyncFunction (dpy=0x9df08f8) at ../../src/XlibInt.c:232
#5  0xb44ec017 in _XError (dpy=dpy@entry=0x9df08f8, rep=rep@entry=0xb3703500) at ../../src/XlibInt.c:1465
#6  0xb44e8d06 in handle_error (dpy=dpy@entry=0x9df08f8, err=0xb3703500, in_XReply=in_XReply@entry=1)
    at ../../src/xcb_io.c:213
#7  0xb44e8dbe in handle_response (dpy=dpy@entry=0x9df08f8, response=0xb3703500, in_XReply=in_XReply@entry=1)
    at ../../src/xcb_io.c:325
#8  0xb44e9ddc in _XReply (dpy=dpy@entry=0x9df08f8, rep=rep@entry=0xbffed3c0, extra=extra@entry=0,
    discard=discard@entry=0) at ../../src/xcb_io.c:648
#9  0xb4279880 in XIQueryDevice (dpy=0x9df08f8, deviceid=4, ndevices_return=0xbffed420) at ../../src/XIQueryDevice.c:60
#10 0xb42cfbd8 in QXcbConnection::handleEnterEvent (this=0x9df0620) at qxcbconnection_xi2.cpp:598
#11 0xb42c1620 in QXcbWindow::handleEnterNotifyEvent (this=0x9e579b0, event=0xb37033e0) at qxcbwindow.cpp:1886
#12 0xb42a4824 in QXcbConnection::handleXcbEvent (this=0x9df0620, event=0xb37033e0) at qxcbconnection.cpp:861
#13 0xb42a5dc8 in QXcbConnection::processXcbEvents (this=0x9df0620) at qxcbconnection.cpp:1244
#14 0xb42d9023 in QXcbConnection::qt_static_metacall (_o=0x9df0620, _c=QMetaObject::InvokeMetaMethod, _id=2,
    _a=0xb3703608) at .moc/moc_qxcbconnection.cpp:190
#15 0xb679a178 in QMetaCallEvent::placeMetaCall (this=0xb3703658, object=0x9df0620) at kernel/qobject.cpp:487
#16 0xb679b0b8 in QObject::event (this=0x9df0620, e=0xb3703658) at kernel/qobject.cpp:1241
#17 0xb710e00c in QApplicationPrivate::notify_helper (this=0x9dea800, receiver=0x9df0620, e=0xb3703658)
    at kernel/qapplication.cpp:3499
#18 0xb710b92a in QApplication::notify (this=0xbffee038, receiver=0x9df0620, e=0xb3703658)
    at kernel/qapplication.cpp:2952
#19 0xb6763a1a in QCoreApplication::notifyInternal (this=0xbffee038, receiver=0x9df0620, event=0xb3703658)
    at kernel/qcoreapplication.cpp:935
#20 0xb676764c in QCoreApplication::sendEvent (receiver=0x9df0620, event=0xb3703658)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:237
#21 0xb6764c10 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9dea288)
    at kernel/qcoreapplication.cpp:1539
#22 0xb67646b1 in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1397
#23 0xb67d1474 in postEventSourceDispatch (s=0x9e077e8) at kernel/qeventdispatcher_glib.cpp:279
#24 0xb4672313 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#25 0xb4672598 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#26 0xb4672658 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#27 0xb67d1ba3 in QEventDispatcherGlib::processEvents (this=0x9e077d8, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#28 0xb42da199 in QPAEventDispatcherGlib::processEvents (this=0x9e077d8, flags=...)
    at eventdispatchers/qeventdispatcher_glib.cpp:123
#29 0xb676075d in QEventLoop::processEvents (this=0xbffedf50, flags=...) at kernel/qeventloop.cpp:136
#30 0xb6760a0f in QEventLoop::exec (this=0xbffedf50, flags=...) at kernel/qeventloop.cpp:212
#31 0xb6764112 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#32 0xb6b0faaa in QGuiApplication::exec () at kernel/qguiapplication.cpp:1483
#33 0xb710b197 in QApplication::exec () at kernel/qapplication.cpp:2744
#34 0x0804ddb1 in main (argc=1, argv=0xbffee104) at main.cpp:53