c++ - Segfault when <ctrl> + <leftflick> an unfocused window of a CygwinX QT app -

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when ctrl + leftclick unfocused window of qt application launched via cygwin x, noticing repeatable segfault. @ point i've trimmed off of application code , can still see same behavior while running simple qmainwindow holding few empty textedits. simple left click unfocused window (while holding ctrl) cause segfault ~50% of time.

has noticed similar behavior? i'm curious since don't seem see behavior documented or reported elsewhere.

note: i've noticed behavior applies modifier keys (alt, ctrl, shift, etc).

#0  0x00007f8429cf614b in ?? () /usr/local/lib/qt5/5.0.2/gcc_64/plugins/platforms/libqxcb.so #1  0x00007f8429cee501 in ?? () /usr/local/lib/qt5/5.0.2/gcc_64/plugins/platforms/libqxcb.so #2  0x00007f8429ce9e20 in ?? () /usr/local/lib/qt5/5.0.2/gcc_64/plugins/platforms/libqxcb.so #3  0x00007f8429ceb0cb in ?? () /usr/local/lib/qt5/5.0.2/gcc_64/plugins/platforms/libqxcb.so #4  0x00007f84306c955e in qobject::event(qevent*) () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5core.so.5 #5  0x00007f84311f25b4 in qapplicationprivate::notify_helper(qobject*, qevent*) () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5widgets.so.5 #6  0x00007f84311f5991 in qapplication::notify(qobject*, qevent*) () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5widgets.so.5 #7  0x00007f84306a27c4 in qcoreapplication::notifyinternal(qobject*, qevent*) () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5core.so.5 #8  0x00007f84306a4701 in qcoreapplicationprivate::sendpostedevents(qobject*, int, qthreaddata*) () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5core.so.5 #9  0x00007f84306ea0d3 in ?? () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5core.so.5 #10 0x00007f842e7e3f05 in g_main_context_dispatch () /lib/x86_64-linux-gnu/libglib-2.0.so.0 #11 0x00007f842e7e4248 in ?? () /lib/x86_64-linux-gnu/libglib-2.0.so.0 #12 0x00007f842e7e4304 in g_main_context_iteration () /lib/x86_64-linux-gnu/libglib-2.0.so.0 #13 0x00007f84306ea514 in qeventdispatcherglib::processevents(qflags<qeventloop::processeventsflag>) () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5core.so.5 #14 0x00007f84306a169b in qeventloop::exec(qflags<qeventloop::processeventsflag>) () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5core.so.5 #15 0x00007f84306a4c3e in qcoreapplication::exec() () /usr/local/lib/qt5/5.0.2/gcc_64/lib/libqt5core.so.5


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