I wonder if this could be the problem, on line 48 of QuPntr.c in libx11-6
LockDisplay(dpy);
It's way too easy to run into this problem when debugging a multi-
threaded application: it can stop in the middle of XQueryPointer when
another thread hits a completely unrelated breakpoint.
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X server freezes while the application is executing XQueryPointer
https://bugs.launchpad.net/bugs/400374
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