[PyQt] PyQt5 segfault on exit

[pwuertz]

I also get segmentation faults in about 1 out of 10 runs when closing a PyQt5
application on multiple machines/systems (Ubuntu 14.04 and 14.10) and
configurations (python2 and python3, pyqt5 from distribution and self
compiled). The test application is a single QQuickView window with a
Rectangle as root object.

Although I ran python3-dbg within gdb I don't seem to get any useful
information from the bt, but "info threads" points at QXcbEventReader, as
reported by Roger Leigh:
(gdb) info threads
  Id   Target Id         Frame 
  6    Thread 0x7fffd632d700 (LWP 3651) "QSGRenderThread"
pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  5    Thread 0x7fffd7dff700 (LWP 3650) "QThread" 0x00007ffff6b8bc6d in poll
()
    at ../sysdeps/unix/syscall-template.S:81
  4    Thread 0x7fffdce57700 (LWP 3649) "gdbus" 0x00007ffff6b8bc6d in poll
()
    at ../sysdeps/unix/syscall-template.S:81
  3    Thread 0x7fffdd86a700 (LWP 3648) "dconf worker" 0x00007ffff6b8bc6d in
poll () at ../sysdeps/unix/syscall-template.S:81
* 2    Thread 0x7fffe8ea9700 (LWP 3647) "QXcbEventReader" 0x00007fffec0d2729
in ?? ()
  1    Thread 0x7ffff7fd0740 (LWP 3643) "python3-dbg" 0x00007fffeff45340 in
??
    () from /usr/lib/nvidia-331/libnvidia-glcore.so.331.38




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