I cannot reproduce this. André, can you still get this?

Investigating this, I see that the KeyMonitor has a thread which watches
for all keyboard events with XNextEvent. If the Xserver shuts down,
XNextEvent will fail and calls _XIOError which calls any error handler
if defined (to quit). Qt installs an error handler qt_xio_errhandler to
print an error & quits (exit(1)). During this exit, I believe a thread
isn't stopping cleanly.

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https://bugs.launchpad.net/bugs/859596

Title:
  unity-2d-launcher crashed with SIGSEGV in exit()

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