Public bug reported:

If a gtk process blocks for I/O while a menu or volume slider is active,
then all input is completely disabled until the application becomes
responsive again. If that process happens to be blocking on I/O that
will never arrive (e.g. a disconnected network filesystem), then it
effectively disables the entire X session, forcing a
control+alt+backspace, even though all other applications are still
running fine.

** Affects: gtk+2.0 (Ubuntu)
     Importance: Undecided
         Status: New

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unkillable defunct program with popup menu disables all input
https://bugs.launchpad.net/bugs/200834
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