Sam Eiderman e6f9e0b0f6 python: Don't call Python functions if Python interpreter has already gone. ...

If you've registered a callback in Python and the handle is implicitly
closed when the Python interpreter exits, then it can be that the
following happens:

 - Python interpreter is finalized.
 - guestfs_close is called
 - callback is invoked (eg. close event or to display a debug message)
 - Python code runs from the callback wrapper

This cause a segfault on shutdown.  Catch this case and stop the
callback from running (we lose the event but given the above sequence
of events there's not much we can do about it).

See:
https://bugzilla.redhat.com/show_bug.cgi?id=1773520#c7

2019-11-18 15:35:17 +00:00

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