[issue17206] Py_XDECREF() expands its argument multiple times

[Mark Shannon]

Mark Shannon added the comment:

I think blaming the crash in test_marshall
http://buildbot.python.org/all/builders/AMD64%20Windows7%20SP1%203.x/builds/2009/steps/test/logs/stdio
on the new macros (change aff41a6421c2) is correct.

It may be the proximate cause, but that doesn't make it the underlying one. The interpreter should be more resilient against minor changes to the amount of C stack used per call.

Can we get a full stack trace (for the C stack not the Python one) for the failure?

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