Message 391095 - Python tracker

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Author	michaeldcurran
Recipients	David Heffernan, michaeldcurran, paul.moore, steve.dower, tim.golden, zach.ware
Date	2021-04-14.18:42:02
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1618425722.76.0.63005453469.issue38748@roundup.psfhosted.org>
In-reply-to

Content
I can also reproduce this. I will attach my own testcase below. So far I see it when the callback is __stdcall (WINFUNCTYPE) and it takes an larger than 4 bytes (E.g. a long long or a VARIANT), with one or more arguments preceeding it such that this argument is not aligned on a multiple of 8 bytes. For example arguments can be: * long, long long * long, long, long, long long But the corruption does not occur with something like: * long, long, long long My testcase uses long, long long to show the crash.

I can also reproduce this. I will attach my own testcase below.
So far I see it when the callback is __stdcall (WINFUNCTYPE) and it takes an larger than 4 bytes (E.g. a long long or a VARIANT), with one or more arguments preceeding it such that this argument is not aligned on a multiple of 8 bytes. 
For example arguments can be:
* long, long long
* long, long, long, long long
But the corruption does not occur with something like:
* long, long, long long
My testcase uses long, long long to show the crash.

History
Date	User	Action	Args
2021-04-14 18:42:02	michaeldcurran	set	recipients: + michaeldcurran, paul.moore, tim.golden, zach.ware, steve.dower, David Heffernan
2021-04-14 18:42:02	michaeldcurran	set	messageid: <1618425722.76.0.63005453469.issue38748@roundup.psfhosted.org>
2021-04-14 18:42:02	michaeldcurran	link	issue38748 messages
2021-04-14 18:42:02	michaeldcurran	create