Message 300061 - Python tracker

Message300061

Author	methane
Recipients	benjamin.peterson, geeknik, methane
Date	2017-08-10.08:27:16
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1502353637.23.0.734242857846.issue31166@psf.upfronthosting.co.za>
In-reply-to

Content
As Benjamin commented, this is caused by mutating internal dict. PyType_Lookup() use "method cache", based on "tp_version_tag" in the type object. When you modify internal dict directly, namespace is changed without invalidating tp_version_tag. So cached pointer is used, and it's already deallocated. I don't know we should fix it or not. I don't have any idea fix this without any performance penalty.

Content

As Benjamin commented, this is caused by mutating internal dict.

PyType_Lookup() use "method cache", based on "tp_version_tag" in the type object.
When you modify internal dict directly, namespace is changed without
invalidating tp_version_tag.
So cached pointer is used, and it's already deallocated.

I don't know we should fix it or not.
I don't have any idea fix this without any performance penalty.

History
Date	User	Action	Args
2017-08-10 08:27:17	methane	set	recipients: + methane, benjamin.peterson, geeknik
2017-08-10 08:27:17	methane	set	messageid: <1502353637.23.0.734242857846.issue31166@psf.upfronthosting.co.za>
2017-08-10 08:27:17	methane	link	issue31166 messages
2017-08-10 08:27:16	methane	create