Message 351040 - Python tracker

Message351040

Author	vstinner
Recipients	Mark.Shannon, christian.heimes, jdemeyer, lukasz.langa, pablogsal, petr.viktorin, pitrou, vstinner
Date	2019-09-02.21:38:36
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1567460316.65.0.266603535295.issue38006@roundup.psfhosted.org>
In-reply-to

Content
> Another issue is that the GC doesn't prevent the crash. Would it be possible to prevent the crash without changing the behavior (ex: still call weakref callbacks)? I discussed with Pablo and it doesn't seem possible to prevent to clear a function if it is indirectly used as a callback for a weak reference to a object which doesn't implement tp_traverse properly (like the CFFI type). The best that we can do is to detect the bug in C extension and emit a warning explaining the bug and suggesting a way to fix it.

Content

> Another issue is that the GC doesn't prevent the crash. Would it be possible to prevent the crash without changing the behavior (ex: still call weakref callbacks)?

I discussed with Pablo and it doesn't seem possible to prevent to clear a function if it is indirectly used as a callback for a weak reference to a object which doesn't implement tp_traverse properly (like the CFFI type).

The best that we can do is to detect the bug in C extension and emit a warning explaining the bug and suggesting a way to fix it.

History
Date	User	Action	Args
2019-09-02 21:38:36	vstinner	set	recipients: + vstinner, pitrou, christian.heimes, petr.viktorin, lukasz.langa, Mark.Shannon, jdemeyer, pablogsal
2019-09-02 21:38:36	vstinner	set	messageid: <1567460316.65.0.266603535295.issue38006@roundup.psfhosted.org>
2019-09-02 21:38:36	vstinner	link	issue38006 messages
2019-09-02 21:38:36	vstinner	create