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bug#41357: 28.0.50; GC may miss to mark calle safe register content

From: Paul Eggert
Subject: bug#41357: 28.0.50; GC may miss to mark calle safe register content
Date: Sun, 17 May 2020 09:46:23 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 
On 5/17/20 9:40 AM, Andrea Corallo wrote:
> I think this is a real bug that we have in the codebase (emacs-27
> included).

Thanks for all the detective work! Your analysis is correct and your patch looks
good. I've always been suspicious of that code, and it looks like you've
confirmed my suspicions.

The only question in my mind is whether to install the patch into the emacs-27
branch or the master branch. Given Eli's problems with stability in emacs-27
(see Bug#41321), I'm inclined to think the former, as the bug could explain the
problems Eli is observing.
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