GNU bug report logs - #75520
Circular code or data can hang Emacs unquittably

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From: Eli Zaretskii <eliz <at> gnu.org>
To: pipcet <at> protonmail.com, Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 75520 <at> debbugs.gnu.org, mattiase <at> acm.org, acorallo <at> gnu.org, monnier <at> iro.umontreal.ca
Subject: bug#75520: Circular code or data can hang Emacs unquittably
Date: Tue, 14 Jan 2025 18:32:40 +0200

> Date: Sun, 12 Jan 2025 21:57:55 -0800
> Cc: Eli Zaretskii <eliz <at> gnu.org>, Mattias Engdegård
>  <mattiase <at> acm.org>, Stefan Monnier <monnier <at> iro.umontreal.ca>,
>  Andrea Corallo <acorallo <at> gnu.org>, 75520 <at> debbugs.gnu.org
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> 
> On 2025-01-12 13:46, Pip Cet wrote:
> > This seems to be a common problem.  I did a quick git grep
> > 'while.*CONSP':
> 
> Yes, I did something similar in 2017; see, for example, commit 
> 14dd9101ec4838f75addf25bf6b06ef33f8a7e97, which fixes 'length', 
> 'member', 'memq', etc. I don't remember how carefully I audited the code 
> for the problem way back then. Either I missed several potential issues, 
> or the code has changed since then, or both.

Seems like we have a consensus here that this should be fixed.

But can we please have at least one test for every place where we fix
this kind of bug?

Thanks.

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