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Re: When should ralloc.c be used?

From: Eli Zaretskii
Subject: Re: When should ralloc.c be used?
Date: Fri, 28 Oct 2016 10:40:37 +0300

> From: address@hidden (Jérémie Courrèges-Anglas)
> Cc: Paul Eggert <address@hidden>, address@hidden
> Date: Fri, 28 Oct 2016 08:19:48 +0200
> > Yes, exactly.  And since most people at least here use Emacs on
> > GNU/Linux, the nasty problems due to ralloc.c are popping up much
> > faster and more frequently than they did when only *BSD and Windows
> > used ralloc.c.
> I'm a bit surprised that such issues happen on recent glibc systems.
> Emacs has been using ralloc on OpenBSD since years, and seems to be
> pretty stable.  Granted, memory corruption bugs can depend on many
> parameters, but still...

I guess your usage patterns side-step the problematic code.  E.g., if
the resulting memory footprint is stable (i.e. never grows too much
too fast), ralloc will not need to relocate buffer text too
frequently, so you won't bump into these problems.  And some of those
problems appeared only recently: e.g., EWW, which triggers the problem
when it calls libxml2, is a 25.1 addition.

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