bug#46916: 28.0.50; pure_alloc(10424, ...) fails badly when pure space is exhausted

[Stefan Kangas]

Pip Cet <pipcet@gmail.com> writes:

> I have no objections to this report being closed, in case that's
> relevant: it's a clear bug but Eli appears to prefer not to fix it,
> and I can live with that. In fact, isn't that what WONTFIX is for?

Hmm, so I reviewed all this more carefully, and I think I agree that we
might as well fix this bug.

OT1H, the use-case you present is quite unusual, as almost no one will
call `purespace' outside of Emacs core development.

OTOH, it is a pretty bad behavior you observed, and the patch seems
minimal enough to me.  IIUC, outside of bootstrapping Emacs, we
won't/shouldn't call 'purespace' very often, so the code-path will not
be exercised in normal use (which means your patch won't hurt), and it
might save someones system from swapping to death.

Eli, I'm not sure if your previous reply was just intended to say "we
normally just increase the size of purespace", or if you also object to
installing this patch?