GNU bug report logs - #38753
27.0.60; cl--random-state uncontrolled growth due to bignums

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Package: emacs;

Reported by: Christopher Wellons <wellons <at> nullprogram.com>

Date: Thu, 26 Dec 2019 17:13:02 UTC

Severity: normal

Found in version 27.0.60

Done: Mattias Engdegård <mattiase <at> acm.org>

Bug is archived. No further changes may be made.

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From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: Pip Cet <pipcet <at> gmail.com>
Cc: Christopher Wellons <wellons <at> nullprogram.com>, 38753 <at> debbugs.gnu.org
Subject: bug#38753: 27.0.60; cl--random-state uncontrolled growth due to bignums
Date: Sun, 29 Dec 2019 14:48:25 +0100

Am So., 29. Dez. 2019 um 14:33 Uhr schrieb Pip Cet <pipcet <at> gmail.com>:
>
> On Thu, Dec 26, 2019 at 5:13 PM Christopher Wellons
> <wellons <at> nullprogram.com> wrote:
> > The cl-random generator was not written for bignums, so it misbehaves in
> > Emacs 27.
>
> Good catch.
>
> I might be wrong, but it looks to me like cl-random and Frandom are
> currently both limited to small integers (< 31 bits and fixnum range,
> respectively) and we don't have a random number generator that will do
> the right thing for
> (random 100000000000000000000000000000000000000000000)
>
> Any idea how easy it would be to fix either of them, or both?


I haven't tried it out, but mpz_urandomm should be what we need. We'd
need to find a replacement for mini-gmp though.
This bug report was last modified 5 years and 140 days ago.

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