From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Wingo <wingo@igalia.com>
Subject: bug#27476: libguile/memoize.c is not thread safe,
	so syntax parameter expansion is not thread-safe
Date: Wed, 09 May 2018 10:41:32 +0200
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	message of "Mon, 30 Apr 2018 23:39:05 +0200")
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: 27476@debbugs.gnu.org

Hi,

On Mon 30 Apr 2018 23:39, ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> So the problem, AIUI, is that psyntax evaluates syntax parameters using
> =E2=80=98primitive-eval=E2=80=99 (via =E2=80=98eval-local-transformer=E2=
=80=99), but memoization in
> (ice-9 eval) is not thread-safe, hence the random crashes.

Sorry I've been a bit AWOL here... if this diagnosis is correct, then
the problem is ultimately the memoization that needs to be thread-safe,
right?

Is the memoization you are referring to the "set!" in the "lazy" form in
ice-9/eval.scm ?  Or something else?  FWIW I would not think the "set!"
could be the issue, at least on x86, but who knows.

A