GNU bug report logs - #55441
Use of 'primitive-fork' in (guix inferior) leads to hangs in 'cuirass evaluate'

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Message #43 received at 55441 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Mathieu Othacehe <othacehe <at> gnu.org>
Cc: 55441 <at> debbugs.gnu.org, Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Subject: Re: bug#55441: [cuirass] hang in "In progress..."; runs out of
 pgsql connections
Date: Wed, 25 May 2022 18:32:05 +0200

Ludovic Courtès <ludo <at> gnu.org> skribis:

> Notice there’s a single thread: it very much looks like the random
> results one gets when forking a multithreaded process (in this case,
> this one thread is a finalization thread, except it’s running in a
> process that doesn’t actually have the other Guile threads).  The
> fork+threads problem is already manifesting, after all.

An update: The ‘with-database’ used by (cuirass scripts evaluate),
creates threads unconditionally and leaves them around when its body has
exited.  So there’s currently no way in (cuirass scripts evaluate) to
arrange so that ‘open-inferior’ is called in a single-threaded context
(I tried that in ‘wip-bug-55441’).

Bummer.  Looks like we’re left with unpleasant solutions, such as
writing bindings for ‘posix_spawn’ and using that in (guix inferior).

Mathieu, any ideas?

Ludo’.

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