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

Previous Next

Full log

View this message in rfc822 format

From: Mathieu Othacehe <othacehe <at> gnu.org>
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: ludo <at> gnu.org, 55441 <at> debbugs.gnu.org, guix-sysadmin <at> gnu.org
Subject: bug#55441: [cuirass] hang in "In progress..."; runs out of pgsql connections
Date: Mon, 16 May 2022 09:32:43 +0200

Hello Maxim,

Thanks for the report, the root cause here is the evaluation
hanging. The Postgres slots starvation is just a symptom caused by
having many concurrent (stuck) evaluation processes using slots.

I noticed this error: https://ci.guix.gnu.org/eval/320682/log/raw.

The following lines can be caused by having a multi-threaded program:
(cuirass scripts evaluate) because of its par-for-each procedure, call
"primitive-fork" in open-bidirectional-pipe of (guix inferior).

--8<---------------cut here---------------start------------->8---
warning: call to primitive-fork while multiple threads are running;
         further behavior unspecified.  See "Processes" in the
         manual, for more information.
--8<---------------cut here---------------end--------------->8---

Not sure that it could cause the observed hang, Ludo what do you think?

Thanks,

Mathieu

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.