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bug#26976: On Hydra, offload crashes while trying to build linux-libre s

From: Ludovic Courtès
Subject: bug#26976: On Hydra, offload crashes while trying to build linux-libre source
Date: Wed, 14 Jun 2017 22:10:59 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

(+ Cc: guix-sysadmin)

address@hidden (Ludovic Courtès) skribis:

> I’ve pushed a workaround that seems to work (‘guix copy’ commands that
> previously segfaulted on hydra.gnu.org no longer do):
> https://git.savannah.gnu.org/cgit/guix.git/commit/?id=8e469b67f95cfe5b95405b503b8ee315fdf8ce66
> The idea is simply to explicitly close all the channel ports.  That way,
> when their finalizer gets called, it doesn’t invoke libssh code.
> (guix build offload) and (guix ssh) already explicitly close all the
> channel ports they open, so I found that the culprit is ‘node-eval’ in
> Guile-SSH.  The patch changes ‘node-eval’ to explicitly close the RREPL
> channel upon completion.  (BTW, performance-wise, it may be best to
> avoid opening a new channel every time ‘node-eval’ is called.)
> That may be good enough for Guix, but of course that’s a workaround and
> not a proper fix.
> I’ll do some more testing and then maybe try switching hydra.gnu.org to
> Guile 2.2 again.

After some more testing, I’ve upgraded hydra.gnu.org to
/gnu/store/4p56wc3lmr177ffw0zkjdwcmm3cb18wx-guix-0.13.0-2.de9d8f0 (from
So far so good, but let’s keep an eye on the ongoing builds.  We can
always roll back if it turns out my optimism was misplaced.


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