From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#26976: On Hydra,
	offload crashes while trying to build linux-libre source
Date: Wed, 14 Jun 2017 22:10:59 +0200
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To: Mark H Weaver <mhw@netris.org>
Cc: Artyom Poptsov <poptsov.artyom@gmail.com>, 26976@debbugs.gnu.org, guix-sysadmin@gnu.org

(+ Cc: guix-sysadmin)

ludo@gnu.org (Ludovic Court=C3=A8s) skribis:

> I=E2=80=99ve pushed a workaround that seems to work (=E2=80=98guix copy=
=E2=80=99 commands that
> previously segfaulted on hydra.gnu.org no longer do):
>
>   https://git.savannah.gnu.org/cgit/guix.git/commit/?id=3D8e469b67f95cfe5=
b95405b503b8ee315fdf8ce66
>
> The idea is simply to explicitly close all the channel ports.  That way,
> when their finalizer gets called, it doesn=E2=80=99t 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 =E2=80=98node-eva=
l=E2=80=99 in
> Guile-SSH.  The patch changes =E2=80=98node-eval=E2=80=99 to explicitly c=
lose the RREPL
> channel upon completion.  (BTW, performance-wise, it may be best to
> avoid opening a new channel every time =E2=80=98node-eval=E2=80=99 is cal=
led.)
>
> That may be good enough for Guix, but of course that=E2=80=99s a workarou=
nd and
> not a proper fix.
>
> I=E2=80=99ll do some more testing and then maybe try switching hydra.gnu.=
org to
> Guile 2.2 again.

After some more testing, I=E2=80=99ve upgraded hydra.gnu.org to
/gnu/store/4p56wc3lmr177ffw0zkjdwcmm3cb18wx-guix-0.13.0-2.de9d8f0 (from
/gnu/store/cxmj38x6rh0ykq3d5dlqbxr5h1zgiiaf-guile2.0-guix-0.13.0-1.a6d728b).
So far so good, but let=E2=80=99s keep an eye on the ongoing builds.  We can
always roll back if it turns out my optimism was misplaced.

Ludo=E2=80=99.