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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Proposal: prefetch tarballs in a batch
Date: Tue, 02 Sep 2014 23:04:28 +0200
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To: Nikita Karetnikov <nikita@karetnikov.org>
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ludo@gnu.org (Ludovic Court=C3=A8s) skribis:

>> Test end:
>>   result-kind: fail
>>   actual-value: #f
>>   actual-error: (srfi-34 #<condition &nix-protocol-error [message: "clos=
ing file descriptor 1599602736: Bad file descriptor" status: 1] 8a62798>)
>
> That one occurs many times.  I suspect this has to do with the daemon
> features enabled by c0412fedf, though I don=E2=80=99t see which one.

(4 months later...)

I reproduced this EBADF thing with a 2.6.35 kernel on x86_64, and the
culprit turned out to be vfork: commenting out uses of vfork in the
daemon solved the problem.

That sort of ringed a bell, and indeed, Nix commit f794465c (Nov. 2012!)
disabled vfork for similar reasons.

So guix-daemon no longer uses vfork.

Ludo=E2=80=99.