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bug#19671: Raw binary data in build log from substitute-binary

From: Ludovic Courtès
Subject: bug#19671: Raw binary data in build log from substitute-binary
Date: Wed, 11 Feb 2015 10:41:55 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux)

Mark H Weaver <address@hidden> skribis:

> Mark H Weaver <address@hidden> writes:
>> While trying to install 'racket' using substitutes, several lines of the
>> form "substitute-binary: <binary garbage>" were output.  See the
>> attachment for the precise output, captured via Emacs' shell mode.
>> This was when running guix from git commit 2dfed64 on an i686 GSD
>> system.
> The same problem happened to me again, this time on git commit 710f3ce,
> while running 'guix system build'.  I've attached another transcript.
> The binary junk is immediately followed (with no intervening newline) by
> the message:
> http://hydra.gnu.org/2zadn0b2kljwlsyarr3j5rz44yi2pvs3.narinfo' failed: 502, 
> "Bad Gateway"
> This suggests that nginx had a problem fetching it from hydra-server on
> port 3000.  Repeating the same command worked properly.

I don’t see how the binary garbage could reach the stdout of ‘guix
substitute-binary’.  This happens when hydra.gnu.org is overloaded as
you suggest, so perhaps we have a connection closed unexpected or
something like that, but still.

Since this is the multithreaded ‘substitute-binary’, could there be
something fishy going on in wrt. threads?


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