GNU logs - #25402, boring messages

Message sent to sanvila@HIDDEN, debian.axhn@HIDDEN, bug-diffutils@HIDDEN:

Subject: bug#25402: Race condition in "colors" test
Resent-From: Santiago Vila <sanvila@HIDDEN>
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Date: Sun, 8 Jan 2017 23:35:08 +0100 (CET)
From: Santiago Vila <sanvila@HIDDEN>
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Hello.

The test suite for diffutils 3.5 has a tendency to fail in our ppc64el
architecture:

https://buildd.debian.org/status/logs.php?pkg=diffutils&ver=1%3A3.5-2&arch=ppc64el

According to Christoph Biedl (Cc:ed), there is a race condition here:

| mkfifo fifo
| printf '%*s-a' 1000000 > a
| head -c 10 < fifo > /dev/null &
+ diff --color=always ---presume-output-tty a b > fifo
| test $? = 141 || fail=1

Quoting Christoph:

> There is a race condition involved, it fails in about three of
> four attempts - but not at all if the test is run under strace.

> A "sleep 0.1" before the diff made the test pass in ten of ten
> attempts. So the reason might indeed be the head command hasn't opened
> fifo yet by the time diff tries to write to it.

For the Debian package, I am going to add a "sleep 1"
(slightly more portable), but Christoph points out that this
should not really be architecture specific.

Thanks.

Message sent:

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Santiago Vila <sanvila@HIDDEN>
Subject: bug#25402: Acknowledgement (Race condition in "colors" test)
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References: <alpine.DEB.2.20.1701082322140.581@HIDDEN>
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Reply-To: 25402 <at> debbugs.gnu.org
Date: Sun, 08 Jan 2017 22:37:02 +0000

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From: Paul Eggert <eggert@HIDDEN>
Subject: 25402 is same as 36488
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merge 25402 36488

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