GNU logs - #34519, boring messages

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Subject: bug#34519: Test "colors" fails on Debian/ppc64el
Resent-From: Santiago Vila <sanvila@HIDDEN>
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Resent-Date: Mon, 18 Feb 2019 01:03:01 +0000
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To: 34519 <at> debbugs.gnu.org
Date: Mon, 18 Feb 2019 01:57:09 +0100 (CET)
From: Santiago Vila <sanvila@HIDDEN>
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Hello.

I've just uploaded diffutils 3.7 for Debian unstable (hopefully to be
part of Debian 10, since it contains only small fixes).

But there is a problem: The build in the ppc64el autobuilder failed:

https://buildd.debian.org/status/logs.php?pkg=diffutils&ver=1%3A3.7-1&arch=ppc64el

In tests/colors there was a race condition which I tried to fix
by adding a "sleep 1", like this:

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

It is possible that the "head" command takes (sometimes) more than one second to
complete on ppc64el?

Are there any other places in the test where a race condition could be
happening?

Thanks.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Santiago Vila <sanvila@HIDDEN>
Subject: bug#34519: Acknowledgement (Test "colors" fails on Debian/ppc64el)
Message-ID: <handler.34519.B.155045177526551.ack <at> debbugs.gnu.org>
References: <alpine.DEB.2.20.1902180147100.13056@HIDDEN>
X-Gnu-PR-Message: ack 34519
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Reply-To: 34519 <at> debbugs.gnu.org
Date: Mon, 18 Feb 2019 01:03:02 +0000

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34519: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D34519
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Message sent to bug-diffutils@HIDDEN:

Subject: bug#34519: [bug-diffutils] bug#34519: Test "colors" fails on Debian/ppc64el
Resent-From: Paul Eggert <eggert@HIDDEN>
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To: Santiago Vila <sanvila@HIDDEN>
Cc: 34519 <at> debbugs.gnu.org
References: <alpine.DEB.2.20.1902180147100.13056@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
Organization: UCLA Computer Science Department
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Date: Tue, 27 Aug 2019 15:06:21 -0700
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Santiago Vila wrote:
> In tests/colors there was a race condition which I tried to fix
> by adding a "sleep 1", like this:
> 
> mkfifo fifo
> printf '%1000000s-a' > a
> printf '%1000000s-b' > b
> head -c 10 < fifo > /dev/null &
> sleep 1
> diff --color=always ---presume-output-tty a b > fifo
> test $? = 141 || fail=1

Sorry, but what is the race condition, and why would adding 'sleep 1' help? The 
test should work regardless of whether 'diff' starts before 'head' does.

Are fifos broken on your system somehow?

Can you use 'strace -f' to see what syscalls are going wrong in 'head' and/or 
'diff'?

Message sent to bug-diffutils@HIDDEN:

Subject: bug#34519: [bug-diffutils] bug#34519: Test "colors" fails on Debian/ppc64el
Resent-From: Thiago Jung Bauermann <bauermann@HIDDEN>
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Cc: =?UTF-8?Q?Fr=C3=A9d=C3=A9ric?= Bonnard <frediz@HIDDEN>, Santiago Vila <sanvila@HIDDEN>, Paul Eggert <eggert@HIDDEN>
From: Thiago Jung Bauermann <bauermann@HIDDEN>
Date: Sat, 28 Aug 2021 12:29:17 -0300
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Hello,

Em ter=C3=A7a-feira, 27 de agosto de 2019, =C3=A0s 19:06:21 -03, Paul Egger=
t=20
escreveu:
> Santiago Vila wrote:
> > In tests/colors there was a race condition which I tried to fix
> > by adding a "sleep 1", like this:
> >=20
> > mkfifo fifo
> > printf '%1000000s-a' > a
> > printf '%1000000s-b' > b
> > head -c 10 < fifo > /dev/null &
> > sleep 1
> > diff --color=3Dalways ---presume-output-tty a b > fifo
> > test $? =3D 141 || fail=3D1
>=20
> Sorry, but what is the race condition, and why would adding 'sleep 1'
> help? The test should work regardless of whether 'diff' starts before
> 'head' does.
>=20
> Are fifos broken on your system somehow?
>=20
> Can you use 'strace -f' to see what syscalls are going wrong in 'head'
> and/or 'diff'?

I still see this problem on powerpc64le-linux with version 3.8.

There was a great analysis of the problem made by Fr=C3=A9d=C3=A9ric Bonnar=
d (whom I=20
took the liberty of copying on this message. I hope it=E2=80=99s ok), and a=
lso a=20
tentative fix by him which would need to be assessed by someone more=20
knowledgeable of the diffutils code:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D922552#19

In short: it=E2=80=99s not a problem in the test. It=E2=80=99s a bug in the=
 signal handling=20
code that was added to support the =E2=80=98--color=E2=80=99 option.

=46or some reason, it=E2=80=99s particularly easy to hit on powerpc64le-lin=
ux. With=20
=46r=C3=A9d=C3=A9ric=E2=80=99s patch I can=E2=80=99t hit it anymore.

=2D-=20
Thanks,
Thiago

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merge 34519 36488

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Subject: 25402 is same as 36488
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merge 25402 36488

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