GNU bug report logs - #34519
Test "colors" fails on Debian/ppc64el

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Message #8 received at 34519 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Santiago Vila <sanvila <at> unex.es>
Cc: 34519 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#34519: Test "colors" fails on Debian/ppc64el
Date: Tue, 27 Aug 2019 15:06:21 -0700

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'?

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