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bug#33946: tail -f stops abruptly in AIX when piped.

From: Bernhard Voelker
Subject: bug#33946: tail -f stops abruptly in AIX when piped.
Date: Tue, 15 Jan 2019 08:54:29 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3

On 1/13/19 4:31 AM, Pádraig Brady wrote:
> Thanks for testing. Pushed at:
> https://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=d5ab4cb

> -timeout 10 tail -f $mode $fastpoll out | sleep .1 || fail=1
> +(returns_ 124 timeout 10 tail -n2 -f $mode $fastpoll out && touch timed_out) 
> |
> + sed 2q > out2
> +test -e timed_out && fail=1
> +compare exp out2 || fail=1

I see the 'timed_out' file when running the test on openSUSE's build service
for Linux x86_64, and can reproduce when running that in the local 'osc' build
environment (chroot-based).

I'm not sure what's the problem though, but could this be related to
how we fixed 'tests/misc/seq-epipe.sh' a while ago in v8.25-42-g383e4b2ce?

BTW: in the 2nd iteration, the test doesn't delete 'timed_out',
so will always set fail=1 if the 1st one failed.

Have a nice day,

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