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Date:      Wed, 27 Sep 2017 15:20:17 -0700
From:      list@museum.rain.com
To:        freebsd-questions@freebsd.org
Subject:   Re: Possible bug in tail(1)
Message-ID:  <20170927222017.GA80583@g5.umpquanet.com>
In-Reply-To: <20170927204526.GA78573@g5.umpquanet.com>
References:  <20170927195828.GA77592@g5.umpquanet.com> <20170927204526.GA78573@g5.umpquanet.com>

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I agree with Matthias that the issue arises when 'tail -r' is reading
from a pipe.

I looked at the GitHub mirror and downloaded a few src tarballs around
recent commits to tail.

Building tail from:

https://github.com/freebsd/freebsd/tree/97a2ca501c7e9f07a80339a88fbb5a46977ae428

does not manifest the bug.

However, tail built from:

https://github.com/freebsd/freebsd/tree/2fef72832029bcc228a527dd9c423ba34a7490e9

does.  IANAE, but it appears the bug may have crept in during:

https://reviews.freebsd.org/D9067


HTH,

Jim





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