Possible bug in tail(1)

[list at museum.rain.com]

On Wed, Sep 27, 2017 at 12:58:28PM -0700, list at museum.rain.com wrote:
> #!/usr/bin/env bash
> 
> cat << EOF > foo
> 1
> 2
> 3
> 
> EOF
> 
> echo "--"
> cat foo
> echo "--"
> tail -r foo
> echo "--"
> tail -r foo | tail -r
> echo "--"


Here is a simpler test case:

$ printf '\n1\n' | tail -r