[Bug 1553353] [NEW] tail'ing a file in a script session hangs

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Steps to reproduce:

1) Start script session (same issue when script is saving to /dev/null)
script # or: script /dev/null
2) Tail a file
tailf /var/log/syslog
3) Press "Enter" 2 times
4) Notice the script process taking 100% CPU

This regression was introduced upstream by this commit:
https://git.kernel.org/cgit/utils/util-linux/util-
linux.git/commit/?id=54c6611d6f7b73609a5331f4d0bcf63c4af6429e

$ lsb_release -rd
Description:	Ubuntu Xenial Xerus (development branch)
Release:	16.04

$ apt-cache policy util-linux bsdutils coreutils
util-linux:
  Installed: 2.27.1-4ubuntu1
  Candidate: 2.27.1-4ubuntu1
  Version table:
 *** 2.27.1-4ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     2.27.1-3ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
bsdutils:
  Installed: 1:2.27.1-4ubuntu1
  Candidate: 1:2.27.1-4ubuntu1
  Version table:
 *** 1:2.27.1-4ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     1:2.27.1-3ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
coreutils:
  Installed: 8.25-2ubuntu2
  Candidate: 8.25-2ubuntu2
  Version table:
 *** 8.25-2ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: util-linux 2.27.1-4ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-10.25-generic 4.4.3
Uname: Linux 4.4.0-10-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Mar  4 15:14:15 2016
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: util-linux (Ubuntu)
     Importance: High
         Status: Confirmed

** Affects: util-linux (Ubuntu Xenial)
     Importance: High
         Status: Confirmed

** Affects: util-linux (Debian)
     Importance: Unknown
         Status: New


** Tags: amd64 apport-bug package-from-proposed patch regression-release xenial
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tail'ing a file in a script session hangs
https://bugs.launchpad.net/bugs/1553353
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