Public bug reported:
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
tail -f /var/log/syslog
3) Press "Enter" 2 times
4) Notice the script process taking 100% CPU
This regression is rather new but I don't know which update introduced
it. Reverting util-linux/bsdutils to the previous version doesn't help
so maybe it's not even script's fault. tail/coreutils hasn't been update
in a long time so I'm not sure who's fault it is. I can reproduce the
problem with kernel 4.4.0-9-generic and 4.4.0-10-generic.
$ 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: Undecided
Status: New
** Tags: amd64 apport-bug package-from-proposed xenial
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https://bugs.launchpad.net/bugs/1553353
Title:
tail'ing a file in a script session hangs
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