[Bug 1988774] [NEW] timeout hangs when combined with sudo and watch

[Mikko Rantalainen]

Public bug reported:

Command 
$ timeout 15s watch -d date --iso=ns
works as expected and shows clock going forward for 15 seconds and then stops.

However, command
$ sudo timeout 15s watch -d date --iso=ns
hangs forever.

I'm not sure if this is a bug in sudo, timeout or watch but I'm
reporting this as timeout issue because I haven't experienced similar
problem unless I use timeout.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: coreutils 8.28-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-124.140~18.04.1-lowlatency 5.4.195
Uname: Linux 5.4.0-124-lowlatency x86_64
ApportVersion: 2.20.9-0ubuntu7.28
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Sep  5 18:41:42 2022
EcryptfsInUse: Yes
InstallationDate: Installed on 2019-01-05 (1338 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: coreutils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: coreutils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1988774

Title:
  timeout hangs when combined with sudo and watch

Status in coreutils package in Ubuntu:
  New

Bug description:
  Command 
  $ timeout 15s watch -d date --iso=ns
  works as expected and shows clock going forward for 15 seconds and then stops.

  However, command
  $ sudo timeout 15s watch -d date --iso=ns
  hangs forever.

  I'm not sure if this is a bug in sudo, timeout or watch but I'm
  reporting this as timeout issue because I haven't experienced similar
  problem unless I use timeout.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: coreutils 8.28-1ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-124.140~18.04.1-lowlatency 5.4.195
  Uname: Linux 5.4.0-124-lowlatency x86_64
  ApportVersion: 2.20.9-0ubuntu7.28
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Mon Sep  5 18:41:42 2022
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2019-01-05 (1338 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: coreutils
  UpgradeStatus: No upgrade log present (probably fresh install)

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