[Bug 1794826] [NEW] Nonsense (and/or undocumented) "clean:" before filename in grep output

[teo1978]

Public bug reported:

It has started happening to me recently, than when I do:

> grep -R something

besides the normal expected output which is of the form:
  filename: match
  filename: match
  ...

I also get some lines like this:
  clean:filename: match

where the word "clean" appears literally.

The matches that are shown in this form also appear in the normal form
without the "clean:" prefix, so in total they show up twice.

And I have checked that I have no files whose filename actually starts
with "clean:"

I have checked the manpage for grep and there's no occurrence of the
word "clean", so if that "clean:" is supposed to actually mean something
(besides being counterintuitive and being a shitty inconsistent format,
and besides the fact it wouldn't make sense to show the matches twice),
it's not documented.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: grep 2.25-1~16.04.1
ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140
Uname: Linux 4.4.0-135-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Sep 27 17:43:46 2018
InstallationDate: Installed on 2013-10-11 (1811 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: grep
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug third-party-packages xenial

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https://bugs.launchpad.net/bugs/1794826

Title:
  Nonsense (and/or undocumented) "clean:" before filename in grep output

Status in grep package in Ubuntu:
  New

Bug description:
  It has started happening to me recently, than when I do:

  > grep -R something

  besides the normal expected output which is of the form:
    filename: match
    filename: match
    ...

  I also get some lines like this:
    clean:filename: match

  where the word "clean" appears literally.

  The matches that are shown in this form also appear in the normal form
  without the "clean:" prefix, so in total they show up twice.

  And I have checked that I have no files whose filename actually starts
  with "clean:"

  I have checked the manpage for grep and there's no occurrence of the
  word "clean", so if that "clean:" is supposed to actually mean
  something (besides being counterintuitive and being a shitty
  inconsistent format, and besides the fact it wouldn't make sense to
  show the matches twice), it's not documented.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: grep 2.25-1~16.04.1
  ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140
  Uname: Linux 4.4.0-135-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Sep 27 17:43:46 2018
  InstallationDate: Installed on 2013-10-11 (1811 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  SourcePackage: grep
  UpgradeStatus: No upgrade log present (probably fresh install)

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