Public bug reported:

I noticed this staring to happen in Xenial about two days ago. When
running sbuild (or now the buildd, too), the build breaks when trying to
compile a generated file. I traced the problem down to grep suddenly
acting weird. When not having any language set (or a non-UTF8 mode) it
will start printing some lines of a source file and then suddenly end
that by printing "Binary file ... matches".

With the attached file, the difference can be observed (running Xenial):

LANG=C grep -v xxx grant_table.h

and

LANG=C.UTF-8 grep -v xxx grant_table.h

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


** Tags: xenial

** Attachment added: "Testfile that causes the problem"
   
https://bugs.launchpad.net/bugs/1547466/+attachment/4575500/+files/grant_table.h

** Changed in: grep (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1547466

Title:
  grep switches into binary mode while processing a text file

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