[Bug 1708635] Re: Valgrind reports " Uninitialised value was created by a stack allocation" in __uuid_generate_random

[Alan Griffiths]

Looking at the util-linux source it seems that this could arise if:

1. opening /dev/urandom succeeds; and,
2. a subsequent read() fails

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https://bugs.launchpad.net/bugs/1708635

Title:
  Valgrind reports " Uninitialised value was created by a stack
  allocation" in  __uuid_generate_random

Status in util-linux package in Ubuntu:
  New

Bug description:
  This has shown up in lp:mir CI on Artful amd64 (and no other
  architecture or series we're using)

  For example:

  https://mir-jenkins.ubuntu.com/job/build-2-binpkg-
  mir/arch=amd64,compiler=gcc,platform=mesa,release=artful/4870/consoleFull

  Marking the memory with VALGRIND_MAKE_MEM_DEFINED() suppresses the
  error.

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