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[Benjamin Kaduk <1347147@xxxxxxxxxxxxxxxxxx>]

The workaround suggested
(https://github.com/krb5/krb5/commit/26d8744129) is still valid, and
appears on upstream's 1.12 release branch already (as
https://github.com/krb5/krb5/commit/c7bb9278ad12c9).  It will appear in
the 1.12.2 release.  Furthermore, I have applied it to the Debian
packaging as http://anonscm.debian.org/cgit/pkg-k5-afs/debian-
krb5-2013.git/commit/?id=3d3bf0c075af62f278b6 (though it has not yet
been uploaded to Debian proper).  This workaround should not introduce
any regressions.

I should also note that, if I understand correctly, we expect a no-
change rebuild of krb5 using the gcc currently in utopic to also be a
valid workaround.  However, the gcc in trusty is still expected to
produce krb5 packages which exhibit this bug.

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https://bugs.launchpad.net/bugs/1347147

Title:
  krb5 database propagation enters infinite loop

Status in The GNU Compiler Collection:
  Unknown
Status in Network Authentication System:
  Unknown
Status in “gcc-4.8” package in Ubuntu:
  New
Status in “krb5” package in Ubuntu:
  Triaged

Bug description:
  In some conditions, propagating a kerberos database to a slave KDC server can stall.
  This is due to a misoptimization by gcc 4.8 of the CIRCLEQ famliy of macros, apparently due to overzealous strict aliasing deductions.

  One case of this stall is reported at
  http://mailman.mit.edu/pipermail/kerberos/2014-July/020007.html (and
  the rest of the thread), and there is an entry in the upstream
  bugtracker at http://krbdev.mit.edu/rt/Ticket/Display.html?id=7860 .

  gcc 4.9 (as used in Debian unstable at present) is not believed to
  induce this problem.  Upstream has patched their code to use the TAILQ
  family of macros instead, as a workaround, but that workaround has not
  yet appeared in an upstream release:
  https://github.com/krb5/krb5/commit/26d8744129

  Because of the different compiler versions used on Debian and Ubuntu,
  I am filing this as an Ubuntu-specific bug.

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