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[Anders Kaseorg <andersk@xxxxxxx>]

However, the problem seems to go away after locally recompiling krb5
1.12.1+dfsg-3ubuntu1 with gcc-4.9 4.9.1-3ubuntu2.

(This could still indicate any number of things, though.)

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

Title:
  krb5 database propagation enters infinite loop

Status in “krb5” package in Ubuntu:
  Confirmed

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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