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This bug was fixed in the package libffi - 3.1~rc1+r3.0.13-12ubuntu0.1

---------------
libffi (3.1~rc1+r3.0.13-12ubuntu0.1) trusty; urgency=medium

  * Fix an AArch64 issue, taken from upstream:
    For any 1-16 byte structure not passed in registers, we weren't copying
    from the object to be passed, but from the array of objects.
    (LP: #1513958)

 -- dann frazier <dannf@xxxxxxxxxx>  Fri, 06 Nov 2015 13:33:54 -0700

** Changed in: libffi (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1513958

Title:
  arm64: failure with small objects passed on stack

Status in libffi package in Ubuntu:
  Fix Released
Status in libffi source package in Trusty:
  Fix Released

Bug description:
  [Impact]
  It isn't possible to build newer versions of python-cffi on trusty/arm64 because it's test cases will fail due to this bug. The thing that's biting me is that cloud-archive:liberty is incomplete on arm64, making key packages uninstallable on arm64 (e.g. nova-compute).

  Additionally, libffi is used by several languages in Ubuntu (python,
  ruby, haskell, etc), so this may also be causing issues in the closed
  set of Ubuntu/trusty packages. I don't have evidence either way.

  [TestCase]
  Build python-cffi_1.1.2-1ubuntu2 from wily on trusty/arm64. With unfixed libffi, the build will fail during dh_auto_test in the
  "TestFFI.test_struct_by_value" test case.

  [Regression Risk]
  The fix is in the aarch64-specific code, so there's a negligible risk of regression on other platforms. This exact fix was included in vivid and wily and no regressions have been triaged to libffi in those releases.

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