[Bug 1912535] Re: [SRU] python-cffi and libffi in Groovy need a no-change rebuild

[Stefano Rivera]

First: How do we reproduce the error? That'd be the best way to dig
deeper.

Second: libffi doesn't build against cffi.

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Title:
  [SRU] python-cffi and libffi in Groovy need a no-change rebuild

Status in libffi package in Ubuntu:
  Fix Released
Status in python-cffi package in Ubuntu:
  Fix Released
Status in libffi source package in Groovy:
  New
Status in python-cffi source package in Groovy:
  New
Status in libffi source package in Hirsute:
  Fix Released
Status in python-cffi source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

   * Users of studio-controls have been reporting bugs against studio-
  controls upstream on Github. For reference, see
  https://github.com/ovenwerks/studio-controls/issues/43

   * Per the bug report, the following error is being thrown:
  SystemError: ffi_prep_closure(): bad user_data (it seems that the
  version of the libffi library seen at runtime is different from the
  'ffi.h' file seen at compile-time)

   * Based on this error, and based on the build time of python-cffi and
  libffi in relation to cffi, it appears as though python-cffi and
  libffi were built on an older version of cffi. This explains the
  error.

  [Test Case]

   * A certain number of users have reported that simply running studio-
  controls causes this error.

  [Where problems could occur]

   * Since this is a no-change rebuild being requested, the possibility
  of breakage is slim to none. We are introducing no new changes here,
  but rather, resolving a regression that happened as a result of a
  newer version of cffi being introduced without a rebuild of
  dependencies.

   * If any problems happen, it would be a result of applications using
  python-cffi and expecting this bug with built-in workarounds. I can't
  imagine such a case exists, so this is just a stretch.

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