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

[Eirik Zakariassen]

I see this error too on Groovy, after installing Ubuntu studio and
trying to launch studio-controls.

➜  ~ studio-controls 
install path: /usr

Traceback (most recent call last):
  File "/usr/bin/studio-controls", line 1425, in <module>
    us = StudioControls()
  File "/usr/bin/studio-controls", line 431, in __init__
    jack.set_error_function(callback=self.jack_error)
  File "/usr/lib/python3/dist-packages/jack.py", line 2974, in set_error_function
    _set_error_or_info_function(callback, _lib.jack_set_error_function)
  File "/usr/lib/python3/dist-packages/jack.py", line 3013, in _set_error_or_info_function
    def callback_wrapper(msg):
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)
➜  ~

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to libffi in Ubuntu.
https://bugs.launchpad.net/bugs/1912535

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:
  Incomplete
Status in python-cffi source package in Groovy:
  Incomplete
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libffi/+bug/1912535/+subscriptions