> so this is not completely updated to focal-proposed?

No, that was just certain focal-proposed packages on a focal image (on a
pi4). Have now re-run with a full focal-proposed chroot (under the same
focal image), and that doesn't reproduce the issue:

(focal-arm64)root@ubuntu:~# cat /etc/apt/sources.list
deb http://ports.ubuntu.com/ubuntu-ports focal main restricted universe 
multiverse
deb-src http://ports.ubuntu.com/ubuntu-ports focal main restricted universe 
multiverse
deb http://ports.ubuntu.com/ubuntu-ports focal-updates main restricted universe 
multiverse
deb-src http://ports.ubuntu.com/ubuntu-ports focal-updates main restricted 
universe multiverse
deb http://ports.ubuntu.com/ubuntu-ports focal-proposed main restricted 
universe multiverse
deb-src http://ports.ubuntu.com/ubuntu-ports focal-proposed main restricted 
universe multiverse
deb http://ports.ubuntu.com/ubuntu-ports focal-security main restricted 
universe multiverse
deb-src http://ports.ubuntu.com/ubuntu-ports focal-security main restricted 
universe multiverse
(focal-arm64)root@ubuntu:~# dpkg -l | grep -e "libffi" -e "python3"
ii  libffi6:arm64                 3.2.1-9                     arm64        
Foreign Function Interface library runtime
ii  libffi7:arm64                 3.3-3                       arm64        
Foreign Function Interface library runtime
ii  libpython3-stdlib:arm64       3.7.5-1ubuntu1              arm64        
interactive high-level object-oriented language (default python3 version)
ii  libpython3.7-minimal:arm64    3.7.6-1ubuntu2              arm64        
Minimal subset of the Python language (version 3.7)
ii  libpython3.7-stdlib:arm64     3.7.6-1ubuntu2              arm64        
Interactive high-level object-oriented language (standard library, version 3.7)
ii  python3                       3.7.5-1ubuntu1              arm64        
interactive high-level object-oriented language (default python3 version)
ii  python3-cairo:arm64           1.16.2-2ubuntu1             arm64        
Python3 bindings for the Cairo vector graphics library
ii  python3-gi                    3.34.0-3build2              arm64        
Python 3 bindings for gobject-introspection libraries
ii  python3-gi-cairo              3.34.0-3build2              arm64        
Python 3 Cairo bindings for the GObject library
ii  python3-goocalendar           0.5-1                       all          
Calendar widget for GTK+ using PyGoocanvas (Python 3)
ii  python3-minimal               3.7.5-1ubuntu1              arm64        
minimal subset of the Python language (default python3 version)
ii  python3-pkg-resources         44.0.0-1                    all          
Package Discovery and Resource Access using pkg_resources
ii  python3.7                     3.7.6-1ubuntu2              arm64        
Interactive high-level object-oriented language (version 3.7)
ii  python3.7-minimal             3.7.6-1ubuntu2              arm64        
Minimal subset of the Python language (version 3.7)
(focal-arm64)root@ubuntu:~# python3 -c "import goocalendar; 
print(goocalendar.__version__)"
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused
0.5

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to libffi in Ubuntu.
https://bugs.launchpad.net/bugs/1859610

Title:
  python-gi/arm64 segfaults with the focal-proposed libffi version

Status in libffi package in Ubuntu:
  Fix Committed
Status in pygobject package in Ubuntu:
  New
Status in libffi source package in Focal:
  Fix Committed
Status in pygobject source package in Focal:
  New

Bug description:
  Testcase, on focal/arm64

  $ sudo apt install python3-goocalendar
  $ python3 -c "import goocalendar ; print(goocalendar.__version__)"

  -> works fine

  install the python3-gi package from focal-proposed it segfaults in
  libffi

  Program received signal SIGSEGV, Segmentation fault.
  0x0000000000000000 in ?? ()
  (gdb) bt
  #0  0x0000000000000000 in ?? ()
  #1  0x0000fffff7390ff8 in ffi_call_SYSV () at ../src/aarch64/sysv.S:114
  #2  0x0000fffff7390634 in ffi_call_int (cif=0xa12d78, fn=<optimized out>, 
      orig_rvalue=<optimized out>, avalue=0x0, closure=<optimized out>)

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