obj = <Process name='Process-5' parent=3357950 initial>
file = <_io.BytesIO object at 0x7f399e7d7bf0>, protocol = None

    def dump(obj, file, protocol=None):
        '''Replacement for pickle.dump() using ForkingPickler.'''

This may be related to the forkserver changes in Python 3.14, see [1]

Full log of the autopkgtest failure at [2].

Cheers,
Emilio

[1] https://docs.python.org/3/whatsnew/3.14.html
[2]
https://ci.debian.net/data/autopkgtest/testing/amd64/p/python-plac/72976962/log.gz

Hello,

Bug #1140949 in python-plac reported by you has been fixed in the
Git repository and is awaiting an upload. You can see the commit
message below and you can check the diff of the fix at:

https://salsa.debian.org/python-team/packages/python-plac/-/commit/a3a936a97e5f83d9cae9a2d77c5fbe772b61ea22

(this message was generated automatically)
-- 
Greetings

https://bugs.debian.org/1140949

We believe that the bug you reported is fixed in the latest version of
python-plac, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1140949@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael R. Crusoe <crusoe@debian.org> (supplier of updated python-plac package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 17 Aug 2026 13:39:16 +0300
Source: python-plac
Architecture: source
Version: 1.4.5-3
Distribution: unstable
Urgency: medium
Maintainer: Debian Python Team <team+python@tracker.debian.org>
Changed-By: Michael R. Crusoe <crusoe@debian.org>
Closes: 1140949
Changes:
 python-plac (1.4.5-3) unstable; urgency=medium
 .
   * Team upload.
   * Add patch for Python 3.14+ compat. Closes: #1140949).
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