Hey.

Since upgrading to 3.57.0-2, whenever I lock cinnamon via cinnamon-screensaver,
and then unlock it,... it crashes after entering the password, apparently
showing some built-in fallback (which still keeps X locked), and instructs one
to go to th kernel console, log in and unlock via cinnamon-unlock-desktop).

At the same time I get a segfault:
Aug 07 16:51:43 heisenberg kernel: cs-backup-locke[2624494]: segfault at 0 ip 00007fa1d3c600cd sp 00007fff6fea5008 error 4 in libgio-2.0.so.0.8800.3[580cd,7fa1d3c46000+122000] likely on CPU 8 (core 16, socket 0)
Aug 07 16:51:43 heisenberg kernel: Code: 01 00 00 48 8d 35 a9 b8 10 00 48 8d 3d b0 ae 10 00 e8 e7 74 fe ff 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 85 ff 74 0a 48 8b 47 18 <8b> 10 85 d2 74 05 c3 0f 1f 40 00 41 57 41 56 55 53 48 89 fb 48 83


Downgrading python3-gi to 3.56.3-2 fixes the issue.

Thanks,
Chris.

Control: severity -1 serious
Control: retitle -1 python3-gi: Triggers crash in cinnamon-screensaver

Thank you for taking the time to report this issue promptly. Please
additionally report this issue to the cinnamon maintainers in Debian
and upstream.

We were aware of one crash triggered by the new pygobject version, but
it was determined to be a downstream issue. Maybe the Cinnamon bug has
a similar cause.
https://gitlab.gnome.org/GNOME/pygobject/-/work_items/764

We can temporarily hold the new pygobject in Unstable to allow
maintainers time to fix the issue so I upgraded this bug to RC. We
prefer that the delay last days instead of weeks though.

On behalf of the Debian GNOME team,
Jeremy Bícha

Hey Jeremy.

Thanks :-)

Done... and forwarded to
https://github.com/linuxmint/cinnamon-screensaver/issues/507


Cheers,
Chris.

Root cause found, and it is not the same as the Anaconda issue in
https://gitlab.gnome.org/GNOME/pygobject/-/work_items/764 -
cinnamon-screensaver exports its D-Bus interface through the C skeleton
generated by gdbus-codegen, so it never goes through the Python
register_object() override.

What breaks it is that GLib.Pid is no longer an int. Up to 3.56.3 it was
gi._gi.Pid, a C type deriving from int; since 3.57.0 (upstream commit
b6e14902, "Reimplement GLib.spawn_async in Python") it is:

     class Pid:
         def __init__(self, pid): self._pid = pid
         def __int__(self): return self._pid
         def close(self): GLib.spawn_close_pid(self._pid)

No __index__, no rich comparisons. So for any application that keeps the
result of GLib.spawn_async() around, `pid > 0` now raises TypeError and
os.kill(pid, sig) no longer works. In cinnamon-screensaver this aborts the
unlock path and leaves the screen locked (details in #1143872).

I have patches for cinnamon-screensaver ready and also posted upstream,
so this should not hold pygobject back for long. But I would suggest raising
it with pygobject upstream as well: it is a silent API break with no NEWS
entry and no porting note, the class is unchanged in git main, and any other
Python application using GLib.spawn_async() is exposed to it. Adding
__index__ and the integer comparisons back (or simply deriving from int
again) would keep the old code working.

Yes, let's wait to see what upstream's response is.

Thank you,
Jeremy Bícha

We believe that the bug you reported is fixed in the latest version of
pygobject, 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 1143867@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Jeremy Bícha <jbicha@ubuntu.com> (supplier of updated pygobject 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: Sat, 15 Aug 2026 08:31:19 +0200
Source: pygobject
Built-For-Profiles: derivative.ubuntu noudeb
Architecture: source
Version: 3.57.1-1
Distribution: unstable
Urgency: medium
Maintainer: Debian GNOME Maintainers <pkg-gnome-maintainers@lists.alioth.debian.org>
Changed-By: Jeremy Bícha <jbicha@ubuntu.com>
Closes: 1143867
Changes:
 pygobject (3.57.1-1) unstable; urgency=medium
 .
   * New upstream release (Closes: #1143867)
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