Package: libc6 Version: 2.32-1 Severity: serious X-Debbugs-Cc: pkg-systemd-maintain...@lists.alioth.debian.org
The NSS modules provided by glibc 2.32 require new symbols, which are therefore not provided by libc6 2.31. This is why we require restarting daemons after the new libc6 is installed. systemd-logind is also using NSS modules, so it needs to be restarted. Unfortunately that's not something possible without killing Xorg sessions (see bug#919509). Not restarting systemd-logind means that it is not able to load new NSS modules, howeveralready loaded modules are still usable. One visible consequence is that on systems where no user sessions have been registered with systemd-logind, new sessions will fail to register after the libc6 upgrade with the following king of error: sshd[647]: pam_systemd(sshd:session): Failed to create session: No such process Not registering the session causes among other things XDG_RUNTIME_DIR to not be defined (or even created), causing autopkgtest failures: https://ci.debian.net/data/autopkgtest/testing/amd64/c/calibre/15138528/log.gz Here is a simpler way to reproduce the problem: - Schedule the libc6 upgrade from 2.31 to 2.32 (currently bookworm to sid) to happen on a system which hasn't seen any user login since it has been booted. For instance trigger it from /etc/rc.local. - Log onto the system (for instance through TTY or SSH), observe the error message in the logs and the absence of XDG_RUNTIME_DIR in the environment.
