Package: systemd-shim Version: 10-3 Severity: important Preface: Some software begins to depends on an existing logind-session. These sessions are created + tracked via libpam-systemd, which makes an dbus call to systemd-logind.
systemd-shim it here to support logind, which replaces consolekit (AFAIUI) on systems where systemd is not the init process (i.e. pid 1). Problem: In auth.log: login[6880]: pam_systemd(login:session): Failed to create session: No such device or address The message belongs to -ENXIO, which is emitted here: https://github.com/systemd/systemd/blob/master/src/basic/cgroup-util.c#L1458 Result: $ loginctl SESSION UID USER SEAT TTY 0 sessions listed. Expected result: $ loginctl [... some sessions ...] Root cause: $ systemd-cgls Control group /: -.slice ├─ 1 init [2] ├─1630 /lib/systemd/systemd-udevd --daemon ├─3661 /sbin/rpcbind -w [...] $ cat /proc/1/cgroup # or some other pid 4:name=systemd:/ [...] But since systemd 226 (AFAICT), all pids are moved (by systemd as init) into the /init.scope cgroup. In the systemd-shim case, systemd-logind still expects pid 1 and the pid of the login process to be in a such named cgroup - but fails, because everything is in the root slice (-.slice) and "nothing comes after the /". Evidence: $ mkdir /sys/fs/cgroup/systemd/init.scope $ echo 1 > /sys/fs/cgroup/systemd/init.scope/tasks # ... move login process (kdm/mingetty/...) there, too ... # e.g. by respawning mingetty on a particular tty, e.g. tty4 $ systemd-cgls # or: cat /proc/$PID/cgroup [... those two processes are indeed now in the new cgroup ...] Now login on that tty4, so that the login process is (resp. will be spawned in) the /init.scope cgroup. $ loginctl [...] 1 sessions listed. Required action: systemd-shim has to adjust the cgroups (using cgmanager?) accordingly for systemd-logind (and thus pam-logind) to succeed. Thank you. -- System Information: Debian Release: buster/sid APT prefers testing APT policy: (500, 'testing') Architecture: i386 (x86_64) Kernel: Linux 4.16.0-rc6 (SMP w/2 CPU cores; PREEMPT) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages systemd-shim depends on: ii cgmanager 0.41-2 ii libc6 2.27-2 ii libglib2.0-0 2.53.4-3 systemd-shim recommends no packages. Versions of packages systemd-shim suggests: ii pm-utils 1.4.1-9 -- no debconf information