Bug#897654: libpam-systemd: "Failed to create session: No such process"

[Michael Biebl]

On Thu, 3 May 2018 16:31:53 -0400 Michael Gold <mgold at qnx.com> wrote:
> Package: libpam-systemd
> Version: 238-4
> Severity: important
> 
> At some point in the past, I was able to shut down my system as a
> non-root user:
> 	dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.PowerOff" boolean:true
> 
> But it now gives me this error:
> 	Error org.freedesktop.DBus.Error.InteractiveAuthorizationRequired: Interactive authentication required.
> 
> ...probably because I have no loginctl session:
> 	$ loginctl
> 	   SESSION        UID USER             SEAT             TTY
> 	
> 	0 sessions listed.
> 	$ loginctl session-status
> 	Could not get properties: No such process
> 	$ strace -f loginctl session-status 2>&1|grep ESRCH
> 	$ 
> 
> I log in via lightdm and run an xsession script.  It may have worked in
> the past because I was running ck-launch-session, which apparently no
> longer exists.  pam_systemd also logs "No such process":
> 	Apr 09 11:37:30 golbez lightdm[14767]: pam_systemd(lightdm:session): pam-systemd initializing
> 	Apr 09 11:37:30 golbez lightdm[14767]: pam_systemd(lightdm:session): Asking logind to create session: uid=1000 pid=14767 service=lightdm type=x11 class=user desktop=lightdm-xsession seat=seat0 vtnr=7 tty= display=:0 remote=no remote_user= remote_host=
> 	Apr 09 11:37:30 golbez lightdm[14767]: pam_systemd(lightdm:session): Failed to create session: No such process
> 
> The same happens if I log in on a tty rather than X11:
> 	Apr 09 12:07:58 golbez login[16106]: pam_systemd(login:session): pam-systemd initializing
> 	Apr 09 12:07:58 golbez login[16106]: pam_systemd(login:session): Asking logind to create session: uid=1000 pid=16106 service=login type=tty class=user desktop= seat= vtnr=0 tty=tty3 display= remote=no remote_user= remote_host=
> 	Apr 09 12:07:58 golbez login[16106]: pam_systemd(login:session): Failed to create session: No such process
> 
> logind is running:
> 	root     15741  0.0  0.0  64304  5808 ?        Ss   11:59   0:00 /lib/systemd/systemd-logind
> (I restarted it after the first failure.)
> 
> strace shows that logind fails to open a 'cgroup' file:
> 	openat(AT_FDCWD, "/proc/16134/cgroup", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
> 	sendmsg(12, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=..., iov_len=104}, {iov_base="\17\0\0\0No such process\0", iov_len=20}], msg_iovlen=2, msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 124

Are you using hidepid?

-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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