On Thu, 3 May 2018 16:31:53 -0400 Michael Gold <mg...@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) = 124Are 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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