[kde] [Bug 473683] New: SDDM Mixes seats in multi-seat setup (Failed to create session: TTY tty1 is virtual console but seat seat1 is not seat0)

[dimanne]

https://bugs.kde.org/show_bug.cgi?id=473683

            Bug ID: 473683
           Summary: SDDM Mixes seats in multi-seat setup (Failed to create
                    session: TTY tty1 is virtual console but seat seat1 is
                    not seat0)
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Kubuntu
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: causal.consistency at proton.me
  Target Milestone: ---

# SUMMARY

It looks like login session from a second seat does get initialised properly.

### This is what I observe:

Only one session is reported by loginctl:

Only one session is detected

```
loginctl list-sessions
SESSION  UID USER    SEAT  TTY
      4 1000 dimanne seat0 tty2

1 sessions listed.
```

Directory `/run/user/1001` is not created.

`DBUS_SESSION_BUS_ADDRESS` of the second user is empty.

systemctl --user list-units prints:
```
Failed to connect to bus: No medium found
```

Finally, `loginctl session-status` says:

```
Could not get properties: Unknown object 'org/freedesktop/login1/session/auto'
```

### Why it happens

I think this happens because sddm failed to properly initialise login session.

This is how sddm logs look for "good" login:

```
Aug 20 09:52:17 impedance sddm[8212]: Authentication for user  "dimanne" 
successful
Aug 20 09:52:17 impedance sddm-greeter[8590]: Message received from daemon:
LoginSucceeded
Aug 20 09:52:17 impedance sddm-helper[9033]: pam_kwallet5(sddm:setcred):
pam_kwallet5: pam_sm_setcred
Aug 20 09:52:17 impedance sddm-helper[9033]: pam_limits(sddm:session): Could
not set limit for 'nofile' to soft=16777216, hard=16777216: Operation not
permitted; uid=0,euid=0
Aug 20 09:52:17 impedance sddm-helper[9033]: pam_unix(sddm:session): session
opened for user dimanne(uid=1000) by (uid=0)
Aug 20 09:52:17 impedance sddm-helper[8362]: [PAM] Closing session
Aug 20 09:52:17 impedance sddm-helper[8362]: pam_unix(sddm-greeter:session):
session closed for user sddm
Aug 20 09:52:17 impedance sddm-helper[8362]: [PAM] Ended.
Aug 20 09:52:17 impedance sddm[8212]: Auth: sddm-helper exited successfully
Aug 20 09:52:17 impedance sddm[8212]: Greeter stopped.
SDDM::Auth::HELPER_SUCCESS
Aug 20 09:52:17 impedance sddm-helper[9033]: pam_kwallet5(sddm:session):
pam_kwallet5: pam_sm_open_session
Aug 20 09:52:17 impedance sddm-helper[9078]: pam_kwallet5: final socket path:
/run/user/1000/kwallet5.socket
Aug 20 09:52:17 impedance sddm-helper[9033]: pam_env(sddm:session): deprecated
reading of user environment enabled
Aug 20 09:52:17 impedance sddm-helper[9033]: Writing cookie to
"/tmp/xauth_vDhCDz"
Aug 20 09:52:17 impedance sddm-helper[9033]: Starting X11 session: ""
"/etc/sddm/Xsession \"/usr/bin/startplasma-x11\""
Aug 20 09:52:17 impedance sddm[8212]: Session started true
Aug 20 12:27:05 impedance sddm-greeter[8534]: Reading from
"/usr/share/xsessions/plasma.desktop"
```


And this is how they look for 2nd seat

```
Aug 20 12:27:05 impedance sddm[8212]: Authentication for user  "yulia" 
successful
Aug 20 12:27:05 impedance sddm-greeter[8534]: Message received from daemon:
LoginSucceeded
Aug 20 12:27:05 impedance sddm-helper[56829]: pam_kwallet5(sddm:setcred):
pam_kwallet5: pam_sm_setcred
Aug 20 12:27:05 impedance sddm-helper[56829]: pam_limits(sddm:session): Could
not set limit for 'nofile' to soft=16777216, hard=16777216: Operation not
permitted; uid=0,euid=0
Aug 20 12:27:05 impedance sddm-helper[56829]: pam_unix(sddm:session): session
opened for user yulia(uid=1001) by (uid=0)
Aug 20 12:27:05 impedance sddm-helper[56829]: pam_systemd(sddm:session): Failed
to create session: TTY tty1 is virtual console but seat seat1 is not seat0
Aug 20 12:27:05 impedance sddm-helper[56829]: pam_kwallet5(sddm:session):
pam_kwallet5: pam_sm_open_session
Aug 20 12:27:05 impedance sddm-helper[56832]: pam_kwallet5: final socket path:
/tmp/kwallet5_yulia.socket
Aug 20 12:27:05 impedance sddm-helper[56829]: pam_env(sddm:session): deprecated
reading of user environment enabled
Aug 20 12:27:05 impedance sddm-helper[56829]: Writing cookie to
"/tmp/xauth_MzDsqA"
Aug 20 12:27:05 impedance sddm-helper[56829]: Starting X11 session: ""
"/etc/sddm/Xsession \"/usr/bin/startplasma-x11\""
Aug 20 12:27:05 impedance sddm[8212]: Session started true
Aug 20 12:27:05 impedance sddm-helper[8399]: [PAM] Closing session
Aug 20 12:27:05 impedance sddm-helper[8399]: pam_unix(sddm-greeter:session):
session closed for user sddm
Aug 20 12:27:05 impedance sddm-helper[8399]: [PAM] Ended.
Aug 20 12:27:05 impedance sddm[8212]: Auth: sddm-helper exited successfully
Aug 20 12:27:05 impedance sddm[8212]: Greeter stopped.
SDDM::Auth::HELPER_SUCCESS
```


STEPS TO REPRODUCE
1. Create two seats
2. Login 1st seat.
3. Login 2nd seat.

OBSERVED RESULT

See above in the section "What I observe".





SOFTWARE/OS VERSIONS
Operating System: Kubuntu 23.10
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10
Kernel Version: 6.3.0-7-generic (64-bit)
Graphics Platform: X11

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