Bug#806256: libpam-systemd: log out from a TTY and your X input devices get lost!

[Francesco Poli (wintermute)]

Package: libpam-systemd
Version: 228-2
Severity: normal

Hello,
I noticed a weird bug that is possibly caused by libpam-systemd.

Steps to reproduce (on a box with systemd as PID 1 process):

  0) login on TTY1 (virtual terminal 1) as a regular user

  1) start an X session with

     $ startx

  2) press [Ctrl+Alt+F2], in order to switch to TTY2

  3) login on TTY2 as the same user

  4) logout by pressing [Ctrl+D] on the empty command prompt

  5) awkwardly the screen goes automatically back to the X session
     (rather than showing a fresh new TTY2 login prompt)

  6) even more awkwardly, any keyboard and mouse input is ignored
     except for [Ctrl+Alt+F1], which however causes the screen to
     go blank and immediately enter sleep mode

  7) the only way out seems to be a poweroff command, issued by
     pressing the power button (which is handled by acpid)

I didn't try to SSH into the box and take a look at the system...


I suspect that this bug is caused by libpam-systemd, since starting
an X session on a box with systemd as PID 1 process, but without
libpam-systemd installed, causes the same inability to use X input
devices.

I noticed this bug some days ago with libpam-systemd/227-2: I waited
for version 228-2 to migrate to testing, before reporting the bug.
After reproducing the same exact misbehavior with libpam-systemd/228-2,
I decided that it is time to report it.

Could you please investigate this bug and fix it and/or forward it
upstream, as appropriate?

Thanks for your time!
Bye.



-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (800, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.2.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libpam-systemd depends on:
ii  dbus            1.10.4-1
ii  libc6           2.19-22
ii  libpam-runtime  1.1.8-3.1
ii  libpam0g        1.1.8-3.1
ii  libselinux1     2.4-3
ii  systemd         228-2
ii  systemd-sysv    228-2

libpam-systemd recommends no packages.

libpam-systemd suggests no packages.

-- no debconf information