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[Bug] Jessie with linux-image-4.4.0-1-amd64 and systemd-shim: no login possible

Hi all,

I encountered severe Bug, but I don't know what to file it against, so according to the debian bug filing guidelines I'm posting here:

Running the following configuration, I'm not able to log in to one of my systems anymore (my other systems run systemd as init and are unaffected):

Debian Jessie
Thinkpad T420
kernel 4.4.0-1-amd64
systemd-shim 9-1
systemd+udev packages: 228-6, 229-2, 229-3

log files do not contain anything relevant. Messages on the VTs are:
systemd-logind[8573]: Failed to start user service, ignoring: Unknown unit: user@1000.service
systemd-logind[8573]: New session 8 of user arian.
systemd-logind[8573]: removed session 8.

workaround: use kernel 4.3

same thing with ssh, authentication works, but I don't get any shell but an immediate disconnection:
> debug1: Server accepts key: pkalg ssh-ed25519 blen 51
> debug1: Authentication succeeded (publickey).
> Authenticated to ([]:22).
> debug1: channel 0: new [client-session]
> debug1: Requesting no-more-sessions@openssh.com
> debug1: Entering interactive session.
> debug1: pledge: network
> debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
> debug1: Sending environment.
> debug1: Sending env LANG = de_CH.UTF-8
> debug1: channel 0: free: client-session, nchannels 1
> Connection to closed by remote host.

It's rather strange to me. Kernel upgrades certainly should not cause such a regression.
logins work with systemd as PID1, but unprivileged LXC-containers do not, so that is not an option.

If anyone could help or point to the right people, that'd be highly appreciated.

Regards, Arian

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