Bug#801354: libpam-systemd: breaks lightdm: Failed to create session: Connection timed out

[Martin Pitt]

Control: tag -1 confirmed

Hello Vincent,

Vincent Lefevre [2015-10-09  3:13 +0200]:
> After the upgrade to systemd packages 227-1, I get various timeouts
> with lightdm:
> 
> [...]
> Oct 09 02:57:45 zira systemd[1581]: run-rpc_pipefs.mount: Mount process exited, code=exited status=1
> Oct 09 02:57:45 zira systemd[1581]: Failed unmounting /run/rpc_pipefs.
> Oct 09 02:57:45 zira umount[1587]: umount: /boot: umount failed: Operation not permitted

[...] Note that these "failed to unmount" messages are from an *user*
systemd instance, not from pid 1. This explains the permission errors.
I confirm this behaviour, but it should be harmless -- my VMs boot
just fine with these, it's mostly cosmetical. Bug #801361 was just
filed for something which I suspect to be the same issue, BTW (but not
confirmed yet). If it's the same, we can track the confusing "failed
to unmount" issue there.

> Oct 09 02:58:10 zira lightdm[1578]: pam_systemd(lightdm-greeter:session): Failed to create session: Connection timed out
> [...]

That might be a followup of the above (user systemd instance failed
due to the bad unmounting, and thus session creation failed), or
something entirely unrelated. I don't see this kind of failure in a
Debian sid VM (LXDE with lightdm), and the "boot-smoke" autopkgtest
ran fine as well.  However: I do see the bug in an Ubuntu VM (with
https://launchpad.net/~pitti/+archive/ubuntu/systemd, i. e. 227 plus
latest changes from trunk) when running the boot-smoke test, so I can
reproduce this. I'll bisect / report upstream, etc.

Thanks,

Martin

-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)
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