Comment 16 for bug 790538

This PAM issue also affects xdm, which no longer allows people to log in
(it syslogs the same error message). This has caused us serious problems
on our multiuser login servers, because of course we cannot simply
reboot the machines and restarting xdm has the pleasant side effect of
instantly logging off all xdm-based users.

It has probably broken other daemons as well, some of them depending
on details of their configuration.