Comment # 7 on bug 106199 from Öyvind Saether

I don't seem to have this problem with
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git from 20
minutes ago. Booted with that git and no problem logging in and out again.
Rebooted with 4.17rc2, problem. Rebooted again with git, no problem.

I'm guessing it's this that fixed it,
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f940fac655d5a728bc5ef6204d2ec4c3b3ea6c3