Created attachment 2684 [details] Patch for issue Previous commit making PermitRootLogin use a black- instead of a whitelist failed to check the return value of strcmp. Tested on ArchLinux.
Also, forgot to mention: Thanks to Mantas Mikulėnas aka grawity in #kerberos on freenode with help in debugging this issue!
This was separately reported and fixed in OpenSSH 7.1.
Close all resolved bugs after release of OpenSSH 7.7.