Well, the upgrade was easy enough, some weird LDAP database corruption that was fixed easily by running db4.7_recover in /var/lib/ldap.

There is something fishy going on in /etc/nsswitch and using ‘files’ instead of compat. Got lots of segfaults:

[90474.491264] zsh[5668]: segfault at bfcf07ef ip 001be398 sp
bfce4efc error 6 in libnss_files-2.12.1.so[1bc000+a000]

Not enough for a bug report (yet), I still need to examine this further.