The stage3 I used has a mismatch of the users in /etc/shadow and /etc/passwd files. The stage was downloaded from http://www.las.ic.unicamp.br/pub/gentoo/releases/x86/2005.0/stages/i686/stage3-i686-2005.0.tar.bz2 This is an official mirror in Brasil. I don't know what consequences this can have on a system, but I know, this should not happen. Reproducible: Always Steps to Reproduce: 1.Just unpack the stage and take a look 2. 3.
Actually, that is quite common and has exactly zero side-effects. A shadow entry is only required for a user that actually has a password set.