[Bug 198169] Creating jail corrupts /etc/passwd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198169

            Bug ID: 198169
           Summary: Creating jail corrupts /etc/passwd
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: hbowden at securelabsllc.com

I just installed FreeBSD 10.1 RELEASE on a iMac. After installing and setting
up networking and installing the sudo package I used freebsd-update fetch, then
freebsd-update install then I rebooted. Then Using the script below I tried
creating a jail.

#!/bin/sh
setenv D /usr/home/nah/jail
mkdir -p $D
cd /usr/src
make buildworld
installworld DESTDIR=$D
distribution DESTDIR=$D
mount -t devfs devfs $D/dev

After the script finishes running the system becomes broken. By broken I mean
sudo returns, sudo unknown uid 1001 who are you, when you try to use it, and su
returns, who are you? Looking at /etc/passwd the user I created is no longer
there and root has no password anymore, But the home directory for the user is
still there. If I use exit to log out and try to login with root, it logs me in
with no password prompt. And trying to su to the user nah(the one deleted)
returns unkown login: nah. 

So any ideas on why running the script above destroys my install?

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