Bug 25572

I typed "slogin laptoy770-ether" without the "-l root" which would
have slogin attempt to login as a user who was not yet in the
/etc/master.passwd file.  At that point sshd dumped core.

This is not a big problem for me since I normally move a few public
keys over disable PasswordAuthentication and go with DSAAuthentication
but maintainers of sshd might want to look at the core dump.

How-To-Repeat: 
This is just before I changed PermitRootLogin to yes.  The sshd_config
file contained:

# This is ssh server systemwide configuration file.
#
# $FreeBSD: src/crypto/openssh/sshd_config,v 1.4.2.5 2001/01/18
#22:36:53 green Exp $

Port 22
#Protocol 2,1
#ListenAddress 0.0.0.0
#ListenAddress ::
HostKey /etc/ssh/ssh_host_key
HostDsaKey /etc/ssh/ssh_host_dsa_key
ServerKeyBits 768
LoginGraceTime 120
KeyRegenerationInterval 3600
PermitRootLogin no
# ConnectionsPerPeriod has been deprecated completely

# After 10 unauthenticated connections, refuse 30% of the new ones,
  and
# refuse any more than 60 total.
MaxStartups 10:30:60
# Don't read ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# Uncomment if you don't trust ~/.ssh/known_hosts for
  RhostsRSAAuthentication
#IgnoreUserKnownHosts yes
StrictModes yes
X11Forwarding yes
X11DisplayOffset 10
PrintMotd yes
KeepAlive yes

# Logging
SyslogFacility AUTH
LogLevel INFO
#obsoletes QuietMode and FascistLogging

RhostsAuthentication no
#
# For this to work you will also need host keys in
/etc/ssh_known_hosts
RhostsRSAAuthentication no
#
RSAAuthentication yes

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication yes
PermitEmptyPasswords no
# Uncomment to disable s/key passwords 
#SkeyAuthentication no
#KbdInteractiveAuthentication yes

# To change Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#AFSTokenPassing no
#KerberosTicketCleanup no

# Kerberos TGT Passing does only work with the AFS kaserver
#KerberosTgtPassing yes

CheckMail yes
#UseLogin no

# Uncomment if you want to enable sftp
#Subsystem      sftp    /usr/libexec/sftp-server

To reproduce the problem, attempt to slogin from an ordinary user
account where the uid does not exist on the machine being logged into.
Core file available on request.