following the README linked at: 

http://fedoraproject.org/w/index.php?title=Architectures/s390x&printable=yes

under F16 (x86_64) 

on the hercules instance, I get the segfault as the SSHD is 
receiving an incoming connection:
http://pastebin.ca/2130788

running:
[root@f16-64-hercules3 hercules]# grep -v ^# hercules.cnf

CPUSERIAL 002623        # CPU serial number
CPUMODEL  2064          # CPU model number: 3090, 7490, 2064
MAINSIZE  1024           # Main storage size in megabytes
NUMCPU    2             # Number of CPUs
CNSLPORT  3270          # TCP port number to which consoles connect
OSTAILOR  LINUX         # OS tailoring
LOADPARM  0120....      # IPL parameter
ARCHMODE  ESAME         # Architecture mode S/370, ESA/390 or ESAME
TZOFFSET  +0100         # Central Europe
HERCPRIO  -15           # Priority of the hercules process
LOGOPT    NOTIMESTAMP   # Avoid timestamps for log messages
TIMERINT  200           # Increase timers update interval, improves performance
TODDRAG   2             # Higher TOD clock drag means less interrupts -> higher performance
PANRATE   SLOW          # Slowest update
TRACEOPT  NOREGS        # Don't display registers
LDMOD     hdt3088.so hdt3420.so hdt3505.so

0120  3390 /home/data/fedora-14-s390x-20100927.img
0600  3088 CTCI -n /dev/net/tun -t 1500 192.168.200.3 192.168.200.4
0601  3088 CTCI -n /dev/net/tun -t 1500 192.168.200.3 192.168.200.4
[root@f16-64-hercules3 hercules]#   

coming in from the parent:

[root@f16-64-hercules3 ~]# ssh -X root@192.168.200.3
(no further local output)