DBCA hangs at 85%

cause:

kernel BUG at kernel/exit.c:904!
kernel/exit.c:904!
solution:

Upgraded the Kernel to version RHEL4.7

also
the same solution for the Enterprise Manager Agent Starts on RHEL 4
refer metalink Doc ID: 729543.1
Linux Crashes when Enterprise Manager Agent Starts on RHEL 4 Update 6 and 7

reference:
http://forums.oracle.com/forums/thread.jspa?threadID=871254
http://newappsdba.blogspot.com/2009/06/kernel-bug-and-oracle-enterprise-linux.html