I found my Netware 6.5 SP5 servers consistently abends when I restart the
IBM RSA II adaptor with the log:

Abend 1 on P01: Server-5.70.05-4348: Kernel detected an attempted context
switch when it was not allowed.

On the Server
IBMSPN.NLM Version 1.07 is loaded
'Server Power Down Options' is set to 'Off'

On the Adaptor
Host OS is set to 'Other'
All Server Timeouts have been 'Disabled'