http://mail-index.netbsd.org/source-changes/2003/08/12/0034.html

contains a significant fix which could cause random crashes of PowerPC 
based NetBSD systems.  The cpu_switch code was incorrectly lowering SPL 
which was
leading random panics in remrunqueue and other places.  I have not 
looked to see if NetBSD-1.6 contains the same problem(s).
-- 
Matt Thomas                     email: matt@3am-software.com
3am Software Foundry              www: 
http://3am-software.com/bio/matt/ Cupertino, CA              
disclaimer: I avow all knowledge of this message.