port-sparc/38288: NetBSD/sparc 4.99.55 GENERIC.MP Boot failure on 4 CPU SS10

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>Number:         38288
>Category:       port-sparc
>Synopsis:       NetBSD/sparc 4.99.55 GENERIC.MP Boot failure on 4 CPU SS10
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-sparc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 23 22:40:00 +0000 2008
>Originator:     Ed
>Release:        4.99.55 20080314
>Organization:
None
>Environment:
Sun SPARCstation 10
Dual SM100 CPU MBus Modules - CY7C601/602/605 x2 per module
>Description:
The install kernel boots and runs just fine. Installing the GENERIC.MP kernel 
and rebooting causes it to crash, there was a message I missed, followed by 
repeated instances of the following before the Watchdog barked and the machine 
halted with "Watchdog Reset" and "Data Access Exception".

trap type 0x2: pc=0xf0002000 npc=0xf0002004 psr=11000fcN<S,PS>

Where N is 1, 6, 3, 0, 5, 2, 7, 4 in a repeating pattern over and over with 
each message until the watchdog resets the machine.
>How-To-Repeat:
Install 4.99.55 from March 14, select the GENERIC.MP kernel and watch it not 
boot.
>Fix:
Not known.