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Hello,

> Ah.  This explains things (Sparc64, -current, box runs quite solid in
> normal operation, but if I run Mozilla and *then* do things that cause
> swapping, I've seen more than one hard system lockup).

Try the patch Chuck Silvers posted here (and on port-sparc64 ) a couple 
of days ago. On my boxes ( U1 and U10 ) it prevents the kernel panics, 
instead the processes in question mostly get a bus error and dump core 
( although there were a few instances of zombie processes ). Still far 
from being satisfactory but it keeps your box running.

good luck
Michael
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