Thanks to all and sundry for your suggestions. The responses were basically:
1) Install the nfs jumbo patch.
2) Check the memory.
I'd checked the memory many times, and it always passed the diagnostic,
so I installed the nfs jumbo patch and built a new kernel. This seemed
to make the problem worse, the machine began crashing more frequently.
At this point I yanked blocks of memory. This seems to have done the
trick, although it is too soon to be completely sure.
Contributors were:
boes@corona.AuE.com (Barry A. Boes)
Curt Freeland <curt@ecn.purdue.edu>
tommy@homxb.att.com
stern@sunne.East.Sun.COM (Hal Stern - NE Area Systems Engineer)
kalli!upstage!glenn@fourx.Aus.Sun.COM (Glenn Satchell)
@sgiblab.sgi.com.UUCP:seidc!gwolsk (Guntram Wolski)
poffen@sj.ate.slb.com (Russ Poffenberger)
kwthomas@nsslsun.nssl.uoknor.edu (Kevin W. Thomas)
Robert L Krawitz <rlk@Think.COM>
kwthomas@nsslsun.nssl.uoknor.edu (Kevin W. Thomas)
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