info-vax@ucbvax.berkeley.edu.UUCP (01/24/86)
We run 4.2 BSD on a Vax 750. Lately we have been experiencing an annoyingly
large number of crashes due to a "machine check 2: cp tbuf par fault".
Over the past 2 years, under both 4.1 and 4.2, we have had this same problem
in episodes. For a few months, the machine runs just fine (up continuously
for 3 months or so). Then it comes down with a sort of disease and crashes
frequently. We are averaging about a crash and a half per day now. The
obvious remedies, such as reseating boards and cleaning card edge fingers
don't seem to help.
I recall some discussion last year about this problem being common to
the 750 under Unix, and about revised hardware and microcode that were
variously rumored to make the problem either better or worse.
Has anyone found the root cause of this problem, or at least a reasonably
effective solution?
Brad Yearwood
Kontron Electronics {voder, pyramid, loral}!kontron!brad
Mountain View, CA