On Wed, 20 May 1998 10:21:15 -0400, Dave Cinege <dcinege@psychosis.com>
said:
> One thing I left out of the opps report....I'll see stuff like this:
> free_one_pmd: bad directory entry 01000000
> in dmesg sometimes. Once that's present the box has a few hours left in it at
> best before an opps.
That's a pretty good sign of random memory corruption. You've got a
page table entry which looks like a null, unused page except for a
spurious bit set in the top of the word. Of course, this _could_ be
software, but I'd recommend looking at possible hardware faults first.
You can sometimes eliminate these problems by disabling the L2 cache,
for example (good for diagnosis, lousy for performance).
--Stephen
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