Re: 2.4.18 SPARC SMP oops

tomas szepe (
Tue, 26 Mar 2002 23:56:54 +0100 (CET)


> > The following oops is more-or-less-deterministically reproducible
> > on my dual-processor SPARCstation 10 with 160MB RAM. It tends to send
> > the system down under heavy load caused by either sendmail/procmail
> > or apache. I first came across the bug at around 2.4.17, though it's
> > probably been lurking in the kernel much longer. I've gone through
> > quite a bit of trouble attempting to get the oops barf at me in 2.2.x
> > in case it's my hw config that's behind the whole problem, but I haven't
> > run into any breakdowns, 2.2.21-rc2 included.
> Assuming that you can handle your load, at least briefly, with a single
> CPU, have you tried booting with 'nosmp' on this machine? A serious test
> would build without SMP to get the whole locking stuff to go away, but
> this is quick and dirty.

Right, good point. I'll boot the machine nosmp and try to reproduce the
oops over the weekend.

> I'm convinced that there are evils still lurking in SMP after all these
> years.

trouble is, I have no idea whether the bug is present in earlier
2.4 kernels as well without me noticing, or if it's a relatively
new thing (Sure I could check, but it's not like I can reproduce
the oops in under an hour or so of trying: that's what I meant by
"more-or-less-deterministically" :D).


pub 1024d/8e316a84 2002-01-29 tomas szepe <>
openpgp f/print 2955 2eea c4b8 b09e 7ae1 4d5d 68e3 d606 8e31 6a84

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