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Subject: Re: Hard lockup with 2.4.18-pre9 + preempt + lock break + O1k[23] +
	rmap
From: Robert Love <rml@tech9.net>
To: Mike Fedyk <mfedyk@matchmail.com>
Cc: Robert Jameson <rj@open-net.org>, linux-kernel@vger.kernel.org
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On Fri, 2002-02-15 at 15:18, Mike Fedyk wrote:

> I don't use USB, and I have had several machines lock up hard while doing
> medium to heavy IO.  I've had this happen with pre9-mjc2 and another patch
> that just contained pre9-preempt-schedo1
> (nyu.dyn.dhs.org:8080/patches/2.4.18-pre9-to-rmap12e-schedO1-rml.patch.bz2)

The -mjc and similar patches make debugging a bit, uh, hard ;)

> I'm running 2.4.18-pre9-ac3 now to see if I can reproduce without prempt and
> O(1).

If you can't reproduce it, I'd like to see if you can reproduce it
_only_ with preempt.  Also, if it happens on stock pre9 (no -ac) would
be of interest, since that doesn't have Andre's IDE patch.
 
> I have someone else from IRC that has the same issue with prempt+O(1)
> against vanilla 2.4.17.  He should be sending you a bug report soon.

Now this would be of interest, thanks.

> BTW, all machines ran the same kernel compiled for SMP, but some machines
> were UP.
>
> Has anyone else seen this?

	Robert Love

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