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Date: Thu, 27 Oct 2005 13:35:50 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Bjoern Koenig <bkoenig@cs.tu-berlin.de>
Message-ID: <20051027173550.GA81309@xor.obsecurity.org>
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Cc: current@freebsd.org, Kris Kennaway <kris@obsecurity.org>
Subject: Re: deadlocks with SMP and Pentium 3
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On Thu, Oct 27, 2005 at 12:56:35PM +0200, Bjoern Koenig wrote:
> Kris Kennaway wrote:
>=20
> >You need to break to DDB, trace processes and examine lock state with
> >commands like 'show alllocks' and 'show lockedvnods' to see what is
> >going on.
>=20
> Unfortunately the machine freezes completely and I can't break to the=20
> debugger anymore.

Try with KDB_STOP_NMI (called STOP_NMI) in 7.0.

Kris

> It happens absolutely unforeseen, therefore I can't=20
> examine states shortly before it freezes. I run several instances of=20
> 'unixbench shell' and 'ubench -c'; sometimes it takes a few seconds and=
=20
> sometimes 10 minutes until the machine stops working.
>=20
> I like to except hardware failures, because FreeBSD 4.11 and Windows=20
> Server 2003 run under high load without problems for several hours.
>=20
> I'll spend some more time.
>=20
> Thanks
> Bj?rn
>=20

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