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Date:      Thu, 8 Mar 2007 21:41:57 -0500
From:      Kris Kennaway <kris@obsecurity.org>
To:        Eirik ?verby <ltning@anduin.net>
Cc:        stable@freebsd.org
Subject:   Re: Panic: spin lock smp rendezvous ... held too long
Message-ID:  <20070309024157.GA58736@xor.obsecurity.org>
In-Reply-To: <3FCD4E86-40CA-4E27-AF97-DFB94F02077C@anduin.net>
References:  <3FCD4E86-40CA-4E27-AF97-DFB94F02077C@anduin.net>

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On Fri, Mar 09, 2007 at 12:44:03AM +0100, Eirik ?verby wrote:
> Hi all,
>=20
> I just installed 6.2-RELEASE on a Supermicro 6013P-8 server, a dual =20
> P4-Xeon 2.4ghz with 4GB ECC memory and an asr driven SCSI RAID =20
> controller.
>=20
> It has been working OK (although I suspect the asr driven, being =20
> giant-locked, is very inefficient) for a little while, but as I was =20
> extracting a bunch of tarballs it paniced like so:
>=20
> spin lock smp rendezvous held by 0xc9d54600 for > 5 seconds
> panic: spin lock held too long
> cpuid =3D 0
>=20
> I don't have a dump device (though I'm setting that up for the next =20
> reboot). However, I have tried turning off HT, to see if that might =20
> help.
>=20
> Does this look familiar to anyone? Or do I need to produce more data =20
> if it happens again?

It can mean that something deadlocked.  Turning on WITNESS may help to
debug this, although it has a large performance impact.

Kris

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