linux-kernel - Re: How to go about debuging a system lockup?

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Message-ID: <20061120152044.GX8236@csclub.uwaterloo.ca>
Date:	Mon, 20 Nov 2006 10:20:44 -0500
From:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	"Protasevich, Natalie" <Natalie.Protasevich@...SYS.com>,
	Jesper Juhl <jesper.juhl@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: How to go about debuging a system lockup?

On Sat, Nov 18, 2006 at 12:09:54AM +0100, Stefan Richter wrote:
> Lennart Sorensen wrote:
> > OK, I have now tried connecting with firescope to just follow the dmesg
> > buffer across firewire.  Works great, until the system hangs, then
> > firescope reports that it couldn't perform the read.  I wonder what part
> > of the system has to lock up for the firewire card to no longer be able
> > to read memory on the system.
> 
> I suppose the PCI bus is no longer accessible to the chip.

Sure seems that way.  Makes me wonder if somehow a PCI transfer fails,
and the PCI controller isn't aborting the transfer after a timeout
(quite likely given the timeout timer is never enabled, and whenever I
try to do so, it seems to hang the system).  Time to start scoping the
lines.

--
Len Sorensen
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