netdev - Re: atl1 64-bit => 32-bit DMA borkage (reproducible, bisected)

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Date:	Sun, 20 Apr 2008 06:06:07 -0500
From:	Jay Cliburn <jacliburn@...lsouth.net>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Luca Tettamanti <kronos.it@...il.com>,
	Chris Snook <csnook@...hat.com>, Jeff Garzik <jeff@...zik.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Christoph Lameter <clameter@....com>, torvalds@...l.org
Subject: Re: atl1 64-bit => 32-bit DMA borkage (reproducible, bisected)

On Sun, 20 Apr 2008 15:14:53 +0400
Alexey Dobriyan <adobriyan@...il.com> wrote:

> On Sat, Apr 19, 2008 at 09:54:44PM -0500, Jay Cliburn wrote:
> > On Sat, 19 Apr 2008 18:45:35 +0400
> > Alexey Dobriyan <adobriyan@...il.com> wrote:
> > 
> > > OK, nailed it.
> > > 
> > > It's commit 5f08e46b621a769e52a9545a23ab1d5fb2aec1d4 aka "atl1:
> > > disable broken 64-bit DMA".
> > > 
> > > With this commit in tree, I can reproduce either
> > > a) kmalloc-2048 corruption after initscripts shutdown eth0
> > > 	http://marc.info/?l=linux-kernel&m=120820360221261&w=2
> > > 
> > > b) or oopses at filp_close() first reported long ago
> > > 	(sorry, can't find that email)
> > > 
> > > c) or hard hang after initscripts shutdown eth0 with even SysRq
> > > not working.
> > > http://marc.info/?l=linux-kernel&m=120795046008115&w=2
> > > 
> > > I have two boxes one with atl1, 4G RAM with 2G remapped after 4G
> > > boundary, another with r8169 connected with just ethernet cable.
> > > NICs agree on 1Gbps speed.
> > > 
> > > So, it's enough to scp 200 MB git archive and immediately start
> > > rebooting sequence for horrors described above to appear. It's not
> > > 100% reproducible but more like 90%.
> > 
> > Do I understand correctly that these failures occur only while the
> > network interface is going down?
> 
> Yep. During up or running there were no problems with this card.
> 

One more question:  Does it happen whether or not you're using atl1 as
a netconsole?
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