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

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Message-ID: <20080419215444.2d4623f5@osprey.hogchain.net>
Date:	Sat, 19 Apr 2008 21:54:44 -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 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?

Jay
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