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Date: Tue, 15 Mar 2011 13:59:46 -0700
From: "Luis R. Rodriguez" <lrodriguez@atheros.com>
To: Bob Copeland <me@bobcopeland.com>
CC: Christoph Lameter <cl@linux.com>,
	"Justin P. Mattock" <justinmattock@gmail.com>,
	David Rientjes <rientjes@google.com>,
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	Nick Kossifidis <mickflemm@gmail.com>,
	"Luis Rodriguez" <Luis.Rodriguez@Atheros.com>,
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Subject: Re: <IRQ> [<ffffffff810c9204>] ? __alloc_pages_nodemask+0x622/0x696
Message-ID: <20110315205946.GL11878@tux>
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On Wed, Mar 09, 2011 at 04:05:02PM -0800, Bob Copeland wrote:
> On Wed, Mar 09, 2011 at 03:54:24PM -0600, Christoph Lameter wrote:
> > [ 7419.322770] wlan0: associated
> > [ 7427.161366] ath: Failed to stop TX DMA in 100 msec after killing last frame
> > [ 7427.161432] ath: Failed to stop TX DMA!
> > [ 7434.492398] ath: Failed to stop TX DMA in 100 msec after killing last frame
> > [ 7434.492462] ath: Failed to stop TX DMA!
> > [ 7603.339047]
> > =============================================================================
> > [ 7603.339053] BUG radix_tree_node: Padding overwritten. 0xffff88000008fe00-0xffff88000008fe32
> 
> > Could the ath driver corrupt memory if the TX DMA cannot be stopped?

Yes, this is why we have had a series of patches to address this upstream,
the latest one was for RX DMA failing to stop but Felix found a fix for that.
Apart from that I am not aware of more issues. Can you please try with
wireless-testing.git ?

  Luis