linux-kernel - Re: <IRQ> [<ffffffff810c9204>] ? __alloc_pages

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Message-ID: <20110310000502.GA13763@hash.localnet>
Date:	Wed, 9 Mar 2011 19:05:02 -0500
From:	Bob Copeland <me@...copeland.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	"Justin P. Mattock" <justinmattock@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Nick Piggin <npiggin@...nel.dk>,
	Dave Chinner <dchinner@...hat.com>,
	linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	Jiri Slaby <jirislaby@...il.com>,
	Nick Kossifidis <mickflemm@...il.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	linux-wireless@...r.kernel.org
Subject: Re: <IRQ> [<ffffffff810c9204>] ? __alloc_pages_nodemask+0x622/0x696

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?

Looks like ath_draintxq() can do something bad (e.g. DMA engine uses
an old address from ath_tx_return_buffer()) if DMA is still active
in ath_drain_all_txq().

But this is ath9k which I'm not so familiar with, maybe Luis can say.

-- 
Bob Copeland %% www.bobcopeland.com

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