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    SubjectRe: <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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