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    SubjectRe: [TIP] BUG kmalloc-4096: Poison overwritten (ath5k_rx_skb_alloc)
    On Fri, May 22, 2009 at 10:39:31AM +0100, Sitsofe Wheeler wrote:
    > The poison message has not reappeared but this morning there was a
    > sudden break in the connection. Only toggling the wifi via rfkill
    > brought things back to life. dmesg below:
    >
    > [ 71.445152] wlan0: associated
    > [ 5771.345217] ath5k phy0: noise floor calibration timeout (2412MHz)
    > [ 5774.632085] wlan0: no probe response from AP 00:01:38:d6:0b:4f - disassociating

    Card got into a bad state here somehow,

    > [ 5774.869703] ath5k phy0: failed to wakeup the MAC Chip
    > [ 5774.869717] ath5k phy0: can't reset hardware (-5)

    -EIO, a really bad state (we're doing a lot of resets, not sure
    offhand why -- maybe just the calibration timer since it doesn't
    look like the channel is changing as would happen in a scan).

    When we see this either card isn't getting any power (e.g. due
    to rfkill, but I think that happened later here) or card just
    isn't responding. Seems we should give up after a while rather
    than spamming the log forever.

    > [ 5834.122061] ath5k 0000:01:00.0: PCI INT A disabled

    I take it this is when you hit rfkill, which also did an rmmod and
    probably disconnected it from the bus?

    > [ 5836.901310] pci 0000:01:00.0: reg 10 64bit mmio: [0x000000-0x00ffff]

    and here's where you turned it back on...

    > Another weird thing that I've noticed with 2.6.30 kernels (although it
    > might be happening with older ones) is that periodically (maybe once a
    > day) the packet loss between the computer and the access point will
    > become very high and will stay that way until the computer is rebooted.
    > I do not know if toggling via rfkill will also solve that problem.

    It sounds like a similar case. There's a patch on the way (I don't
    think has hit 2.6.30 yet) that fixes a regression that can affect
    calibration in 802.11g mode.

    --
    Bob Copeland %% www.bobcopeland.com



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