Re: ath(4) panic: bus_dmamap_load_sg: no mbuf packet header!

From: Sam Leffler (sam_at_errno.com)
Date: 09/27/05

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    Date: Mon, 26 Sep 2005 19:27:30 -0700
To: Pawel Jakub Dawidek <pjd@freebsd.org>

    Pawel Jakub Dawidek wrote:
    > Hi.
    >
    > I configured NAT (using pf(4)) on my laptop:
    >
    > MacOSX (Tiger) <-----> ath0[my laptop]bge0 <-----> local machine
    >
    > When I started downloading few files on Mac from "local machine" via FTP
    > in parallel I got this panic after few minutes (I was able to reproduce it):
    >
    > panic: bus_dmamap_load_sg: no mbuf packet header!
    >
    > And the backtrace:
    >
    > panic()
    > bus_dmamap_load_sg()+0x2a
    > ath_start()+0x2ae
    > taskqueue_run()+0xaf
    > taskqueue_swi_run()+0x13
    > ithread_loop()
    > ...
    >
    > Any ideas?
    >

    I'm guessing you hand-transcribed stuff since there are typos (e.g.
    bus_dmamap_load_mbuf_sg is not called from ath_start but is called from
    ath_tx_start which is called from ath_start). This indicates the mbuf
    chain is malformed (missing a packet header). Since the packet is
    apparently coming in via pf you might want to look there.

            Sam
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