This looks like the 1G dma bug. Please boot your machine with mem=1G, or physically remove 1G from your machine, and retest. This way I can confirm (and mark this bug as a duplicate).
** Changed in: linux-source-2.6.15 (Ubuntu)
Status: Unconfirmed => Needs Info
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bcm43xx driver :kernel panic when trying to set some wireless parameters
(iwconfig)
https://launchpad.net/bugs/54780
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