[9fans] panic

[Markus Sonderegger]

hi,
i got the following panic in a kernel I compiled today: 

        panic: D2B called on non-block f0d72af8 (double-free?)
        panic: D2B called on non-block f0d72af8 (double-free?)
        dumpstack disabled
        cpu0: exiting

it happen evertime i plug a usb device in. i don't know how
to debug this. any suggestions?
with my old kernel(2008-04-30) everthing works fine.

markus