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

it's very difficult to say without access to
a) the stack dump and
b) the kernel in question.
this is because it's hard to find this sort of problem without
knowing where the problem occurred. the stack dump
will provide addresses and the kernel image will be
enough to tie addresses to particular bits of code.

as an unrelated aside, this reference counting updates uninitialized memory.

Sorry about that. We're soaking a version of the kernel that includes
a reference count in the Block struct. It's so far used by the
Ethernet drivers, IP stack and USB code, and usbohci.c escaped a
little too early.

I've just pushed out a newer allocb.c to sources that initializes the
refence count at allocation.