FreeBSD 7 64 bits kernel crash debugging

Hi all,

I'm experiencing several kernel crashes with the GENERIC kernel and
with custom kernels as well. One of my MP3 players seems to be
recognized, but if I disconnect it from the USB port (even without
mounting the device), I got a kernel crash.

I've tried to follow the instructions at
http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html
I have dumpdev and dumpdir properly set to my swap partition (ad0s2b)
and to /var/crash.

However, during the next boot, I got a message that indicates it is
looking for a dump on such device but it couldn't find any.

How can I track this error?

Thanks in advance.
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