unable to make a crashdump

Hi.

I'm trying to get a crashdump from my kernel when it
panics. I have the following in my kernel:

makeoptions     DEBUG=-g
options         DDB, DDB_UNATTENDED

/etc/rc.conf:
dumpdev="/dev/ad0s1b"

But it does not dump anything, this is a (partial)
transcript from my screen (first time I wrote
something by hand in a long time btw ;-)

processor eflags = interrupt enabled, resume, IOPL = 0
current process = 38 (swi1: net)
trap number = 12

syncing bugger 3795

And then it hangs. Swap is 2 GB, RAM is 1 GB.


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