That problem still hits me using recent NetBSD-2.0_STABLE.  I have a
core dump with the kernel image and its associated gdb symbols version
if someone wants to help with it (private mail from *@netbsd.org should
get in at this address, I'll provide the files on an ftp account to the
uvm expert who'll want to help, if any, on request :)
This is not GENERIC though.

Thanks,
Matt

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