last saturday after yet another power cut my netbsd died and it stops
booting with this message:

uvm_pagefree: warning: freeing page with a loan count 278435456
panic: uvm_pagefree: loan count
The operating system has halted.
Please press any key to reboot.

I've tried booting in single user mode and with boot disks, but it won't
boot.
any clues? what can I do?
thanks a lot.