UFS panic - steps to reproduce

Link to this paste: http://bugs.dragonflybsd.org/pastes/401

Added by tuxillo about 1 year ago.
Syntax: Plain Text 

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1. Create many files

#! /bin/sh

[ -d /usr ] && /root/files

for i in `seq 1 50000`
do
    dd if=/dev/random of=/root/files/file-$i bs=$i count=1
done

2. Start cpdup'ing to a UFS FS with softdep activated (in my case /usr/tmp)
 cpdup -I -vv /root/files /usr/tmp

3. Try a couple times

NOTE: This is going to blow up your UFS filesystem, so backup your vkernel img (or the VM HDD).