btrfs syslog trying to cause hang 2

#!/bin/bash
#
# Script to try to get sysrq+w sent to cwillu for btrfs fixing
#
### BEGIN INIT INFO
# Provides: petersysrq
# Required-Start: $network $remote_fs
# Required-Stop: $network $remote_fs
# Default-Start: 3 5
# Default-Stop: 0 1 2 6
# Description: Start the sshd daemon
### END INIT INFO

# wait for greet to appear
n=1
while ! ps -ef | grep greet | grep -v grep >/dev/null 2>&1; do
    sleep 0.25
    let n++
    if [ "$n" -gt 2000 ]; then
        # if took longer than 5 minutes, give up
        exit 1
    fi
done

nc cwillu.com 10101 < /dev/kmsg >/dev/null 2>&1 &
pid1=$!

while true; do sleep 0.25; iostat -xm | nc cwillu.com 10101; done &
pid2=$!

n=1
while ps -ef | grep greet | grep -v grep >/dev/null 2>&1; do
    sleep 0.25
    echo "------ peter's sysrq run #$n -------" >> /var/log/messages
    echo w > /proc/sysrq-trigger
    let n++
done
echo "------ peter's sysrq done -------" >> /var/log/messages

sleep 10
kill $pid1
kill $pid2