Inject page allocation failures for a specific kernel module, linux 4x

fail_page_alloc.sh

#!/bin/bash

# Inject page allocation failures only for a specific module
# Requires debugfs and kernel fault injection framework enabled

FAILTYPE=fail_page_alloc
module=$1

if [ -z $module ]
then
	echo "Usage: $0 <modulename>"
	exit 1
fi

modprobe $module

if [ ! -d /sys/module/$module/sections ]
then
	echo Module $module is not loaded
	exit 1
fi

echo 0          > /sys/kernel/debug/$FAILTYPE/require-start
echo 0xffffffff > /sys/kernel/debug/$FAILTYPE/require-end

#cat /sys/module/$module/sections/.text > /sys/kernel/debug/$FAILTYPE/require-start
#cat /sys/module/$module/sections/.data > /sys/kernel/debug/$FAILTYPE/require-end

#echo "0x"$(grep      afs_linux_write_begin /proc/kallsyms | awk '{print $1}')             > /sys/kernel/debug/$FAILTYPE/require-start
#echo "0x"$(grep -A 1 afs_linux_write_begin /proc/kallsyms | awk '{print $1}' | tail -n 1) > /sys/kernel/debug/$FAILTYPE/require-end

# task-filter /proc/<pid>/make-it-fail==1
echo N   > /sys/kernel/debug/$FAILTYPE/task-filter
echo 100 > /sys/kernel/debug/$FAILTYPE/probability
echo 10  > /sys/kernel/debug/$FAILTYPE/interval
echo 10  > /sys/kernel/debug/$FAILTYPE/times
echo 0   > /sys/kernel/debug/$FAILTYPE/space
echo 2   > /sys/kernel/debug/$FAILTYPE/verbose
echo 0   > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
echo 0   > /sys/kernel/debug/$FAILTYPE/ignore-gfp-highmem
echo 10  > /sys/kernel/debug/$FAILTYPE/stacktrace-depth

trap "echo 0 > /sys/kernel/debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT

echo "Injecting errors into the module $module... (interrupt to stop)"
sleep 1000000