#!/bin/bash# SPDX-License-Identifier: GPL-2.0## NAME#	failcmd.sh - run a command with injecting slab/page allocation failures## SYNOPSIS#	failcmd.sh --help#	failcmd.sh [<options>] command [arguments]## DESCRIPTION#	Run command with injecting slab/page allocation failures by fault#	injection.##	NOTE: you need to run this script as root.# usage(){	cat >&2 <<EOFUsage: $0 [options] command [arguments] OPTIONS	-p percent	--probability=percent		likelihood of failure injection, in percent.		Default value is 1 	-t value	--times=value		specifies how many times failures may happen at most.		Default value is 1 	--oom-kill-allocating-task=value		set /proc/sys/vm/oom_kill_allocating_task to specified value		before running the command.		Default value is 1 	-h, --help		Display a usage message and exit 	--interval=value, --space=value, --verbose=value, --task-filter=value,	--stacktrace-depth=value, --require-start=value, --require-end=value,	--reject-start=value, --reject-end=value, --ignore-gfp-wait=value		See Documentation/fault-injection/fault-injection.rst for more		information 	failslab options:	--cache-filter=value 	fail_page_alloc options:	--ignore-gfp-highmem=value, --min-order=value ENVIRONMENT	FAILCMD_TYPE		The following values for FAILCMD_TYPE are recognized: 		failslab			inject slab allocation failures		fail_page_alloc			inject page allocation failures 		If FAILCMD_TYPE is not defined, then failslab is used.EOF} exit_if_not_hex() {    local value="$1"    if ! [[ $value =~ ^0x[0-9a-fA-F]+$ ]]; then        echo "Error: The provided value '$value' is not a valid hexadecimal number." >&2        exit 1    fi} if [ $UID != 0 ]; then	echo must be run as root >&2	exit 1fi DEBUGFS=`mount -t debugfs | head -1 | awk '{ print $3}'` if [ ! -d "$DEBUGFS" ]; then	echo debugfs is not mounted >&2	exit 1fi FAILCMD_TYPE=${FAILCMD_TYPE:-failslab}FAULTATTR=$DEBUGFS/$FAILCMD_TYPE if [ ! -d $FAULTATTR ]; then	echo $FAILCMD_TYPE is not available >&2	exit 1fi LONGOPTS=probability:,interval:,times:,space:,verbose:,task-filter:LONGOPTS=$LONGOPTS,stacktrace-depth:,require-start:,require-end:LONGOPTS=$LONGOPTS,reject-start:,reject-end:,oom-kill-allocating-task:,help if [ $FAILCMD_TYPE = failslab ]; then	LONGOPTS=$LONGOPTS,ignore-gfp-wait:,cache-filter:elif [ $FAILCMD_TYPE = fail_page_alloc ]; then	LONGOPTS=$LONGOPTS,ignore-gfp-wait:,ignore-gfp-highmem:,min-order:fi TEMP=`getopt -o p:i:t:s:v:h --long $LONGOPTS -n 'failcmd.sh' -- "$@"` if [ $? != 0 ]; then	usage	exit 1fi eval set -- "$TEMP" fault_attr_default(){	echo N > $FAULTATTR/task-filter	echo 0 > $FAULTATTR/probability	echo 1 > $FAULTATTR/times} fault_attr_default oom_kill_allocating_task_saved=`cat /proc/sys/vm/oom_kill_allocating_task` restore_values(){	fault_attr_default	echo $oom_kill_allocating_task_saved \		> /proc/sys/vm/oom_kill_allocating_task} ## Default options#declare -i oom_kill_allocating_task=1declare task_filter=Ydeclare -i probability=1declare -i times=1 while true; do	case "$1" in	-p|--probability)		probability=$2		shift 2		;;	-i|--interval)		echo $2 > $FAULTATTR/interval		shift 2		;;	-t|--times)		times=$2		shift 2		;;	-s|--space)		echo $2 > $FAULTATTR/space		shift 2		;;	-v|--verbose)		echo $2 > $FAULTATTR/verbose		shift 2		;;	--task-filter)		task_filter=$2		shift 2		;;	--stacktrace-depth)		echo $2 > $FAULTATTR/stacktrace-depth		shift 2		;;	--require-start)		exit_if_not_hex "$2"		echo $2 > $FAULTATTR/require-start		shift 2		;;	--require-end)		exit_if_not_hex "$2"		echo $2 > $FAULTATTR/require-end		shift 2		;;	--reject-start)		exit_if_not_hex "$2"		echo $2 > $FAULTATTR/reject-start		shift 2		;;	--reject-end)		exit_if_not_hex "$2"		echo $2 > $FAULTATTR/reject-end		shift 2		;;	--oom-kill-allocating-task)		oom_kill_allocating_task=$2		shift 2		;;	--ignore-gfp-wait)		echo $2 > $FAULTATTR/ignore-gfp-wait		shift 2		;;	--cache-filter)		echo $2 > $FAULTATTR/cache_filter		shift 2		;;	--ignore-gfp-highmem)		echo $2 > $FAULTATTR/ignore-gfp-highmem		shift 2		;;	--min-order)		echo $2 > $FAULTATTR/min-order		shift 2		;;	-h|--help)		usage		exit 0		shift		;;	--)		shift		break		;;	esacdone [ -z "$1" ] && exit 0 echo $oom_kill_allocating_task > /proc/sys/vm/oom_kill_allocating_taskecho $task_filter > $FAULTATTR/task-filterecho $probability > $FAULTATTR/probabilityecho $times > $FAULTATTR/times trap "restore_values" SIGINT SIGTERM EXIT cmd="echo 1 > /proc/self/make-it-fail && exec $@"bash -c "$cmd"