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#!/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 <<EOF Usage: $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 } if [ $UID != 0 ]; then echo must be run as root >&2 exit 1 fi DEBUGFS=`mount -t debugfs | head -1 | awk '{ print $3}'` if [ ! -d "$DEBUGFS" ]; then echo debugfs is not mounted >&2 exit 1 fi FAILCMD_TYPE=${FAILCMD_TYPE:-failslab} FAULTATTR=$DEBUGFS/$FAILCMD_TYPE if [ ! -d $FAULTATTR ]; then echo $FAILCMD_TYPE is not available >&2 exit 1 fi LONGOPTS=probability:,interval:,times:,space:,verbose:,task-filter: LONGOPTS=$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 [ $? != 0 ]; then usage exit 1 fi eval set -- "$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=1 declare task_filter=Y declare -i probability=1 declare -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) echo $2 > $FAULTATTR/require-start shift 2 ;; --require-end) echo $2 > $FAULTATTR/require-end shift 2 ;; --reject-start) echo $2 > $FAULTATTR/reject-start shift 2 ;; --reject-end) 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 ;; esac done [ -z "$1" ] && exit 0 echo $oom_kill_allocating_task > /proc/sys/vm/oom_kill_allocating_task echo $task_filter > $FAULTATTR/task-filter echo $probability > $FAULTATTR/probability echo $times > $FAULTATTR/times trap "restore_values" SIGINT SIGTERM EXIT cmd="echo 1 > /proc/self/make-it-fail && exec $@" bash -c "$cmd"
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