v4.19.13 snapshot.
diff --git a/tools/testing/fault-injection/failcmd.sh b/tools/testing/fault-injection/failcmd.sh
new file mode 100644
index 0000000..29a6c63
--- /dev/null
+++ b/tools/testing/fault-injection/failcmd.sh
@@ -0,0 +1,220 @@
+#!/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.txt 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"