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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"
|
