summaryrefslogtreecommitdiffstats
path: root/tools/testing/fault-injection/failcmd.sh
blob: 78dac34264be9b9079223360a8a9b859c2ce72fa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
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.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"