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1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# NAME
5# failcmd.sh - run a command with injecting slab/page allocation failures
6#
7# SYNOPSIS
8# failcmd.sh --help
9# failcmd.sh [<options>] command [arguments]
10#
11# DESCRIPTION
12# Run command with injecting slab/page allocation failures by fault
13# injection.
14#
15# NOTE: you need to run this script as root.
16#
17
18usage()
19{
20 cat >&2 <<EOF
21Usage: $0 [options] command [arguments]
22
23OPTIONS
24 -p percent
25 --probability=percent
26 likelihood of failure injection, in percent.
27 Default value is 1
28
29 -t value
30 --times=value
31 specifies how many times failures may happen at most.
32 Default value is 1
33
34 --oom-kill-allocating-task=value
35 set /proc/sys/vm/oom_kill_allocating_task to specified value
36 before running the command.
37 Default value is 1
38
39 -h, --help
40 Display a usage message and exit
41
42 --interval=value, --space=value, --verbose=value, --task-filter=value,
43 --stacktrace-depth=value, --require-start=value, --require-end=value,
44 --reject-start=value, --reject-end=value, --ignore-gfp-wait=value
45 See Documentation/fault-injection/fault-injection.rst for more
46 information
47
48 failslab options:
49 --cache-filter=value
50
51 fail_page_alloc options:
52 --ignore-gfp-highmem=value, --min-order=value
53
54ENVIRONMENT
55 FAILCMD_TYPE
56 The following values for FAILCMD_TYPE are recognized:
57
58 failslab
59 inject slab allocation failures
60 fail_page_alloc
61 inject page allocation failures
62
63 If FAILCMD_TYPE is not defined, then failslab is used.
64EOF
65}
66
67exit_if_not_hex() {
68 local value="$1"
69 if ! [[ $value =~ ^0x[0-9a-fA-F]+$ ]]; then
70 echo "Error: The provided value '$value' is not a valid hexadecimal number." >&2
71 exit 1
72 fi
73}
74
75if [ $UID != 0 ]; then
76 echo must be run as root >&2
77 exit 1
78fi
79
80DEBUGFS=`mount -t debugfs | head -1 | awk '{ print $3}'`
81
82if [ ! -d "$DEBUGFS" ]; then
83 echo debugfs is not mounted >&2
84 exit 1
85fi
86
87FAILCMD_TYPE=${FAILCMD_TYPE:-failslab}
88FAULTATTR=$DEBUGFS/$FAILCMD_TYPE
89
90if [ ! -d $FAULTATTR ]; then
91 echo $FAILCMD_TYPE is not available >&2
92 exit 1
93fi
94
95LONGOPTS=probability:,interval:,times:,space:,verbose:,task-filter:
96LONGOPTS=$LONGOPTS,stacktrace-depth:,require-start:,require-end:
97LONGOPTS=$LONGOPTS,reject-start:,reject-end:,oom-kill-allocating-task:,help
98
99if [ $FAILCMD_TYPE = failslab ]; then
100 LONGOPTS=$LONGOPTS,ignore-gfp-wait:,cache-filter:
101elif [ $FAILCMD_TYPE = fail_page_alloc ]; then
102 LONGOPTS=$LONGOPTS,ignore-gfp-wait:,ignore-gfp-highmem:,min-order:
103fi
104
105TEMP=`getopt -o p:i:t:s:v:h --long $LONGOPTS -n 'failcmd.sh' -- "$@"`
106
107if [ $? != 0 ]; then
108 usage
109 exit 1
110fi
111
112eval set -- "$TEMP"
113
114fault_attr_default()
115{
116 echo N > $FAULTATTR/task-filter
117 echo 0 > $FAULTATTR/probability
118 echo 1 > $FAULTATTR/times
119}
120
121fault_attr_default
122
123oom_kill_allocating_task_saved=`cat /proc/sys/vm/oom_kill_allocating_task`
124
125restore_values()
126{
127 fault_attr_default
128 echo $oom_kill_allocating_task_saved \
129 > /proc/sys/vm/oom_kill_allocating_task
130}
131
132#
133# Default options
134#
135declare -i oom_kill_allocating_task=1
136declare task_filter=Y
137declare -i probability=1
138declare -i times=1
139
140while true; do
141 case "$1" in
142 -p|--probability)
143 probability=$2
144 shift 2
145 ;;
146 -i|--interval)
147 echo $2 > $FAULTATTR/interval
148 shift 2
149 ;;
150 -t|--times)
151 times=$2
152 shift 2
153 ;;
154 -s|--space)
155 echo $2 > $FAULTATTR/space
156 shift 2
157 ;;
158 -v|--verbose)
159 echo $2 > $FAULTATTR/verbose
160 shift 2
161 ;;
162 --task-filter)
163 task_filter=$2
164 shift 2
165 ;;
166 --stacktrace-depth)
167 echo $2 > $FAULTATTR/stacktrace-depth
168 shift 2
169 ;;
170 --require-start)
171 exit_if_not_hex "$2"
172 echo $2 > $FAULTATTR/require-start
173 shift 2
174 ;;
175 --require-end)
176 exit_if_not_hex "$2"
177 echo $2 > $FAULTATTR/require-end
178 shift 2
179 ;;
180 --reject-start)
181 exit_if_not_hex "$2"
182 echo $2 > $FAULTATTR/reject-start
183 shift 2
184 ;;
185 --reject-end)
186 exit_if_not_hex "$2"
187 echo $2 > $FAULTATTR/reject-end
188 shift 2
189 ;;
190 --oom-kill-allocating-task)
191 oom_kill_allocating_task=$2
192 shift 2
193 ;;
194 --ignore-gfp-wait)
195 echo $2 > $FAULTATTR/ignore-gfp-wait
196 shift 2
197 ;;
198 --cache-filter)
199 echo $2 > $FAULTATTR/cache_filter
200 shift 2
201 ;;
202 --ignore-gfp-highmem)
203 echo $2 > $FAULTATTR/ignore-gfp-highmem
204 shift 2
205 ;;
206 --min-order)
207 echo $2 > $FAULTATTR/min-order
208 shift 2
209 ;;
210 -h|--help)
211 usage
212 exit 0
213 shift
214 ;;
215 --)
216 shift
217 break
218 ;;
219 esac
220done
221
222[ -z "$1" ] && exit 0
223
224echo $oom_kill_allocating_task > /proc/sys/vm/oom_kill_allocating_task
225echo $task_filter > $FAULTATTR/task-filter
226echo $probability > $FAULTATTR/probability
227echo $times > $FAULTATTR/times
228
229trap "restore_values" SIGINT SIGTERM EXIT
230
231cmd="echo 1 > /proc/self/make-it-fail && exec $@"
232bash -c "$cmd"