tools/testing/fault-injection/failcmd.sh

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