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-rw-r--r--Documentation/fault-injection/failcmd.sh4
-rw-r--r--Documentation/fault-injection/failmodule.sh31
-rw-r--r--Documentation/fault-injection/fault-injection.txt105
3 files changed, 56 insertions, 84 deletions
diff --git a/Documentation/fault-injection/failcmd.sh b/Documentation/fault-injection/failcmd.sh
deleted file mode 100644
index 63177ab..0000000
--- a/Documentation/fault-injection/failcmd.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-
-echo 1 > /proc/self/make-it-fail
-exec $*
diff --git a/Documentation/fault-injection/failmodule.sh b/Documentation/fault-injection/failmodule.sh
deleted file mode 100644
index 474a8b9..0000000
--- a/Documentation/fault-injection/failmodule.sh
+++ /dev/null
@@ -1,31 +0,0 @@
-#!/bin/bash
-#
-# Usage: failmodule <failname> <modulename> [stacktrace-depth]
-#
-# <failname>: "failslab", "fail_alloc_page", or "fail_make_request"
-#
-# <modulename>: module name that you want to inject faults.
-#
-# [stacktrace-depth]: the maximum number of stacktrace walking allowed
-#
-
-STACKTRACE_DEPTH=5
-if [ $# -gt 2 ]; then
- STACKTRACE_DEPTH=$3
-fi
-
-if [ ! -d /debug/$1 ]; then
- echo "Fault-injection $1 does not exist" >&2
- exit 1
-fi
-if [ ! -d /sys/module/$2 ]; then
- echo "Module $2 does not exist" >&2
- exit 1
-fi
-
-# Disable any fault injection
-echo 0 > /debug/$1/stacktrace-depth
-
-echo `cat /sys/module/$2/sections/.text` > /debug/$1/require-start
-echo `cat /sys/module/$2/sections/.exit.text` > /debug/$1/require-end
-echo $STACKTRACE_DEPTH > /debug/$1/stacktrace-depth
diff --git a/Documentation/fault-injection/fault-injection.txt b/Documentation/fault-injection/fault-injection.txt
index 36ece09..4bc374a 100644
--- a/Documentation/fault-injection/fault-injection.txt
+++ b/Documentation/fault-injection/fault-injection.txt
@@ -161,70 +161,77 @@ o add a hook to insert failures
Application Examples
--------------------
-o inject slab allocation failures into module init/cleanup code
+o Inject slab allocation failures into module init/exit code
-------------------------------------------------------------------------------
#!/bin/bash
-FAILCMD=Documentation/fault-injection/failcmd.sh
-BLACKLIST="root_plug evbug"
-
-FAILNAME=failslab
-echo Y > /debug/$FAILNAME/task-filter
-echo 10 > /debug/$FAILNAME/probability
-echo 100 > /debug/$FAILNAME/interval
-echo -1 > /debug/$FAILNAME/times
-echo 2 > /debug/$FAILNAME/verbose
-echo 1 > /debug/$FAILNAME/ignore-gfp-wait
+FAILTYPE=failslab
+echo Y > /debug/$FAILTYPE/task-filter
+echo 10 > /debug/$FAILTYPE/probability
+echo 100 > /debug/$FAILTYPE/interval
+echo -1 > /debug/$FAILTYPE/times
+echo 0 > /debug/$FAILTYPE/space
+echo 2 > /debug/$FAILTYPE/verbose
+echo 1 > /debug/$FAILTYPE/ignore-gfp-wait
-blacklist()
+faulty_system()
{
- echo $BLACKLIST | grep $1 > /dev/null 2>&1
+ bash -c "echo 1 > /proc/self/make-it-fail && exec $*"
}
-oops()
-{
- dmesg | grep BUG > /dev/null 2>&1
-}
+if [ $# -eq 0 ]
+then
+ echo "Usage: $0 modulename [ modulename ... ]"
+ exit 1
+fi
+
+for m in $*
+do
+ echo inserting $m...
+ faulty_system modprobe $m
-find /lib/modules/`uname -r` -name '*.ko' -exec basename {} .ko \; |
- while read i
- do
- oops && exit 1
-
- if ! blacklist $i
- then
- echo inserting $i...
- bash $FAILCMD modprobe $i
- fi
- done
-
-lsmod | awk '{ if ($3 == 0) { print $1 } }' |
- while read i
- do
- oops && exit 1
-
- if ! blacklist $i
- then
- echo removing $i...
- bash $FAILCMD modprobe -r $i
- fi
- done
+ echo removing $m...
+ faulty_system modprobe -r $m
+done
------------------------------------------------------------------------------
-o inject slab allocation failures only for a specific module
+o Inject page allocation failures only for a specific module
-------------------------------------------------------------------------------
#!/bin/bash
-FAILMOD=Documentation/fault-injection/failmodule.sh
+FAILTYPE=fail_page_alloc
+module=$1
-echo injecting errors into the module $1...
+if [ -z $module ]
+then
+ echo "Usage: $0 <modulename>"
+ exit 1
+fi
-modprobe $1
-bash $FAILMOD failslab $1 10
-echo 25 > /debug/failslab/probability
+modprobe $module
-------------------------------------------------------------------------------
+if [ ! -d /sys/module/$module/sections ]
+then
+ echo Module $module is not loaded
+ exit 1
+fi
+
+cat /sys/module/$module/sections/.text > /debug/$FAILTYPE/require-start
+cat /sys/module/$module/sections/.data > /debug/$FAILTYPE/require-end
+
+echo N > /debug/$FAILTYPE/task-filter
+echo 10 > /debug/$FAILTYPE/probability
+echo 100 > /debug/$FAILTYPE/interval
+echo -1 > /debug/$FAILTYPE/times
+echo 0 > /debug/$FAILTYPE/space
+echo 2 > /debug/$FAILTYPE/verbose
+echo 1 > /debug/$FAILTYPE/ignore-gfp-wait
+echo 1 > /debug/$FAILTYPE/ignore-gfp-highmem
+echo 10 > /debug/$FAILTYPE/stacktrace-depth
+
+trap "echo 0 > /debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT
+
+echo "Injecting errors into the module $module... (interrupt to stop)"
+sleep 1000000
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