fault-injection: fix example scripts in documentation
Fix and cleanup example scripts in fault injection documentation. 1. Eliminate broken oops() shell function. 2. Fold failcmd.sh and failmodule.sh into example scripts. It makes the example scripts work independent of current working directory. 3. Set "space" parameter to 0 to start injecting errors immediately. 4. Use /sys/module/<modulename>/sections/.data as upper bound of .text section. Because some module doesn't have .exit.text section. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita
Linus Torvalds
parent
54114994f4
commit
185848707e
3 changed files with 55 additions and 83 deletions
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@ -1,4 +0,0 @@
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#!/bin/bash
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echo 1 > /proc/self/make-it-fail
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exec $*
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@ -1,31 +0,0 @@
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#!/bin/bash
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#
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# Usage: failmodule <failname> <modulename> [stacktrace-depth]
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#
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# <failname>: "failslab", "fail_alloc_page", or "fail_make_request"
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#
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# <modulename>: module name that you want to inject faults.
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#
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# [stacktrace-depth]: the maximum number of stacktrace walking allowed
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#
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STACKTRACE_DEPTH=5
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if [ $# -gt 2 ]; then
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STACKTRACE_DEPTH=$3
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fi
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if [ ! -d /debug/$1 ]; then
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echo "Fault-injection $1 does not exist" >&2
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exit 1
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fi
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if [ ! -d /sys/module/$2 ]; then
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echo "Module $2 does not exist" >&2
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exit 1
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fi
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# Disable any fault injection
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echo 0 > /debug/$1/stacktrace-depth
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echo `cat /sys/module/$2/sections/.text` > /debug/$1/require-start
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echo `cat /sys/module/$2/sections/.exit.text` > /debug/$1/require-end
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echo $STACKTRACE_DEPTH > /debug/$1/stacktrace-depth
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@ -161,70 +161,77 @@ o add a hook to insert failures
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Application Examples
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--------------------
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o inject slab allocation failures into module init/cleanup code
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o Inject slab allocation failures into module init/exit code
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------------------------------------------------------------------------------
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#!/bin/bash
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FAILCMD=Documentation/fault-injection/failcmd.sh
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BLACKLIST="root_plug evbug"
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FAILTYPE=failslab
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echo Y > /debug/$FAILTYPE/task-filter
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echo 10 > /debug/$FAILTYPE/probability
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echo 100 > /debug/$FAILTYPE/interval
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echo -1 > /debug/$FAILTYPE/times
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echo 0 > /debug/$FAILTYPE/space
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echo 2 > /debug/$FAILTYPE/verbose
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echo 1 > /debug/$FAILTYPE/ignore-gfp-wait
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FAILNAME=failslab
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echo Y > /debug/$FAILNAME/task-filter
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echo 10 > /debug/$FAILNAME/probability
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echo 100 > /debug/$FAILNAME/interval
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echo -1 > /debug/$FAILNAME/times
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echo 2 > /debug/$FAILNAME/verbose
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echo 1 > /debug/$FAILNAME/ignore-gfp-wait
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blacklist()
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faulty_system()
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{
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echo $BLACKLIST | grep $1 > /dev/null 2>&1
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bash -c "echo 1 > /proc/self/make-it-fail && exec $*"
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}
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oops()
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{
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dmesg | grep BUG > /dev/null 2>&1
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}
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if [ $# -eq 0 ]
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then
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echo "Usage: $0 modulename [ modulename ... ]"
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exit 1
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fi
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find /lib/modules/`uname -r` -name '*.ko' -exec basename {} .ko \; |
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while read i
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do
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oops && exit 1
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for m in $*
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do
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echo inserting $m...
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faulty_system modprobe $m
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if ! blacklist $i
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then
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echo inserting $i...
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bash $FAILCMD modprobe $i
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fi
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done
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lsmod | awk '{ if ($3 == 0) { print $1 } }' |
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while read i
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do
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oops && exit 1
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if ! blacklist $i
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then
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echo removing $i...
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bash $FAILCMD modprobe -r $i
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fi
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done
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echo removing $m...
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faulty_system modprobe -r $m
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done
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------------------------------------------------------------------------------
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o inject slab allocation failures only for a specific module
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o Inject page allocation failures only for a specific module
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------------------------------------------------------------------------------
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#!/bin/bash
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FAILMOD=Documentation/fault-injection/failmodule.sh
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FAILTYPE=fail_page_alloc
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module=$1
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echo injecting errors into the module $1...
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if [ -z $module ]
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then
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echo "Usage: $0 <modulename>"
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exit 1
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fi
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modprobe $1
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bash $FAILMOD failslab $1 10
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echo 25 > /debug/failslab/probability
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modprobe $module
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------------------------------------------------------------------------------
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if [ ! -d /sys/module/$module/sections ]
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then
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echo Module $module is not loaded
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exit 1
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fi
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cat /sys/module/$module/sections/.text > /debug/$FAILTYPE/require-start
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cat /sys/module/$module/sections/.data > /debug/$FAILTYPE/require-end
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echo N > /debug/$FAILTYPE/task-filter
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echo 10 > /debug/$FAILTYPE/probability
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echo 100 > /debug/$FAILTYPE/interval
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echo -1 > /debug/$FAILTYPE/times
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echo 0 > /debug/$FAILTYPE/space
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echo 2 > /debug/$FAILTYPE/verbose
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echo 1 > /debug/$FAILTYPE/ignore-gfp-wait
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echo 1 > /debug/$FAILTYPE/ignore-gfp-highmem
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echo 10 > /debug/$FAILTYPE/stacktrace-depth
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trap "echo 0 > /debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT
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echo "Injecting errors into the module $module... (interrupt to stop)"
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sleep 1000000
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