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de1ba09b21
This patch set provides some fault-injection capabilities.
- kmalloc() failures
- alloc_pages() failures
- disk IO errors
We can see what really happens if those failures happen.
In order to enable these fault-injection capabilities:
1. Enable relevant config options (CONFIG_FAILSLAB, CONFIG_PAGE_ALLOC,
CONFIG_MAKE_REQUEST) and if you want to configure them via debugfs,
enable CONFIG_FAULT_INJECTION_DEBUG_FS.
2. Build and boot with this kernel
3. Configure fault-injection capabilities behavior by boot option or debugfs
- Boot option
failslab=
fail_page_alloc=
fail_make_request=
- Debugfs
/debug/failslab/*
/debug/fail_page_alloc/*
/debug/fail_make_request/*
Please refer to the Documentation/fault-injection/fault-injection.txt
for details.
4. See what really happens.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Don Mullis <dwm@meer.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
31 lines
774 B
Bash
31 lines
774 B
Bash
#!/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/address-start
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echo `cat /sys/module/$2/sections/.exit.text` > /debug/$1/address-end
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echo $STACKTRACE_DEPTH > /debug/$1/stacktrace-depth
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