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Date: Sat, 13 Jan 2018 22:28:29 +0900
From: Akinobu Mita <akinobu.mita@...il.com>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Alexei Starovoitov <ast@...com>, Josef Bacik <jbacik@...com>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
netdev <netdev@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>, ast@...nel.org,
kernel-team@...com, daniel@...earbox.net,
linux-btrfs@...r.kernel.org, darrick.wong@...cle.com,
Josef Bacik <josef@...icpanda.com>
Subject: Re: [PATCH bpf-next v5 5/5] error-injection: Support fault injection framework
2018-01-13 2:56 GMT+09:00 Masami Hiramatsu <mhiramat@...nel.org>:
> Support in-kernel fault-injection framework via debugfs.
> This allows you to inject a conditional error to specified
> function using debugfs interfaces.
>
> Here is the result of test script described in
> Documentation/fault-injection/fault-injection.txt
>
> ===========
> # ./test_fail_function.sh
> 1+0 records in
> 1+0 records out
> 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0227404 s, 46.1 MB/s
> btrfs-progs v4.4
> See http://btrfs.wiki.kernel.org for more information.
>
> Label: (null)
> UUID: bfa96010-12e9-4360-aed0-42eec7af5798
> Node size: 16384
> Sector size: 4096
> Filesystem size: 1001.00MiB
> Block group profiles:
> Data: single 8.00MiB
> Metadata: DUP 58.00MiB
> System: DUP 12.00MiB
> SSD detected: no
> Incompat features: extref, skinny-metadata
> Number of devices: 1
> Devices:
> ID SIZE PATH
> 1 1001.00MiB /dev/loop2
>
> mount: mount /dev/loop2 on /opt/tmpmnt failed: Cannot allocate memory
> SUCCESS!
> ===========
>
>
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> Reviewed-by: Josef Bacik <jbacik@...com>
> ---
> Changes in v3:
> - Check and adjust error value for each target function
> - Clear kporbe flag for reuse
> - Add more documents and example
> Changes in v5:
> - Support multi-function error injection
> ---
> Documentation/fault-injection/fault-injection.txt | 68 ++++
> kernel/Makefile | 1
> kernel/fail_function.c | 349 +++++++++++++++++++++
> lib/Kconfig.debug | 10 +
> 4 files changed, 428 insertions(+)
> create mode 100644 kernel/fail_function.c
>
> diff --git a/Documentation/fault-injection/fault-injection.txt b/Documentation/fault-injection/fault-injection.txt
> index 918972babcd8..f4a32463ca48 100644
> --- a/Documentation/fault-injection/fault-injection.txt
> +++ b/Documentation/fault-injection/fault-injection.txt
> @@ -30,6 +30,12 @@ o fail_mmc_request
> injects MMC data errors on devices permitted by setting
> debugfs entries under /sys/kernel/debug/mmc0/fail_mmc_request
>
> +o fail_function
> +
> + injects error return on specific functions, which are marked by
> + ALLOW_ERROR_INJECTION() macro, by setting debugfs entries
> + under /sys/kernel/debug/fail_function. No boot option supported.
> +
> Configure fault-injection capabilities behavior
> -----------------------------------------------
>
> @@ -123,6 +129,29 @@ configuration of fault-injection capabilities.
> default is 'N', setting it to 'Y' will disable failure injections
> when dealing with private (address space) futexes.
>
> +- /sys/kernel/debug/fail_function/inject:
> +
> + Format: { 'function-name' | '!function-name' | '' }
> + specifies the target function of error injection by name.
> + If the function name leads '!' prefix, given function is
> + removed from injection list. If nothing specified ('')
> + injection list is cleared.
> +
> +- /sys/kernel/debug/fail_function/injectable:
> +
> + (read only) shows error injectable functions and what type of
> + error values can be specified. The error type will be one of
> + below;
> + - NULL: retval must be 0.
> + - ERRNO: retval must be -1 to -MAX_ERRNO (-4096).
> + - ERR_NULL: retval must be 0 or -1 to -MAX_ERRNO (-4096).
> +
> +- /sys/kernel/debug/fail_function/<functiuon-name>/retval:
> +
> + specifies the "error" return value to inject to the given
> + function for given function. This will be created when
> + user specifies new injection entry.
> +
> o Boot option
>
> In order to inject faults while debugfs is not available (early boot time),
> @@ -268,6 +297,45 @@ trap "echo 0 > /sys/kernel/debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT
> echo "Injecting errors into the module $module... (interrupt to stop)"
> sleep 1000000
>
> +------------------------------------------------------------------------------
> +
> +o Inject open_ctree error while btrfs mount
> +
> +#!/bin/bash
> +
> +rm -f testfile.img
> +dd if=/dev/zero of=testfile.img bs=1M seek=1000 count=1
> +DEVICE=$(losetup --show -f testfile.img)
> +mkfs.btrfs -f $DEVICE
> +mkdir -p tmpmnt
> +
> +FAILTYPE=fail_function
> +FAILFUNC=open_ctree
> +echo $FAILFUNC > /sys/kernel/debug/$FAILTYPE/inject
> +echo -12 > /sys/kernel/debug/$FAILTYPE/$FAILFUNC/retval
> +echo N > /sys/kernel/debug/$FAILTYPE/task-filter
> +echo 100 > /sys/kernel/debug/$FAILTYPE/probability
> +echo 0 > /sys/kernel/debug/$FAILTYPE/interval
> +echo -1 > /sys/kernel/debug/$FAILTYPE/times
> +echo 0 > /sys/kernel/debug/$FAILTYPE/space
> +echo 1 > /sys/kernel/debug/$FAILTYPE/verbose
I expected that the fault_attr is created for each target function.
(i.e. /sys/kernel/debug/fail_function/<func>/ directory contains not
only 'retval', but also 'probability', 'interval', ...)
Or is there any good reason to share a single fault_attr for all
error injected functions?
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