From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0F48C282E5 for ; Mon, 22 Apr 2019 13:35:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4CEE82064A for ; Mon, 22 Apr 2019 13:35:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555940145; bh=7saec6T4HhSKSPAybuzkATaAI0fYwi152lhKmwlvs9E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=T19Tg4RsTOBmcquXiAZ6iITKh5mBhm97Rcy3Y4bH2fuwtPl16pVLb2UtlWKJlpGhr oRMI4Rw7yXXm94ax9+ZtDWzXV0ObjuvOiA/43Mdqr6xZcoEeRxukNP1gVsUCGbrq17 Go15Ij9YVtDxz6A0KOChFGpT1LN++I2joBeVYx18= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728210AbfDVNfo (ORCPT ); Mon, 22 Apr 2019 09:35:44 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:36958 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727419AbfDVN2P (ORCPT ); Mon, 22 Apr 2019 09:28:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=e+8+X/iT/lrWGh5Cv0wn4saEsqEmc5Hh5ao46kW56qc=; b=dgWT4ucoqFq/lNC8IiOnDarZMe 1QP/OlTbjbfsPVXwDQ7nP0GNP+fv+Ujl968DtgXZvvCITchM+omjRZw3fBlC1vvbrSLNRZHRWmMlW p8qrwteZnDgX1m32IM5pWtWfGhqxq4uTlwNk9lv/GSRA0sQas0HVin0zOBwsCMCjhNqWT5O6qNEyo qJ8ViuodNB/Z0+moMAi39QaPU+099+Rdo3amVuWhDWPvNl9XMSmQ+KHZEh7Ej2I08QJe/aJ7KREJ2 EWHHTozfwu66vcxSW5EsSLsWlOGCpkijGWWo7co0eHU9l/CX4FvbuGRNTOL/ySVuZzCwHB4mm+wh1 pxKbUBJQ==; Received: from 179.176.125.229.dynamic.adsl.gvt.net.br ([179.176.125.229] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hIYzU-0005Hf-Ps; Mon, 22 Apr 2019 13:28:13 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92) (envelope-from ) id 1hIYzS-0005kJ-J8; Mon, 22 Apr 2019 10:28:10 -0300 From: Mauro Carvalho Chehab To: Linux Doc Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, Jonathan Corbet , Akinobu Mita , Federico Vaga , Harry Wei , Alex Shi , Kees Cook , Arnd Bergmann , Greg Kroah-Hartman Subject: [PATCH v2 12/79] docs: fault-injection: convert docs to ReST and rename to *.rst Date: Mon, 22 Apr 2019 10:27:01 -0300 Message-Id: <4a866538ad7527addac7797d7f6497d125af3fad.1555938376.git.mchehab+samsung@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The conversion is actually: - add blank lines and identation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab --- ...ault-injection.txt => fault-injection.rst} | 265 +++++++++--------- Documentation/fault-injection/index.rst | 20 ++ ...r-inject.txt => notifier-error-inject.rst} | 18 +- .../fault-injection/nvme-fault-injection.rst | 120 ++++++++ .../fault-injection/nvme-fault-injection.txt | 116 -------- .../fault-injection/provoke-crashes.rst | 48 ++++ .../fault-injection/provoke-crashes.txt | 38 --- Documentation/process/4.Coding.rst | 2 +- .../translations/it_IT/process/4.Coding.rst | 2 +- .../translations/zh_CN/process/4.Coding.rst | 2 +- drivers/misc/lkdtm/core.c | 2 +- include/linux/fault-inject.h | 2 +- lib/Kconfig.debug | 2 +- tools/testing/fault-injection/failcmd.sh | 2 +- 14 files changed, 344 insertions(+), 295 deletions(-) rename Documentation/fault-injection/{fault-injection.txt => fault-injection.rst} (68%) create mode 100644 Documentation/fault-injection/index.rst rename Documentation/fault-injection/{notifier-error-inject.txt => notifier-error-inject.rst} (83%) create mode 100644 Documentation/fault-injection/nvme-fault-injection.rst delete mode 100644 Documentation/fault-injection/nvme-fault-injection.txt create mode 100644 Documentation/fault-injection/provoke-crashes.rst delete mode 100644 Documentation/fault-injection/provoke-crashes.txt diff --git a/Documentation/fault-injection/fault-injection.txt b/Documentation/fault-injection/fault-injection.rst similarity index 68% rename from Documentation/fault-injection/fault-injection.txt rename to Documentation/fault-injection/fault-injection.rst index a17517a083c3..f51bb21d20e4 100644 --- a/Documentation/fault-injection/fault-injection.txt +++ b/Documentation/fault-injection/fault-injection.rst @@ -1,3 +1,4 @@ +=========================================== Fault injection capabilities infrastructure =========================================== @@ -7,36 +8,36 @@ See also drivers/md/md-faulty.c and "every_nth" module option for scsi_debug. Available fault injection capabilities -------------------------------------- -o failslab +- failslab injects slab allocation failures. (kmalloc(), kmem_cache_alloc(), ...) -o fail_page_alloc +- fail_page_alloc injects page allocation failures. (alloc_pages(), get_free_pages(), ...) -o fail_futex +- fail_futex injects futex deadlock and uaddr fault errors. -o fail_make_request +- fail_make_request injects disk IO errors on devices permitted by setting /sys/block//make-it-fail or /sys/block///make-it-fail. (generic_make_request()) -o fail_mmc_request +- 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 +- 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. -o NVMe fault injection +- NVMe fault injection inject NVMe status code and retry flag on devices permitted by setting debugfs entries under /sys/kernel/debug/nvme*/fault_inject. The default @@ -47,7 +48,8 @@ o NVMe fault injection Configure fault-injection capabilities behavior ----------------------------------------------- -o debugfs entries +debugfs entries +^^^^^^^^^^^^^^^ fault-inject-debugfs kernel module provides some debugfs entries for runtime configuration of fault-injection capabilities. @@ -55,6 +57,7 @@ configuration of fault-injection capabilities. - /sys/kernel/debug/fail*/probability: likelihood of failure injection, in percent. + Format: Note that one-failure-per-hundred is a very high error rate @@ -83,6 +86,7 @@ configuration of fault-injection capabilities. - /sys/kernel/debug/fail*/verbose Format: { 0 | 1 | 2 } + specifies the verbosity of the messages when failure is injected. '0' means no messages; '1' will print only a single log line per failure; '2' will print a call trace too -- useful @@ -91,14 +95,15 @@ configuration of fault-injection capabilities. - /sys/kernel/debug/fail*/task-filter: Format: { 'Y' | 'N' } + A value of 'N' disables filtering by process (default). Any positive value limits failures to only processes indicated by /proc//make-it-fail==1. -- /sys/kernel/debug/fail*/require-start: -- /sys/kernel/debug/fail*/require-end: -- /sys/kernel/debug/fail*/reject-start: -- /sys/kernel/debug/fail*/reject-end: +- /sys/kernel/debug/fail*/require-start, + /sys/kernel/debug/fail*/require-end, + /sys/kernel/debug/fail*/reject-start, + /sys/kernel/debug/fail*/reject-end: specifies the range of virtual addresses tested during stacktrace walking. Failure is injected only if some caller @@ -116,6 +121,7 @@ configuration of fault-injection capabilities. - /sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem: Format: { 'Y' | 'N' } + default is 'N', setting it to 'Y' won't inject failures into highmem/user allocations. @@ -123,6 +129,7 @@ configuration of fault-injection capabilities. - /sys/kernel/debug/fail_page_alloc/ignore-gfp-wait: Format: { 'Y' | 'N' } + default is 'N', setting it to 'Y' will inject failures only into non-sleep allocations (GFP_ATOMIC allocations). @@ -134,12 +141,14 @@ configuration of fault-injection capabilities. - /sys/kernel/debug/fail_futex/ignore-private: Format: { 'Y' | 'N' } + 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 ('') @@ -160,10 +169,11 @@ configuration of fault-injection capabilities. function for given function. This will be created when user specifies new injection entry. -o Boot option +Boot option +^^^^^^^^^^^ In order to inject faults while debugfs is not available (early boot time), -use the boot option: +use the boot option:: failslab= fail_page_alloc= @@ -171,10 +181,11 @@ use the boot option: fail_futex= mmc_core.fail_request=,,, -o proc entries +proc entries +^^^^^^^^^^^^ -- /proc//fail-nth: -- /proc/self/task//fail-nth: +- /proc//fail-nth, + /proc/self/task//fail-nth: Write to this file of integer N makes N-th call in the task fail. Read from this file returns a integer value. A value of '0' indicates @@ -191,16 +202,16 @@ o proc entries How to add new fault injection capability ----------------------------------------- -o #include +- #include -o define the fault attributes +- define the fault attributes DECLARE_FAULT_ATTR(name); Please see the definition of struct fault_attr in fault-inject.h for details. -o provide a way to configure fault attributes +- provide a way to configure fault attributes - boot option @@ -222,126 +233,126 @@ o provide a way to configure fault attributes single kernel module, it is better to provide module parameters to configure the fault attributes. -o add a hook to insert failures +- add a hook to insert failures - Upon should_fail() returning true, client code should inject a failure. + Upon should_fail() returning true, client code should inject a failure: should_fail(attr, size); Application Examples -------------------- -o Inject slab allocation failures into module init/exit code +- Inject slab allocation failures into module init/exit code:: -#!/bin/bash + #!/bin/bash -FAILTYPE=failslab -echo Y > /sys/kernel/debug/$FAILTYPE/task-filter -echo 10 > /sys/kernel/debug/$FAILTYPE/probability -echo 100 > /sys/kernel/debug/$FAILTYPE/interval -echo -1 > /sys/kernel/debug/$FAILTYPE/times -echo 0 > /sys/kernel/debug/$FAILTYPE/space -echo 2 > /sys/kernel/debug/$FAILTYPE/verbose -echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait + FAILTYPE=failslab + echo Y > /sys/kernel/debug/$FAILTYPE/task-filter + echo 10 > /sys/kernel/debug/$FAILTYPE/probability + echo 100 > /sys/kernel/debug/$FAILTYPE/interval + echo -1 > /sys/kernel/debug/$FAILTYPE/times + echo 0 > /sys/kernel/debug/$FAILTYPE/space + echo 2 > /sys/kernel/debug/$FAILTYPE/verbose + echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait -faulty_system() -{ + faulty_system() + { bash -c "echo 1 > /proc/self/make-it-fail && exec $*" -} + } -if [ $# -eq 0 ] -then + if [ $# -eq 0 ] + then echo "Usage: $0 modulename [ modulename ... ]" exit 1 -fi + fi -for m in $* -do + for m in $* + do echo inserting $m... faulty_system modprobe $m echo removing $m... faulty_system modprobe -r $m -done + done ------------------------------------------------------------------------------ -o Inject page allocation failures only for a specific module +- Inject page allocation failures only for a specific module:: -#!/bin/bash + #!/bin/bash -FAILTYPE=fail_page_alloc -module=$1 + FAILTYPE=fail_page_alloc + module=$1 -if [ -z $module ] -then + if [ -z $module ] + then echo "Usage: $0 " exit 1 -fi + fi -modprobe $module + modprobe $module -if [ ! -d /sys/module/$module/sections ] -then + if [ ! -d /sys/module/$module/sections ] + then echo Module $module is not loaded exit 1 -fi + fi -cat /sys/module/$module/sections/.text > /sys/kernel/debug/$FAILTYPE/require-start -cat /sys/module/$module/sections/.data > /sys/kernel/debug/$FAILTYPE/require-end + cat /sys/module/$module/sections/.text > /sys/kernel/debug/$FAILTYPE/require-start + cat /sys/module/$module/sections/.data > /sys/kernel/debug/$FAILTYPE/require-end -echo N > /sys/kernel/debug/$FAILTYPE/task-filter -echo 10 > /sys/kernel/debug/$FAILTYPE/probability -echo 100 > /sys/kernel/debug/$FAILTYPE/interval -echo -1 > /sys/kernel/debug/$FAILTYPE/times -echo 0 > /sys/kernel/debug/$FAILTYPE/space -echo 2 > /sys/kernel/debug/$FAILTYPE/verbose -echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait -echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-highmem -echo 10 > /sys/kernel/debug/$FAILTYPE/stacktrace-depth + echo N > /sys/kernel/debug/$FAILTYPE/task-filter + echo 10 > /sys/kernel/debug/$FAILTYPE/probability + echo 100 > /sys/kernel/debug/$FAILTYPE/interval + echo -1 > /sys/kernel/debug/$FAILTYPE/times + echo 0 > /sys/kernel/debug/$FAILTYPE/space + echo 2 > /sys/kernel/debug/$FAILTYPE/verbose + echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait + echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-highmem + echo 10 > /sys/kernel/debug/$FAILTYPE/stacktrace-depth -trap "echo 0 > /sys/kernel/debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT + trap "echo 0 > /sys/kernel/debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT -echo "Injecting errors into the module $module... (interrupt to stop)" -sleep 1000000 + echo "Injecting errors into the module $module... (interrupt to stop)" + sleep 1000000 ------------------------------------------------------------------------------ -o Inject open_ctree error while btrfs mount +- Inject open_ctree error while btrfs mount:: -#!/bin/bash + #!/bin/bash -rm -f testfile.img -dd if=/dev/zero of=testfile.img bs=1M seek=1000 count=1 -DEVICE=$(losetup --show -f testfile.img) -mkfs.btrfs -f $DEVICE -mkdir -p tmpmnt + rm -f testfile.img + dd if=/dev/zero of=testfile.img bs=1M seek=1000 count=1 + DEVICE=$(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 + 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 -mount -t btrfs $DEVICE tmpmnt -if [ $? -ne 0 ] -then + mount -t btrfs $DEVICE tmpmnt + if [ $? -ne 0 ] + then echo "SUCCESS!" -else + else echo "FAILED!" umount tmpmnt -fi + fi -echo > /sys/kernel/debug/$FAILTYPE/inject + echo > /sys/kernel/debug/$FAILTYPE/inject -rmdir tmpmnt -losetup -d $DEVICE -rm testfile.img + rmdir tmpmnt + losetup -d $DEVICE + rm testfile.img Tool to run command with failslab or fail_page_alloc @@ -354,43 +365,43 @@ see the following examples. Examples: Run a command "make -C tools/testing/selftests/ run_tests" with injecting slab -allocation failure. +allocation failure:: # ./tools/testing/fault-injection/failcmd.sh \ -- make -C tools/testing/selftests/ run_tests Same as above except to specify 100 times failures at most instead of one time -at most by default. +at most by default:: # ./tools/testing/fault-injection/failcmd.sh --times=100 \ -- make -C tools/testing/selftests/ run_tests Same as above except to inject page allocation failure instead of slab -allocation failure. +allocation failure:: # env FAILCMD_TYPE=fail_page_alloc \ ./tools/testing/fault-injection/failcmd.sh --times=100 \ - -- make -C tools/testing/selftests/ run_tests + -- make -C tools/testing/selftests/ run_tests Systematic faults using fail-nth --------------------------------- The following code systematically faults 0-th, 1-st, 2-nd and so on -capabilities in the socketpair() system call. +capabilities in the socketpair() system call:: -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include + #include + #include + #include + #include + #include + #include + #include + #include + #include + #include -int main() -{ + int main() + { int i, err, res, fail_nth, fds[2]; char buf[128]; @@ -413,23 +424,23 @@ int main() break; } return 0; -} + } -An example output: +An example output:: -1-th fault Y: res=-1/23 -2-th fault Y: res=-1/23 -3-th fault Y: res=-1/12 -4-th fault Y: res=-1/12 -5-th fault Y: res=-1/23 -6-th fault Y: res=-1/23 -7-th fault Y: res=-1/23 -8-th fault Y: res=-1/12 -9-th fault Y: res=-1/12 -10-th fault Y: res=-1/12 -11-th fault Y: res=-1/12 -12-th fault Y: res=-1/12 -13-th fault Y: res=-1/12 -14-th fault Y: res=-1/12 -15-th fault Y: res=-1/12 -16-th fault N: res=0/12 + 1-th fault Y: res=-1/23 + 2-th fault Y: res=-1/23 + 3-th fault Y: res=-1/12 + 4-th fault Y: res=-1/12 + 5-th fault Y: res=-1/23 + 6-th fault Y: res=-1/23 + 7-th fault Y: res=-1/23 + 8-th fault Y: res=-1/12 + 9-th fault Y: res=-1/12 + 10-th fault Y: res=-1/12 + 11-th fault Y: res=-1/12 + 12-th fault Y: res=-1/12 + 13-th fault Y: res=-1/12 + 14-th fault Y: res=-1/12 + 15-th fault Y: res=-1/12 + 16-th fault N: res=0/12 diff --git a/Documentation/fault-injection/index.rst b/Documentation/fault-injection/index.rst new file mode 100644 index 000000000000..92b5639ed07a --- /dev/null +++ b/Documentation/fault-injection/index.rst @@ -0,0 +1,20 @@ +:orphan: + +=============== +fault-injection +=============== + +.. toctree:: + :maxdepth: 1 + + fault-injection + notifier-error-inject + nvme-fault-injection + provoke-crashes + +.. only:: subproject and html + + Indices + ======= + + * :ref:`genindex` diff --git a/Documentation/fault-injection/notifier-error-inject.txt b/Documentation/fault-injection/notifier-error-inject.rst similarity index 83% rename from Documentation/fault-injection/notifier-error-inject.txt rename to Documentation/fault-injection/notifier-error-inject.rst index e861d761de24..1668b6e48d3a 100644 --- a/Documentation/fault-injection/notifier-error-inject.txt +++ b/Documentation/fault-injection/notifier-error-inject.rst @@ -14,7 +14,8 @@ modules that can be used to test the following notifiers. PM notifier error injection module ---------------------------------- This feature is controlled through debugfs interface -/sys/kernel/debug/notifier-error-inject/pm/actions//error + + /sys/kernel/debug/notifier-error-inject/pm/actions//error Possible PM notifier events to be failed are: @@ -22,7 +23,7 @@ Possible PM notifier events to be failed are: * PM_SUSPEND_PREPARE * PM_RESTORE_PREPARE -Example: Inject PM suspend error (-12 = -ENOMEM) +Example: Inject PM suspend error (-12 = -ENOMEM):: # cd /sys/kernel/debug/notifier-error-inject/pm/ # echo -12 > actions/PM_SUSPEND_PREPARE/error @@ -32,14 +33,15 @@ Example: Inject PM suspend error (-12 = -ENOMEM) Memory hotplug notifier error injection module ---------------------------------------------- This feature is controlled through debugfs interface -/sys/kernel/debug/notifier-error-inject/memory/actions//error + + /sys/kernel/debug/notifier-error-inject/memory/actions//error Possible memory notifier events to be failed are: * MEM_GOING_ONLINE * MEM_GOING_OFFLINE -Example: Inject memory hotplug offline error (-12 == -ENOMEM) +Example: Inject memory hotplug offline error (-12 == -ENOMEM):: # cd /sys/kernel/debug/notifier-error-inject/memory # echo -12 > actions/MEM_GOING_OFFLINE/error @@ -49,7 +51,8 @@ Example: Inject memory hotplug offline error (-12 == -ENOMEM) powerpc pSeries reconfig notifier error injection module -------------------------------------------------------- This feature is controlled through debugfs interface -/sys/kernel/debug/notifier-error-inject/pSeries-reconfig/actions//error + + /sys/kernel/debug/notifier-error-inject/pSeries-reconfig/actions//error Possible pSeries reconfig notifier events to be failed are: @@ -61,7 +64,8 @@ Possible pSeries reconfig notifier events to be failed are: Netdevice notifier error injection module ---------------------------------------------- This feature is controlled through debugfs interface -/sys/kernel/debug/notifier-error-inject/netdev/actions//error + + /sys/kernel/debug/notifier-error-inject/netdev/actions//error Netdevice notifier events which can be failed are: @@ -75,7 +79,7 @@ Netdevice notifier events which can be failed are: * NETDEV_PRECHANGEUPPER * NETDEV_CHANGEUPPER -Example: Inject netdevice mtu change error (-22 == -EINVAL) +Example: Inject netdevice mtu change error (-22 == -EINVAL):: # cd /sys/kernel/debug/notifier-error-inject/netdev # echo -22 > actions/NETDEV_CHANGEMTU/error diff --git a/Documentation/fault-injection/nvme-fault-injection.rst b/Documentation/fault-injection/nvme-fault-injection.rst new file mode 100644 index 000000000000..bbb1bf3e8650 --- /dev/null +++ b/Documentation/fault-injection/nvme-fault-injection.rst @@ -0,0 +1,120 @@ +NVMe Fault Injection +==================== +Linux's fault injection framework provides a systematic way to support +error injection via debugfs in the /sys/kernel/debug directory. When +enabled, the default NVME_SC_INVALID_OPCODE with no retry will be +injected into the nvme_end_request. Users can change the default status +code and no retry flag via the debugfs. The list of Generic Command +Status can be found in include/linux/nvme.h + +Following examples show how to inject an error into the nvme. + +First, enable CONFIG_FAULT_INJECTION_DEBUG_FS kernel config, +recompile the kernel. After booting up the kernel, do the +following. + +Example 1: Inject default status code with no retry +--------------------------------------------------- + +:: + + mount /dev/nvme0n1 /mnt + echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times + echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability + cp a.file /mnt + +Expected Result:: + + cp: cannot stat ‘/mnt/a.file’: Input/output error + +Message from dmesg:: + + FAULT_INJECTION: forcing a failure. + name fault_inject, interval 1, probability 100, space 0, times 1 + CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc8+ #2 + Hardware name: innotek GmbH VirtualBox/VirtualBox, + BIOS VirtualBox 12/01/2006 + Call Trace: + + dump_stack+0x5c/0x7d + should_fail+0x148/0x170 + nvme_should_fail+0x2f/0x50 [nvme_core] + nvme_process_cq+0xe7/0x1d0 [nvme] + nvme_irq+0x1e/0x40 [nvme] + __handle_irq_event_percpu+0x3a/0x190 + handle_irq_event_percpu+0x30/0x70 + handle_irq_event+0x36/0x60 + handle_fasteoi_irq+0x78/0x120 + handle_irq+0xa7/0x130 + ? tick_irq_enter+0xa8/0xc0 + do_IRQ+0x43/0xc0 + common_interrupt+0xa2/0xa2 + + RIP: 0010:native_safe_halt+0x2/0x10 + RSP: 0018:ffffffff82003e90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdd + RAX: ffffffff817a10c0 RBX: ffffffff82012480 RCX: 0000000000000000 + RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 + RBP: 0000000000000000 R08: 000000008e38ce64 R09: 0000000000000000 + R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82012480 + R13: ffffffff82012480 R14: 0000000000000000 R15: 0000000000000000 + ? __sched_text_end+0x4/0x4 + default_idle+0x18/0xf0 + do_idle+0x150/0x1d0 + cpu_startup_entry+0x6f/0x80 + start_kernel+0x4c4/0x4e4 + ? set_init_arg+0x55/0x55 + secondary_startup_64+0xa5/0xb0 + print_req_error: I/O error, dev nvme0n1, sector 9240 + EXT4-fs error (device nvme0n1): ext4_find_entry:1436: + inode #2: comm cp: reading directory lblock 0 + +Example 2: Inject default status code with retry +------------------------------------------------ + +:: + + mount /dev/nvme0n1 /mnt + echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times + echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability + echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/status + echo 0 > /sys/kernel/debug/nvme0n1/fault_inject/dont_retry + + cp a.file /mnt + +Expected Result:: + + command success without error + +Message from dmesg:: + + FAULT_INJECTION: forcing a failure. + name fault_inject, interval 1, probability 100, space 0, times 1 + CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc8+ #4 + Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 + Call Trace: + + dump_stack+0x5c/0x7d + should_fail+0x148/0x170 + nvme_should_fail+0x30/0x60 [nvme_core] + nvme_loop_queue_response+0x84/0x110 [nvme_loop] + nvmet_req_complete+0x11/0x40 [nvmet] + nvmet_bio_done+0x28/0x40 [nvmet] + blk_update_request+0xb0/0x310 + blk_mq_end_request+0x18/0x60 + flush_smp_call_function_queue+0x3d/0xf0 + smp_call_function_single_interrupt+0x2c/0xc0 + call_function_single_interrupt+0xa2/0xb0 + + RIP: 0010:native_safe_halt+0x2/0x10 + RSP: 0018:ffffc9000068bec0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04 + RAX: ffffffff817a10c0 RBX: ffff88011a3c9680 RCX: 0000000000000000 + RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 + RBP: 0000000000000001 R08: 000000008e38c131 R09: 0000000000000000 + R10: 0000000000000000 R11: 0000000000000000 R12: ffff88011a3c9680 + R13: ffff88011a3c9680 R14: 0000000000000000 R15: 0000000000000000 + ? __sched_text_end+0x4/0x4 + default_idle+0x18/0xf0 + do_idle+0x150/0x1d0 + cpu_startup_entry+0x6f/0x80 + start_secondary+0x187/0x1e0 + secondary_startup_64+0xa5/0xb0 diff --git a/Documentation/fault-injection/nvme-fault-injection.txt b/Documentation/fault-injection/nvme-fault-injection.txt deleted file mode 100644 index 8fbf3bf60b62..000000000000 --- a/Documentation/fault-injection/nvme-fault-injection.txt +++ /dev/null @@ -1,116 +0,0 @@ -NVMe Fault Injection -==================== -Linux's fault injection framework provides a systematic way to support -error injection via debugfs in the /sys/kernel/debug directory. When -enabled, the default NVME_SC_INVALID_OPCODE with no retry will be -injected into the nvme_end_request. Users can change the default status -code and no retry flag via the debugfs. The list of Generic Command -Status can be found in include/linux/nvme.h - -Following examples show how to inject an error into the nvme. - -First, enable CONFIG_FAULT_INJECTION_DEBUG_FS kernel config, -recompile the kernel. After booting up the kernel, do the -following. - -Example 1: Inject default status code with no retry ---------------------------------------------------- - -mount /dev/nvme0n1 /mnt -echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times -echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability -cp a.file /mnt - -Expected Result: - -cp: cannot stat ‘/mnt/a.file’: Input/output error - -Message from dmesg: - -FAULT_INJECTION: forcing a failure. -name fault_inject, interval 1, probability 100, space 0, times 1 -CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc8+ #2 -Hardware name: innotek GmbH VirtualBox/VirtualBox, -BIOS VirtualBox 12/01/2006 -Call Trace: - - dump_stack+0x5c/0x7d - should_fail+0x148/0x170 - nvme_should_fail+0x2f/0x50 [nvme_core] - nvme_process_cq+0xe7/0x1d0 [nvme] - nvme_irq+0x1e/0x40 [nvme] - __handle_irq_event_percpu+0x3a/0x190 - handle_irq_event_percpu+0x30/0x70 - handle_irq_event+0x36/0x60 - handle_fasteoi_irq+0x78/0x120 - handle_irq+0xa7/0x130 - ? tick_irq_enter+0xa8/0xc0 - do_IRQ+0x43/0xc0 - common_interrupt+0xa2/0xa2 - -RIP: 0010:native_safe_halt+0x2/0x10 -RSP: 0018:ffffffff82003e90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdd -RAX: ffffffff817a10c0 RBX: ffffffff82012480 RCX: 0000000000000000 -RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 -RBP: 0000000000000000 R08: 000000008e38ce64 R09: 0000000000000000 -R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82012480 -R13: ffffffff82012480 R14: 0000000000000000 R15: 0000000000000000 - ? __sched_text_end+0x4/0x4 - default_idle+0x18/0xf0 - do_idle+0x150/0x1d0 - cpu_startup_entry+0x6f/0x80 - start_kernel+0x4c4/0x4e4 - ? set_init_arg+0x55/0x55 - secondary_startup_64+0xa5/0xb0 - print_req_error: I/O error, dev nvme0n1, sector 9240 -EXT4-fs error (device nvme0n1): ext4_find_entry:1436: -inode #2: comm cp: reading directory lblock 0 - -Example 2: Inject default status code with retry ------------------------------------------------- - -mount /dev/nvme0n1 /mnt -echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/times -echo 100 > /sys/kernel/debug/nvme0n1/fault_inject/probability -echo 1 > /sys/kernel/debug/nvme0n1/fault_inject/status -echo 0 > /sys/kernel/debug/nvme0n1/fault_inject/dont_retry - -cp a.file /mnt - -Expected Result: - -command success without error - -Message from dmesg: - -FAULT_INJECTION: forcing a failure. -name fault_inject, interval 1, probability 100, space 0, times 1 -CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc8+ #4 -Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 -Call Trace: - - dump_stack+0x5c/0x7d - should_fail+0x148/0x170 - nvme_should_fail+0x30/0x60 [nvme_core] - nvme_loop_queue_response+0x84/0x110 [nvme_loop] - nvmet_req_complete+0x11/0x40 [nvmet] - nvmet_bio_done+0x28/0x40 [nvmet] - blk_update_request+0xb0/0x310 - blk_mq_end_request+0x18/0x60 - flush_smp_call_function_queue+0x3d/0xf0 - smp_call_function_single_interrupt+0x2c/0xc0 - call_function_single_interrupt+0xa2/0xb0 - -RIP: 0010:native_safe_halt+0x2/0x10 -RSP: 0018:ffffc9000068bec0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04 -RAX: ffffffff817a10c0 RBX: ffff88011a3c9680 RCX: 0000000000000000 -RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 -RBP: 0000000000000001 R08: 000000008e38c131 R09: 0000000000000000 -R10: 0000000000000000 R11: 0000000000000000 R12: ffff88011a3c9680 -R13: ffff88011a3c9680 R14: 0000000000000000 R15: 0000000000000000 - ? __sched_text_end+0x4/0x4 - default_idle+0x18/0xf0 - do_idle+0x150/0x1d0 - cpu_startup_entry+0x6f/0x80 - start_secondary+0x187/0x1e0 - secondary_startup_64+0xa5/0xb0 diff --git a/Documentation/fault-injection/provoke-crashes.rst b/Documentation/fault-injection/provoke-crashes.rst new file mode 100644 index 000000000000..9279a3e12278 --- /dev/null +++ b/Documentation/fault-injection/provoke-crashes.rst @@ -0,0 +1,48 @@ +=============== +Provoke crashes +=============== + +The lkdtm module provides an interface to crash or injure the kernel at +predefined crashpoints to evaluate the reliability of crash dumps obtained +using different dumping solutions. The module uses KPROBEs to instrument +crashing points, but can also crash the kernel directly without KRPOBE +support. + + +You can provide the way either through module arguments when inserting +the module, or through a debugfs interface. + +Usage:: + + insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<> + [cpoint_count={>0}] + +recur_count + Recursion level for the stack overflow test. Default is 10. + +cpoint_name + Crash point where the kernel is to be crashed. It can be + one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY, + FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD, + IDE_CORE_CP, DIRECT + +cpoint_type + Indicates the action to be taken on hitting the crash point. + It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW, + CORRUPT_STACK, UNALIGNED_LOAD_STORE_WRITE, OVERWRITE_ALLOCATION, + WRITE_AFTER_FREE, + +cpoint_count + Indicates the number of times the crash point is to be hit + to trigger an action. The default is 10. + +You can also induce failures by mounting debugfs and writing the type to +/provoke-crash/. E.g.:: + + mount -t debugfs debugfs /mnt + echo EXCEPTION > /mnt/provoke-crash/INT_HARDWARE_ENTRY + + +A special file is `DIRECT` which will induce the crash directly without +KPROBE instrumentation. This mode is the only one available when the module +is built on a kernel without KPROBEs support. diff --git a/Documentation/fault-injection/provoke-crashes.txt b/Documentation/fault-injection/provoke-crashes.txt deleted file mode 100644 index 7a9d3d81525b..000000000000 --- a/Documentation/fault-injection/provoke-crashes.txt +++ /dev/null @@ -1,38 +0,0 @@ -The lkdtm module provides an interface to crash or injure the kernel at -predefined crashpoints to evaluate the reliability of crash dumps obtained -using different dumping solutions. The module uses KPROBEs to instrument -crashing points, but can also crash the kernel directly without KRPOBE -support. - - -You can provide the way either through module arguments when inserting -the module, or through a debugfs interface. - -Usage: insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<> - [cpoint_count={>0}] - - recur_count : Recursion level for the stack overflow test. Default is 10. - - cpoint_name : Crash point where the kernel is to be crashed. It can be - one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY, - FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD, - IDE_CORE_CP, DIRECT - - cpoint_type : Indicates the action to be taken on hitting the crash point. - It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW, - CORRUPT_STACK, UNALIGNED_LOAD_STORE_WRITE, OVERWRITE_ALLOCATION, - WRITE_AFTER_FREE, - - cpoint_count : Indicates the number of times the crash point is to be hit - to trigger an action. The default is 10. - -You can also induce failures by mounting debugfs and writing the type to -/provoke-crash/. E.g., - - mount -t debugfs debugfs /mnt - echo EXCEPTION > /mnt/provoke-crash/INT_HARDWARE_ENTRY - - -A special file is `DIRECT' which will induce the crash directly without -KPROBE instrumentation. This mode is the only one available when the module -is built on a kernel without KPROBEs support. diff --git a/Documentation/process/4.Coding.rst b/Documentation/process/4.Coding.rst index 4b7a5ab3cec1..13dd893c9f88 100644 --- a/Documentation/process/4.Coding.rst +++ b/Documentation/process/4.Coding.rst @@ -298,7 +298,7 @@ enabled, a configurable percentage of memory allocations will be made to fail; these failures can be restricted to a specific range of code. Running with fault injection enabled allows the programmer to see how the code responds when things go badly. See -Documentation/fault-injection/fault-injection.txt for more information on +Documentation/fault-injection/fault-injection.rst for more information on how to use this facility. Other kinds of errors can be found with the "sparse" static analysis tool. diff --git a/Documentation/translations/it_IT/process/4.Coding.rst b/Documentation/translations/it_IT/process/4.Coding.rst index c05b89e616dd..a5e36aa60448 100644 --- a/Documentation/translations/it_IT/process/4.Coding.rst +++ b/Documentation/translations/it_IT/process/4.Coding.rst @@ -314,7 +314,7 @@ di allocazione di memoria sarà destinata al fallimento; questi fallimenti possono essere ridotti ad uno specifico pezzo di codice. Procedere con l'inserimento dei fallimenti attivo permette al programmatore di verificare come il codice risponde quando le cose vanno male. Consultate: -Documentation/fault-injection/fault-injection.txt per avere maggiori +Documentation/fault-injection/fault-injection.rst per avere maggiori informazioni su come utilizzare questo strumento. Altre tipologie di errori possono essere riscontrati con lo strumento di diff --git a/Documentation/translations/zh_CN/process/4.Coding.rst b/Documentation/translations/zh_CN/process/4.Coding.rst index 5301e9d55255..b8b6d4c8ef3c 100644 --- a/Documentation/translations/zh_CN/process/4.Coding.rst +++ b/Documentation/translations/zh_CN/process/4.Coding.rst @@ -205,7 +205,7 @@ Linus对这个问题给出了最佳答案: 启用故障注入后，内存分配的可配置百分比将失败；这些失败可以限制在特定的代码 范围内。在启用了故障注入的情况下运行，程序员可以看到当情况恶化时代码如何响 应。有关如何使用此工具的详细信息，请参阅 -Documentation/fault-injection/fault-injection.txt。 +Documentation/fault-injection/fault-injection.rst。 使用“sparse”静态分析工具可以发现其他类型的错误。对于sparse，可以警告程序员 用户空间和内核空间地址之间的混淆、big endian和small endian数量的混合、在需 diff --git a/drivers/misc/lkdtm/core.c b/drivers/misc/lkdtm/core.c index b51cf182b031..9c2f335b7023 100644 --- a/drivers/misc/lkdtm/core.c +++ b/drivers/misc/lkdtm/core.c @@ -28,7 +28,7 @@ * * Debugfs support added by Simon Kagstrom * - * See Documentation/fault-injection/provoke-crashes.txt for instructions + * See Documentation/fault-injection/provoke-crashes.rst for instructions */ #include "lkdtm.h" #include diff --git a/include/linux/fault-inject.h b/include/linux/fault-inject.h index 7e6c77740413..e525f6957c49 100644 --- a/include/linux/fault-inject.h +++ b/include/linux/fault-inject.h @@ -11,7 +11,7 @@ /* * For explanation of the elements of this struct, see - * Documentation/fault-injection/fault-injection.txt + * Documentation/fault-injection/fault-injection.rst */ struct fault_attr { unsigned long probability; diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 3a9d41bd4d45..1b0129196e70 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1681,7 +1681,7 @@ config LKDTM called lkdtm. Documentation on how to use the module can be found in - Documentation/fault-injection/provoke-crashes.txt + Documentation/fault-injection/provoke-crashes.rst config TEST_LIST_SORT tristate "Linked list sorting test" diff --git a/tools/testing/fault-injection/failcmd.sh b/tools/testing/fault-injection/failcmd.sh index 29a6c63c5a15..78dac34264be 100644 --- a/tools/testing/fault-injection/failcmd.sh +++ b/tools/testing/fault-injection/failcmd.sh @@ -42,7 +42,7 @@ OPTIONS --interval=value, --space=value, --verbose=value, --task-filter=value, --stacktrace-depth=value, --require-start=value, --require-end=value, --reject-start=value, --reject-end=value, --ignore-gfp-wait=value - See Documentation/fault-injection/fault-injection.txt for more + See Documentation/fault-injection/fault-injection.rst for more information failslab options: -- 2.20.1