xref: /linux/tools/testing/ktest/sample.conf (revision 492c826b9facefa84995f4dea917e301b5ee0884)
1#
2# Config file for ktest.pl
3#
4# Note, all paths must be absolute
5#
6
7# Options set in the beginning of the file are considered to be
8# default options. These options can be overriden by test specific
9# options, with the following exceptions:
10#
11#  LOG_FILE
12#  CLEAR_LOG
13#  POWEROFF_ON_SUCCESS
14#  REBOOT_ON_SUCCESS
15#
16# Test specific options are set after the label:
17#
18# TEST_START
19#
20# The options after a TEST_START label are specific to that test.
21# Each TEST_START label will set up a new test. If you want to
22# perform a test more than once, you can add the ITERATE label
23# to it followed by the number of times you want that test
24# to iterate. If the ITERATE is left off, the test will only
25# be performed once.
26#
27# TEST_START ITERATE 10
28#
29# You can skip a test by adding SKIP (before or after the ITERATE
30# and number)
31#
32# TEST_START SKIP
33#
34# TEST_START SKIP ITERATE 10
35#
36# TEST_START ITERATE 10 SKIP
37#
38# The SKIP label causes the options and the test itself to be ignored.
39# This is useful to set up several different tests in one config file, and
40# only enabling the ones you want to use for a current test run.
41#
42# You can add default options anywhere in the file as well
43# with the DEFAULTS tag. This allows you to have default options
44# after the test options to keep the test options at the top
45# of the file. You can even place the DEFAULTS tag between
46# test cases (but not in the middle of a single test case)
47#
48# TEST_START
49# MIN_CONFIG = /home/test/config-test1
50#
51# DEFAULTS
52# MIN_CONFIG = /home/test/config-default
53#
54# TEST_START ITERATE 10
55#
56# The above will run the first test with MIN_CONFIG set to
57# /home/test/config-test-1. Then 10 tests will be executed
58# with MIN_CONFIG with /home/test/config-default.
59#
60# You can also disable defaults with the SKIP option
61#
62# DEFAULTS SKIP
63# MIN_CONFIG = /home/test/config-use-sometimes
64#
65# DEFAULTS
66# MIN_CONFIG = /home/test/config-most-times
67#
68# The above will ignore the first MIN_CONFIG. If you want to
69# use the first MIN_CONFIG, remove the SKIP from the first
70# DEFAULTS tag and add it to the second. Be careful, options
71# may only be declared once per test or default. If you have
72# the same option name under the same test or as default
73# ktest will fail to execute, and no tests will run.
74#
75
76#### Config variables ####
77#
78# This config file can also contain "config variables".
79# These are assigned with ":=" instead of the ktest option
80# assigment "=".
81#
82# The difference between ktest options and config variables
83# is that config variables can be used multiple times,
84# where each instance will override the previous instance.
85# And that they only live at time of processing this config.
86#
87# The advantage to config variables are that they can be used
88# by any option or any other config variables to define thing
89# that you may use over and over again in the options.
90#
91# For example:
92#
93# USER      := root
94# TARGET    := mybox
95# TEST_CASE := ssh ${USER}@${TARGET} /path/to/my/test
96#
97# TEST_START
98# MIN_CONFIG = config1
99# TEST = ${TEST_CASE}
100#
101# TEST_START
102# MIN_CONFIG = config2
103# TEST = ${TEST_CASE}
104#
105# TEST_CASE := ssh ${USER}@${TARGET} /path/to/my/test2
106#
107# TEST_START
108# MIN_CONFIG = config1
109# TEST = ${TEST_CASE}
110#
111# TEST_START
112# MIN_CONFIG = config2
113# TEST = ${TEST_CASE}
114#
115# TEST_DIR := /home/me/test
116#
117# BUILD_DIR = ${TEST_DIR}/linux.git
118# OUTPUT_DIR = ${TEST_DIR}/test
119#
120# Note, the config variables are evaluated immediately, thus
121# updating TARGET after TEST_CASE has been assigned does nothing
122# to TEST_CASE.
123#
124# As shown in the example, to evaluate a config variable, you
125# use the ${X} convention. Simple $X will not work.
126#
127# If the config variable does not exist, the ${X} will not
128# be evaluated. Thus:
129#
130# MAKE_CMD = PATH=/mypath:${PATH} make
131#
132# If PATH is not a config variable, then the ${PATH} in
133# the MAKE_CMD option will be evaluated by the shell when
134# the MAKE_CMD option is passed into shell processing.
135
136#### Using options in other options ####
137#
138# Options that are defined in the config file may also be used
139# by other options. All options are evaulated at time of
140# use (except that config variables are evaluated at config
141# processing time).
142#
143# If an ktest option is used within another option, instead of
144# typing it again in that option you can simply use the option
145# just like you can config variables.
146#
147# MACHINE = mybox
148#
149# TEST = ssh root@${MACHINE} /path/to/test
150#
151# The option will be used per test case. Thus:
152#
153# TEST_TYPE = test
154# TEST = ssh root@{MACHINE}
155#
156# TEST_START
157# MACHINE = box1
158#
159# TEST_START
160# MACHINE = box2
161#
162# For both test cases, MACHINE will be evaluated at the time
163# of the test case. The first test will run ssh root@box1
164# and the second will run ssh root@box2.
165
166#### Mandatory Default Options ####
167
168# These options must be in the default section, although most
169# may be overridden by test options.
170
171# The machine hostname that you will test
172#MACHINE = target
173
174# The box is expected to have ssh on normal bootup, provide the user
175#  (most likely root, since you need privileged operations)
176#SSH_USER = root
177
178# The directory that contains the Linux source code
179#BUILD_DIR = /home/test/linux.git
180
181# The directory that the objects will be built
182# (can not be same as BUILD_DIR)
183#OUTPUT_DIR = /home/test/build/target
184
185# The location of the compiled file to copy to the target
186# (relative to OUTPUT_DIR)
187#BUILD_TARGET = arch/x86/boot/bzImage
188
189# The place to put your image on the test machine
190#TARGET_IMAGE = /boot/vmlinuz-test
191
192# A script or command to reboot the box
193#
194# Here is a digital loggers power switch example
195#POWER_CYCLE = wget --no-proxy -O /dev/null -q  --auth-no-challenge 'http://admin:admin@power/outlet?5=CCL'
196#
197# Here is an example to reboot a virtual box on the current host
198# with the name "Guest".
199#POWER_CYCLE = virsh destroy Guest; sleep 5; virsh start Guest
200
201# The script or command that reads the console
202#
203#  If you use ttywatch server, something like the following would work.
204#CONSOLE = nc -d localhost 3001
205#
206# For a virtual machine with guest name "Guest".
207#CONSOLE =  virsh console Guest
208
209# Required version ending to differentiate the test
210# from other linux builds on the system.
211#LOCALVERSION = -test
212
213# The grub title name for the test kernel to boot
214# (Only mandatory if REBOOT_TYPE = grub)
215#
216# Note, ktest.pl will not update the grub menu.lst, you need to
217# manually add an option for the test. ktest.pl will search
218# the grub menu.lst for this option to find what kernel to
219# reboot into.
220#
221# For example, if in the /boot/grub/menu.lst the test kernel title has:
222# title Test Kernel
223# kernel vmlinuz-test
224#GRUB_MENU = Test Kernel
225
226# A script to reboot the target into the test kernel
227# (Only mandatory if REBOOT_TYPE = script)
228#REBOOT_SCRIPT =
229
230#### Optional Config Options (all have defaults) ####
231
232# Start a test setup. If you leave this off, all options
233# will be default and the test will run once.
234# This is a label and not really an option (it takes no value).
235# You can append ITERATE and a number after it to iterate the
236# test a number of times, or SKIP to ignore this test.
237#
238#TEST_START
239#TEST_START ITERATE 5
240#TEST_START SKIP
241
242# Have the following options as default again. Used after tests
243# have already been defined by TEST_START. Optionally, you can
244# just define all default options before the first TEST_START
245# and you do not need this option.
246#
247# This is a label and not really an option (it takes no value).
248# You can append SKIP to this label and the options within this
249# section will be ignored.
250#
251# DEFAULTS
252# DEFAULTS SKIP
253
254# The default test type (default test)
255# The test types may be:
256#   build - only build the kernel, do nothing else
257#   boot - build and boot the kernel
258#   test - build, boot and if TEST is set, run the test script
259#          (If TEST is not set, it defaults back to boot)
260#   bisect - Perform a bisect on the kernel (see BISECT_TYPE below)
261#   patchcheck - Do a test on a series of commits in git (see PATCHCHECK below)
262#TEST_TYPE = test
263
264# Test to run if there is a successful boot and TEST_TYPE is test.
265# Must exit with 0 on success and non zero on error
266# default (undefined)
267#TEST = ssh user@machine /root/run_test
268
269# The build type is any make config type or special command
270#  (default randconfig)
271#   nobuild - skip the clean and build step
272#   useconfig:/path/to/config - use the given config and run
273#              oldconfig on it.
274# This option is ignored if TEST_TYPE is patchcheck or bisect
275#BUILD_TYPE = randconfig
276
277# The make command (default make)
278# If you are building a 32bit x86 on a 64 bit host
279#MAKE_CMD = CC=i386-gcc AS=i386-as make ARCH=i386
280
281# Any build options for the make of the kernel (not for other makes, like configs)
282# (default "")
283#BUILD_OPTIONS = -j20
284
285# If you need an initrd, you can add a script or code here to install
286# it. The environment variable KERNEL_VERSION will be set to the
287# kernel version that is used. Remember to add the initrd line
288# to your grub menu.lst file.
289#
290# Here's a couple of examples to use:
291#POST_INSTALL = ssh user@target /sbin/mkinitrd --allow-missing -f /boot/initramfs-test.img $KERNEL_VERSION
292#
293# or on some systems:
294#POST_INSTALL = ssh user@target /sbin/dracut -f /boot/initramfs-test.img $KERNEL_VERSION
295
296# Way to reboot the box to the test kernel.
297# Only valid options so far are "grub" and "script"
298# (default grub)
299# If you specify grub, it will assume grub version 1
300# and will search in /boot/grub/menu.lst for the title $GRUB_MENU
301# and select that target to reboot to the kernel. If this is not
302# your setup, then specify "script" and have a command or script
303# specified in REBOOT_SCRIPT to boot to the target.
304#
305# The entry in /boot/grub/menu.lst must be entered in manually.
306# The test will not modify that file.
307#REBOOT_TYPE = grub
308
309# The min config that is needed to build for the machine
310# A nice way to create this is with the following:
311#
312#   $ ssh target
313#   $ lsmod > mymods
314#   $ scp mymods host:/tmp
315#   $ exit
316#   $ cd linux.git
317#   $ rm .config
318#   $ make LSMOD=mymods localyesconfig
319#   $ grep '^CONFIG' .config > /home/test/config-min
320#
321# If you want even less configs:
322#
323#   log in directly to target (do not ssh)
324#
325#   $ su
326#   # lsmod | cut -d' ' -f1 | xargs rmmod
327#
328#   repeat the above several times
329#
330#   # lsmod > mymods
331#   # reboot
332#
333# May need to reboot to get your network back to copy the mymods
334# to the host, and then remove the previous .config and run the
335# localyesconfig again. The CONFIG_MIN generated like this will
336# not guarantee network activity to the box so the TEST_TYPE of
337# test may fail.
338#
339# You might also want to set:
340#   CONFIG_CMDLINE="<your options here>"
341#  randconfig may set the above and override your real command
342#  line options.
343# (default undefined)
344#MIN_CONFIG = /home/test/config-min
345
346# Sometimes there's options that just break the boot and
347# you do not care about. Here are a few:
348#   # CONFIG_STAGING is not set
349#  Staging drivers are horrible, and can break the build.
350#   # CONFIG_SCSI_DEBUG is not set
351#  SCSI_DEBUG may change your root partition
352#   # CONFIG_KGDB_SERIAL_CONSOLE is not set
353#  KGDB may cause oops waiting for a connection that's not there.
354# This option points to the file containing config options that will be prepended
355# to the MIN_CONFIG (or be the MIN_CONFIG if it is not set)
356#
357# Note, config options in MIN_CONFIG will override these options.
358#
359# (default undefined)
360#ADD_CONFIG = /home/test/config-broken
361
362# The location on the host where to write temp files
363# (default /tmp/ktest)
364#TMP_DIR = /tmp/ktest
365
366# Optional log file to write the status (recommended)
367#  Note, this is a DEFAULT section only option.
368# (default undefined)
369#LOG_FILE = /home/test/logfiles/target.log
370
371# Remove old logfile if it exists before starting all tests.
372#  Note, this is a DEFAULT section only option.
373# (default 0)
374#CLEAR_LOG = 0
375
376# Line to define a successful boot up in console output.
377# This is what the line contains, not the entire line. If you need
378# the entire line to match, then use regural expression syntax like:
379#  (do not add any quotes around it)
380#
381#  SUCCESS_LINE = ^MyBox Login:$
382#
383# (default "login:")
384#SUCCESS_LINE = login:
385
386# In case the console constantly fills the screen, having
387# a specified time to stop the test after success is recommended.
388# (in seconds)
389# (default 10)
390#STOP_AFTER_SUCCESS = 10
391
392# In case the console constantly fills the screen, having
393# a specified time to stop the test after failure is recommended.
394# (in seconds)
395# (default 60)
396#STOP_AFTER_FAILURE = 60
397
398# In case the console constantly fills the screen, having
399# a specified time to stop the test if it never succeeds nor fails
400# is recommended.
401# Note: this is ignored if a success or failure is detected.
402# (in seconds)
403# (default 600, -1 is to never stop)
404#STOP_TEST_AFTER = 600
405
406# Stop testing if a build fails. If set, the script will end if
407# a failure is detected, otherwise it will save off the .config,
408# dmesg and bootlog in a directory called
409# MACHINE-TEST_TYPE_BUILD_TYPE-fail-yyyymmddhhmmss
410# if the STORE_FAILURES directory is set.
411# (default 1)
412# Note, even if this is set to zero, there are some errors that still
413# stop the tests.
414#DIE_ON_FAILURE = 1
415
416# Directory to store failure directories on failure. If this is not
417# set, DIE_ON_FAILURE=0 will not save off the .config, dmesg and
418# bootlog. This option is ignored if DIE_ON_FAILURE is not set.
419# (default undefined)
420#STORE_FAILURES = /home/test/failures
421
422# Build without doing a make mrproper, or removing .config
423# (default 0)
424#BUILD_NOCLEAN = 0
425
426# As the test reads the console, after it hits the SUCCESS_LINE
427# the time it waits for the monitor to settle down between reads
428# can usually be lowered.
429# (in seconds) (default 1)
430#BOOTED_TIMEOUT = 1
431
432# The timeout in seconds when we consider the box hung after
433# the console stop producing output. Be sure to leave enough
434# time here to get pass a reboot. Some machines may not produce
435# any console output for a long time during a reboot. You do
436# not want the test to fail just because the system was in
437# the process of rebooting to the test kernel.
438# (default 120)
439#TIMEOUT = 120
440
441# In between tests, a reboot of the box may occur, and this
442# is the time to wait for the console after it stops producing
443# output. Some machines may not produce a large lag on reboot
444# so this should accommodate it.
445# The difference between this and TIMEOUT, is that TIMEOUT happens
446# when rebooting to the test kernel. This sleep time happens
447# after a test has completed and we are about to start running
448# another test. If a reboot to the reliable kernel happens,
449# we wait SLEEP_TIME for the console to stop producing output
450# before starting the next test.
451# (default 60)
452#SLEEP_TIME = 60
453
454# The time in between bisects to sleep (in seconds)
455# (default 60)
456#BISECT_SLEEP_TIME = 60
457
458# The time in between patch checks to sleep (in seconds)
459# (default 60)
460#PATCHCHECK_SLEEP_TIME = 60
461
462# Reboot the target box on error (default 0)
463#REBOOT_ON_ERROR = 0
464
465# Power off the target on error (ignored if REBOOT_ON_ERROR is set)
466#  Note, this is a DEFAULT section only option.
467# (default 0)
468#POWEROFF_ON_ERROR = 0
469
470# Power off the target after all tests have completed successfully
471#  Note, this is a DEFAULT section only option.
472# (default 0)
473#POWEROFF_ON_SUCCESS = 0
474
475# Reboot the target after all test completed successfully (default 1)
476# (ignored if POWEROFF_ON_SUCCESS is set)
477#REBOOT_ON_SUCCESS = 1
478
479# In case there are isses with rebooting, you can specify this
480# to always powercycle after this amount of time after calling
481# reboot.
482# Note, POWERCYCLE_AFTER_REBOOT = 0 does NOT disable it. It just
483# makes it powercycle immediately after rebooting. Do not define
484# it if you do not want it.
485# (default undefined)
486#POWERCYCLE_AFTER_REBOOT = 5
487
488# In case there's isses with halting, you can specify this
489# to always poweroff after this amount of time after calling
490# halt.
491# Note, POWEROFF_AFTER_HALT = 0 does NOT disable it. It just
492# makes it poweroff immediately after halting. Do not define
493# it if you do not want it.
494# (default undefined)
495#POWEROFF_AFTER_HALT = 20
496
497# A script or command to power off the box (default undefined)
498# Needed for POWEROFF_ON_ERROR and SUCCESS
499#
500# Example for digital loggers power switch:
501#POWER_OFF = wget --no-proxy -O /dev/null -q  --auth-no-challenge 'http://admin:admin@power/outlet?5=OFF'
502#
503# Example for a virtual guest call "Guest".
504#POWER_OFF = virsh destroy Guest
505
506# The way to execute a command on the target
507# (default ssh $SSH_USER@$MACHINE $SSH_COMMAND";)
508# The variables SSH_USER, MACHINE and SSH_COMMAND are defined
509#SSH_EXEC = ssh $SSH_USER@$MACHINE $SSH_COMMAND";
510
511# The way to copy a file to the target
512# (default scp $SRC_FILE $SSH_USER@$MACHINE:$DST_FILE)
513# The variables SSH_USER, MACHINE, SRC_FILE and DST_FILE are defined.
514#SCP_TO_TARGET = scp $SRC_FILE $SSH_USER@$MACHINE:$DST_FILE
515
516# The nice way to reboot the target
517# (default ssh $SSH_USER@$MACHINE reboot)
518# The variables SSH_USER and MACHINE are defined.
519#REBOOT = ssh $SSH_USER@$MACHINE reboot
520
521#### Per test run options ####
522# The following options are only allowed in TEST_START sections.
523# They are ignored in the DEFAULTS sections.
524#
525# All of these are optional and undefined by default, although
526#  some of these options are required for TEST_TYPE of patchcheck
527#  and bisect.
528#
529#
530# CHECKOUT = branch
531#
532#  If the BUILD_DIR is a git repository, then you can set this option
533#  to checkout the given branch before running the TEST. If you
534#  specify this for the first run, that branch will be used for
535#  all preceding tests until a new CHECKOUT is set.
536#
537#
538#
539# For TEST_TYPE = patchcheck
540#
541#  This expects the BUILD_DIR to be a git repository, and
542#  will checkout the PATCHCHECK_START commit.
543#
544#  The option BUILD_TYPE will be ignored.
545#
546#  The MIN_CONFIG will be used for all builds of the patchcheck. The build type
547#  used for patchcheck is oldconfig.
548#
549#  PATCHCHECK_START is required and is the first patch to
550#   test (the SHA1 of the commit). You may also specify anything
551#   that git checkout allows (branch name, tage, HEAD~3).
552#
553#  PATCHCHECK_END is the last patch to check (default HEAD)
554#
555#  PATCHCHECK_TYPE is required and is the type of test to run:
556#      build, boot, test.
557#
558#   Note, the build test will look for warnings, if a warning occurred
559#     in a file that a commit touches, the build will fail.
560#
561#   If BUILD_NOCLEAN is set, then make mrproper will not be run on
562#   any of the builds, just like all other TEST_TYPE tests. But
563#   what makes patchcheck different from the other tests, is if
564#   BUILD_NOCLEAN is not set, only the first and last patch run
565#   make mrproper. This helps speed up the test.
566#
567# Example:
568#   TEST_START
569#   TEST_TYPE = patchcheck
570#   CHECKOUT = mybranch
571#   PATCHCHECK_TYPE = boot
572#   PATCHCHECK_START = 747e94ae3d1b4c9bf5380e569f614eb9040b79e7
573#   PATCHCHECK_END = HEAD~2
574#
575#
576#
577# For TEST_TYPE = bisect
578#
579#  You can specify a git bisect if the BUILD_DIR is a git repository.
580#  The MIN_CONFIG will be used for all builds of the bisect. The build type
581#  used for bisecting is oldconfig.
582#
583#  The option BUILD_TYPE will be ignored.
584#
585#  BISECT_TYPE is the type of test to perform:
586#	build	- bad fails to build
587#	boot	- bad builds but fails to boot
588#	test	- bad boots but fails a test
589#
590# BISECT_GOOD is the commit (SHA1) to label as good (accepts all git good commit types)
591# BISECT_BAD is the commit to label as bad (accepts all git bad commit types)
592#
593# The above three options are required for a bisect operation.
594#
595# BISECT_REPLAY = /path/to/replay/file (optional, default undefined)
596#
597#   If an operation failed in the bisect that was not expected to
598#   fail. Then the test ends. The state of the BUILD_DIR will be
599#   left off at where the failure occurred. You can examine the
600#   reason for the failure, and perhaps even find a git commit
601#   that would work to continue with. You can run:
602#
603#   git bisect log > /path/to/replay/file
604#
605#   The adding:
606#
607#    BISECT_REPLAY= /path/to/replay/file
608#
609#   And running the test again. The test will perform the initial
610#    git bisect start, git bisect good, and git bisect bad, and
611#    then it will run git bisect replay on this file, before
612#    continuing with the bisect.
613#
614# BISECT_START = commit (optional, default undefined)
615#
616#   As with BISECT_REPLAY, if the test failed on a commit that
617#   just happen to have a bad commit in the middle of the bisect,
618#   and you need to skip it. If BISECT_START is defined, it
619#   will checkout that commit after doing the initial git bisect start,
620#   git bisect good, git bisect bad, and running the git bisect replay
621#   if the BISECT_REPLAY is set.
622#
623# BISECT_SKIP = 1 (optional, default 0)
624#
625#   If BISECT_TYPE is set to test but the build fails, ktest will
626#   simply fail the test and end their. You could use BISECT_REPLAY
627#   and BISECT_START to resume after you found a new starting point,
628#   or you could set BISECT_SKIP to 1. If BISECT_SKIP is set to 1,
629#   when something other than the BISECT_TYPE fails, ktest.pl will
630#   run "git bisect skip" and try again.
631#
632# BISECT_FILES = <path> (optional, default undefined)
633#
634#   To just run the git bisect on a specific path, set BISECT_FILES.
635#   For example:
636#
637#     BISECT_FILES = arch/x86 kernel/time
638#
639#   Will run the bisect with "git bisect start -- arch/x86 kernel/time"
640#
641# BISECT_REVERSE = 1 (optional, default 0)
642#
643#   In those strange instances where it was broken forever
644#   and you are trying to find where it started to work!
645#   Set BISECT_GOOD to the commit that was last known to fail
646#   Set BISECT_BAD to the commit that is known to start working.
647#   With BISECT_REVERSE = 1, The test will consider failures as
648#   good, and success as bad.
649#
650# BISECT_MANUAL = 1 (optional, default 0)
651#
652#   In case there's a problem with automating the bisect for
653#   whatever reason. (Can't reboot, want to inspect each iteration)
654#   Doing a BISECT_MANUAL will have the test wait for you to
655#   tell it if the test passed or failed after each iteration.
656#   This is basicall the same as running git bisect yourself
657#   but ktest will rebuild and install the kernel for you.
658#
659# BISECT_CHECK = 1 (optional, default 0)
660#
661#   Just to be sure the good is good and bad is bad, setting
662#   BISECT_CHECK to 1 will start the bisect by first checking
663#   out BISECT_BAD and makes sure it fails, then it will check
664#   out BISECT_GOOD and makes sure it succeeds before starting
665#   the bisect (it works for BISECT_REVERSE too).
666#
667#   You can limit the test to just check BISECT_GOOD or
668#   BISECT_BAD with BISECT_CHECK = good or
669#   BISECT_CHECK = bad, respectively.
670#
671# Example:
672#   TEST_START
673#   TEST_TYPE = bisect
674#   BISECT_GOOD = v2.6.36
675#   BISECT_BAD = b5153163ed580e00c67bdfecb02b2e3843817b3e
676#   BISECT_TYPE = build
677#   MIN_CONFIG = /home/test/config-bisect
678#
679#
680#
681# For TEST_TYPE = config_bisect
682#
683#  In those cases that you have two different configs. One of them
684#  work, the other does not, and you do not know what config causes
685#  the problem.
686#  The TEST_TYPE config_bisect will bisect the bad config looking for
687#  what config causes the failure.
688#
689#  The way it works is this:
690#
691#   First it finds a config to work with. Since a different version, or
692#   MIN_CONFIG may cause different dependecies, it must run through this
693#   preparation.
694#
695#   Overwrites any config set in the bad config with a config set in
696#   either the MIN_CONFIG or ADD_CONFIG. Thus, make sure these configs
697#   are minimal and do not disable configs you want to test:
698#   (ie.  # CONFIG_FOO is not set).
699#
700#   An oldconfig is run on the bad config and any new config that
701#   appears will be added to the configs to test.
702#
703#   Finally, it generates a config with the above result and runs it
704#   again through make oldconfig to produce a config that should be
705#   satisfied by kconfig.
706#
707#   Then it starts the bisect.
708#
709#   The configs to test are cut in half. If all the configs in this
710#   half depend on a config in the other half, then the other half
711#   is tested instead. If no configs are enabled by either half, then
712#   this means a circular dependency exists and the test fails.
713#
714#   A config is created with the test half, and the bisect test is run.
715#
716#   If the bisect succeeds, then all configs in the generated config
717#   are removed from the configs to test and added to the configs that
718#   will be enabled for all builds (they will be enabled, but not be part
719#   of the configs to examine).
720#
721#   If the bisect fails, then all test configs that were not enabled by
722#   the config file are removed from the test. These configs will not
723#   be enabled in future tests. Since current config failed, we consider
724#   this to be a subset of the config that we started with.
725#
726#   When we are down to one config, it is considered the bad config.
727#
728#   Note, the config chosen may not be the true bad config. Due to
729#   dependencies and selections of the kbuild system, mulitple
730#   configs may be needed to cause a failure. If you disable the
731#   config that was found and restart the test, if the test fails
732#   again, it is recommended to rerun the config_bisect with a new
733#   bad config without the found config enabled.
734#
735#  The option BUILD_TYPE will be ignored.
736#
737#  CONFIG_BISECT_TYPE is the type of test to perform:
738#	build	- bad fails to build
739#	boot	- bad builds but fails to boot
740#	test	- bad boots but fails a test
741#
742#   CONFIG_BISECT is the config that failed to boot
743#
744#   If BISECT_MANUAL is set, it will pause between iterations.
745#   This is useful to use just ktest.pl just for the config bisect.
746#   If you set it to build, it will run the bisect and you can
747#   control what happens in between iterations. It will ask you if
748#   the test succeeded or not and continue the config bisect.
749#
750# Example:
751#   TEST_START
752#   TEST_TYPE = config_bisect
753#   CONFIG_BISECT_TYPE = build
754#   CONFIG_BISECT = /home/test/�onfig-bad
755#   MIN_CONFIG = /home/test/config-min
756#   BISECT_MANUAL = 1
757#
758