3 # Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
5 # This program is free software; you can redistribute it and/or modify it
6 # under the terms of the GNU General Public License as published by the Free
7 # Software Foundation; either version 2 of the License, or at your option any
8 # later version; or, when distributed separately from the Linux kernel or
9 # when incorporated into other software packages, subject to the following
12 # This program is free software; you can redistribute it and/or modify it
13 # under the terms of copyleft-next (version 0.3.1 or later) as published
14 # at http://copyleft-next.org/.
16 # This is a stress test script for kmod, the kernel module loader. It uses
17 # test_kmod which exposes a series of knobs for the API for us so we can
18 # tweak each test in userspace rather than in kernelspace.
20 # The way kmod works is it uses the kernel's usermode helper API to eventually
21 # call /sbin/modprobe. It has a limit of the number of concurrent calls
22 # possible. The kernel interface to load modules is request_module(), however
23 # mount uses get_fs_type(). Both behave slightly differently, but the
24 # differences are important enough to test each call separately. For this
25 # reason test_kmod starts by providing tests for both calls.
27 # The test driver test_kmod assumes a series of defaults which you can
28 # override by exporting to your environment prior running this script.
29 # For instance this script assumes you do not have xfs loaded upon boot.
30 # If this is false, export DEFAULT_KMOD_FS="ext4" prior to running this
31 # script if the filesyste module you don't have loaded upon bootup
32 # is ext4 instead. Refer to allow_user_defaults() for a list of user
33 # override variables possible.
35 # You'll want at least 4 GiB of RAM to expect to run these tests
36 # without running out of memory on them. For other requirements refer
42 TEST_DRIVER="test_${TEST_NAME}"
43 TEST_DIR=$(dirname $0)
47 # TEST_ID:TEST_COUNT:ENABLED
49 # TEST_ID: is the test id number
50 # TEST_COUNT: number of times we should run the test
51 # ENABLED: 1 if enabled, 0 otherwise
53 # Once these are enabled please leave them as-is. Write your own test,
54 # we have tons of space.
56 ALL_TESTS="$ALL_TESTS 0002:3:1"
57 ALL_TESTS="$ALL_TESTS 0003:1:1"
58 ALL_TESTS="$ALL_TESTS 0004:1:1"
59 ALL_TESTS="$ALL_TESTS 0005:10:1"
60 ALL_TESTS="$ALL_TESTS 0006:10:1"
61 ALL_TESTS="$ALL_TESTS 0007:5:1"
65 # 0008 x 150 - multithreaded - push kmod_concurrent over max_modprobes for request_module()"
66 # Current best-effort failure interpretation:
67 # Enough module requests get loaded in place fast enough to reach over the
68 # max_modprobes limit and trigger a failure -- before we're even able to
69 # start processing pending requests.
70 ALL_TESTS="$ALL_TESTS 0008:150:0"
72 # 0009 x 150 - multithreaded - push kmod_concurrent over max_modprobes for get_fs_type()"
73 # Current best-effort failure interpretation:
75 # get_fs_type() requests modules using aliases as such the optimization in
76 # place today to look for already loaded modules will not take effect and
77 # we end up requesting a new module to load, this bumps the kmod_concurrent,
78 # and in certain circumstances can lead to pushing the kmod_concurrent over
79 # the max_modprobe limit.
81 # This test fails much easier than test 0008 since the alias optimizations
83 ALL_TESTS="$ALL_TESTS 0009:150:0"
87 if [ ! -d $DIR ]; then
88 echo "$0: $DIR not present" >&2
89 echo "You must have the following enabled in your kernel:" >&2
90 cat $TEST_DIR/config >&2
95 function allow_user_defaults()
97 if [ -z $DEFAULT_KMOD_DRIVER ]; then
98 DEFAULT_KMOD_DRIVER="test_module"
101 if [ -z $DEFAULT_KMOD_FS ]; then
102 DEFAULT_KMOD_FS="xfs"
105 if [ -z $PROC_DIR ]; then
106 PROC_DIR="/proc/sys/kernel/"
109 if [ -z $MODPROBE_LIMIT ]; then
114 DIR="/sys/devices/virtual/misc/${TEST_DRIVER}0/"
117 if [ -z $DEFAULT_NUM_TESTS ]; then
118 DEFAULT_NUM_TESTS=150
121 MODPROBE_LIMIT_FILE="${PROC_DIR}/kmod-limit"
126 if ! which modprobe 2> /dev/null > /dev/null; then
127 echo "$0: You need modprobe installed" >&2
131 if ! which kmod 2> /dev/null > /dev/null; then
132 echo "$0: You need kmod installed" >&2
136 # kmod 19 has a bad bug where it returns 0 when modprobe
137 # gets called *even* if the module was not loaded due to
138 # some bad heuristics. For details see:
140 # A work around is possible in-kernel but its rather
142 KMOD_VERSION=$(kmod --version | awk '{print $3}')
143 if [[ $KMOD_VERSION -le 19 ]]; then
144 echo "$0: You need at least kmod 20" >&2
145 echo "kmod <= 19 is buggy, for details see:" >&2
146 echo "http://git.kernel.org/cgit/utils/kernel/kmod/kmod.git/commit/libkmod/libkmod-module.c?id=fd44a98ae2eb5eb32161088954ab21e58e19dfc4" >&2
151 if [ $uid -ne 0 ]; then
152 echo $msg must be run as root >&2
157 function load_req_mod()
159 trap "test_modprobe" EXIT
161 if [ ! -d $DIR ]; then
162 # Alanis: "Oh isn't it ironic?"
163 modprobe $TEST_DRIVER
169 echo "Test completed"
175 # kmod calls modprobe and upon of a module not found
176 # modprobe returns just 1... However in the kernel we
177 # *sometimes* see 256...
198 echo MODULE_NOT_FOUND;;
213 config_set_test_case_driver()
215 if ! echo -n 1 >$DIR/config_test_case; then
216 echo "$0: Unable to set to test case to driver" >&2
221 config_set_test_case_fs()
223 if ! echo -n 2 >$DIR/config_test_case; then
224 echo "$0: Unable to set to test case to fs" >&2
231 if ! echo -n $1 >$DIR/config_num_threads; then
232 echo "$0: Unable to set to number of threads" >&2
237 config_get_modprobe_limit()
239 if [[ -f ${MODPROBE_LIMIT_FILE} ]] ; then
240 MODPROBE_LIMIT=$(cat $MODPROBE_LIMIT_FILE)
245 config_num_thread_limit_extra()
247 MODPROBE_LIMIT=$(config_get_modprobe_limit)
248 let EXTRA_LIMIT=$MODPROBE_LIMIT+$1
249 config_num_threads $EXTRA_LIMIT
252 # For special characters use printf directly,
253 # refer to kmod_test_0001
256 if ! echo -n $1 >$DIR/config_test_driver; then
257 echo "$0: Unable to set driver" >&2
264 if ! echo -n $1 >$DIR/config_test_fs; then
265 echo "$0: Unable to set driver" >&2
272 cat $DIR/config_test_driver
275 config_get_test_result()
282 if ! echo -n "1" >"$DIR"/reset; then
283 echo "$0: reset shuld have worked" >&2
290 echo "----------------------------------------------------"
292 echo "----------------------------------------------------"
297 if ! echo -n "1" >"$DIR"/trigger_config 2>/dev/null; then
298 echo "$1: FAIL - loading should have worked"
302 echo "$1: OK! - loading kmod test"
305 config_trigger_want_fail()
307 if echo "1" > $DIR/trigger_config 2>/dev/null; then
308 echo "$1: FAIL - test case was expected to fail"
312 echo "$1: OK! - kmod test case failed as expected"
315 config_expect_result()
317 RC=$(config_get_test_result)
318 RC_NAME=$(errno_val_to_name $RC)
321 ERRNO=$(errno_name_to_val $ERRNO_NAME)
323 if [[ $ERRNO_NAME = "-ERR_ANY" ]]; then
324 if [[ $RC -ge 0 ]]; then
325 echo "$1: FAIL, test expects $ERRNO_NAME - got $RC_NAME ($RC)" >&2
329 elif [[ $RC != $ERRNO ]]; then
330 echo "$1: FAIL, test expects $ERRNO_NAME ($ERRNO) - got $RC_NAME ($RC)" >&2
334 echo "$1: OK! - Return value: $RC ($RC_NAME), expected $ERRNO_NAME"
337 kmod_defaults_driver()
340 modprobe -r $DEFAULT_KMOD_DRIVER
341 config_set_driver $DEFAULT_KMOD_DRIVER
347 modprobe -r $DEFAULT_KMOD_FS
348 config_set_fs $DEFAULT_KMOD_FS
349 config_set_test_case_fs
352 kmod_test_0001_driver()
358 printf '\000' >"$DIR"/config_test_driver
359 config_trigger ${FUNCNAME[0]}
360 config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
369 printf '\000' >"$DIR"/config_test_fs
370 config_trigger ${FUNCNAME[0]}
371 config_expect_result ${FUNCNAME[0]} -EINVAL
376 kmod_test_0001_driver
380 kmod_test_0002_driver()
382 NAME="nope-$DEFAULT_KMOD_DRIVER"
385 config_set_driver $NAME
387 config_trigger ${FUNCNAME[0]}
388 config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
393 NAME="nope-$DEFAULT_KMOD_FS"
397 config_trigger ${FUNCNAME[0]}
398 config_expect_result ${FUNCNAME[0]} -EINVAL
403 kmod_test_0002_driver
411 config_trigger ${FUNCNAME[0]}
412 config_expect_result ${FUNCNAME[0]} SUCCESS
419 config_trigger ${FUNCNAME[0]}
420 config_expect_result ${FUNCNAME[0]} SUCCESS
426 config_trigger ${FUNCNAME[0]}
427 config_expect_result ${FUNCNAME[0]} SUCCESS
433 config_trigger ${FUNCNAME[0]}
434 config_expect_result ${FUNCNAME[0]} SUCCESS
446 MODPROBE_LIMIT=$(config_get_modprobe_limit)
447 let EXTRA=$MODPROBE_LIMIT/6
448 config_num_thread_limit_extra $EXTRA
449 config_trigger ${FUNCNAME[0]}
450 config_expect_result ${FUNCNAME[0]} SUCCESS
456 MODPROBE_LIMIT=$(config_get_modprobe_limit)
457 let EXTRA=$MODPROBE_LIMIT/4
458 config_num_thread_limit_extra $EXTRA
459 config_trigger ${FUNCNAME[0]}
460 config_expect_result ${FUNCNAME[0]} SUCCESS
467 echo "TEST_ID x NUM_TEST"
468 echo "TEST_ID: Test ID"
469 echo "NUM_TESTS: Number of recommended times to run the test"
471 echo "0001 x $(get_test_count 0001) - Simple test - 1 thread for empty string"
472 echo "0002 x $(get_test_count 0002) - Simple test - 1 thread for modules/filesystems that do not exist"
473 echo "0003 x $(get_test_count 0003) - Simple test - 1 thread for get_fs_type() only"
474 echo "0004 x $(get_test_count 0004) - Simple test - 2 threads for get_fs_type() only"
475 echo "0005 x $(get_test_count 0005) - multithreaded tests with default setup - request_module() only"
476 echo "0006 x $(get_test_count 0006) - multithreaded tests with default setup - get_fs_type() only"
477 echo "0007 x $(get_test_count 0007) - multithreaded tests with default setup test request_module() and get_fs_type()"
478 echo "0008 x $(get_test_count 0008) - multithreaded - push kmod_concurrent over max_modprobes for request_module()"
479 echo "0009 x $(get_test_count 0009) - multithreaded - push kmod_concurrent over max_modprobes for get_fs_type()"
484 NUM_TESTS=$(grep -o ' ' <<<"$ALL_TESTS" | grep -c .)
485 let NUM_TESTS=$NUM_TESTS+1
486 MAX_TEST=$(printf "%04d\n" $NUM_TESTS)
487 echo "Usage: $0 [ -t <4-number-digit> ] | [ -w <4-number-digit> ] |"
488 echo " [ -s <4-number-digit> ] | [ -c <4-number-digit> <test- count>"
489 echo " [ all ] [ -h | --help ] [ -l ]"
491 echo "Valid tests: 0001-$MAX_TEST"
493 echo " all Runs all tests (default)"
494 echo " -t Run test ID the number amount of times is recommended"
495 echo " -w Watch test ID run until it runs into an error"
496 echo " -c Run test ID once"
497 echo " -s Run test ID x test-count number of times"
498 echo " -l List all test ID list"
499 echo " -h|--help Help"
501 echo "If an error every occurs execution will immediately terminate."
502 echo "If you are adding a new test try using -w <test-ID> first to"
503 echo "make sure the test passes a series of tests."
507 echo "${TEST_NAME}.sh -- executes all tests"
508 echo "${TEST_NAME}.sh -t 0008 -- Executes test ID 0008 number of times is recomended"
509 echo "${TEST_NAME}.sh -w 0008 -- Watch test ID 0008 run until an error occurs"
510 echo "${TEST_NAME}.sh -s 0008 -- Run test ID 0008 once"
511 echo "${TEST_NAME}.sh -c 0008 3 -- Run test ID 0008 three times"
520 if ! [[ $1 =~ $re ]]; then
525 function get_test_count()
528 TEST_DATA=$(echo $ALL_TESTS | awk '{print $'$1'}')
529 LAST_TWO=${TEST_DATA#*:*}
533 function get_test_enabled()
536 TEST_DATA=$(echo $ALL_TESTS | awk '{print $'$1'}')
537 echo ${TEST_DATA#*:*:}
540 function run_all_tests()
542 for i in $ALL_TESTS ; do
544 ENABLED=$(get_test_enabled $TEST_ID)
545 TEST_COUNT=$(get_test_count $TEST_ID)
546 if [[ $ENABLED -eq "1" ]]; then
547 test_case $TEST_ID $TEST_COUNT
554 if [ $# -ne 3 ]; then
558 echo "Running test: $2 - run #$1"
561 function watch_case()
566 if [ $# -eq 1 ]; then
568 watch_log $i ${TEST_NAME}_test_$1
580 NUM_TESTS=$DEFAULT_NUM_TESTS
581 if [ $# -eq 2 ]; then
586 while [ $i -lt $NUM_TESTS ]; do
588 watch_log $i ${TEST_NAME}_test_$1 noclear
589 RUN_TEST=${TEST_NAME}_test_$1
595 function parse_args()
597 if [ $# -eq 0 ]; then
600 if [[ "$1" = "all" ]]; then
602 elif [[ "$1" = "-w" ]]; then
605 elif [[ "$1" = "-t" ]]; then
608 test_case $1 $(get_test_count $1)
609 elif [[ "$1" = "-c" ]]; then
614 elif [[ "$1" = "-s" ]]; then
617 elif [[ "$1" = "-l" ]]; then
619 elif [[ "$1" = "-h" || "$1" = "--help" ]]; then
631 trap "test_finish" EXIT