Re: [PATCH v3 1/3] kunit: fix bug in debugfs logs of parameterized tests

On Wed, 8 Mar 2023 at 06:39, Rae Moar rmoar@google.com wrote:

Fix bug in debugfs logs that causes individual parameterized results to not appear because the log is reinitialized (cleared) when each parameter is run.

Ensure these results appear in the debugfs logs, increase log size to allow for the size of parameterized results. As a result, append lines to the log directly rather than using an intermediate variable that can cause stack size warnings due to the increased log size.

Here is the debugfs log of ext4_inode_test which uses parameterized tests before the fix:

 KTAP version 1

 # Subtest: ext4_inode_test
 1..1

# Totals: pass:16 fail:0 skip:0 total:16 ok 1 ext4_inode_test

As you can see, this log does not include any of the individual parametrized results.

After (in combination with the next two fixes to remove extra empty line and ensure KTAP valid format):

KTAP version 1 1..1 KTAP version 1 # Subtest: ext4_inode_test 1..1 KTAP version 1 # Subtest: inode_test_xtimestamp_decoding ok 1 1901-12-13 Lower bound of 32bit < 0 timestamp, no extra bits ... (the rest of the individual parameterized tests) ok 16 2446-05-10 Upper bound of 32bit >=0 timestamp. All extra # inode_test_xtimestamp_decoding: pass:16 fail:0 skip:0 total:16 ok 1 inode_test_xtimestamp_decoding # Totals: pass:16 fail:0 skip:0 total:16 ok 1 ext4_inode_test

Signed-off-by: Rae Moar rmoar@google.com Reviewed-by: David Gow davidgow@google.com

---

Thanks, this is working fine here!

Reviewed-by: David Gow davidgow@google.com

Cheers, -- David

Changes from v2 -> v3:

• Fix a off-by-one bug in the kunit_log_append method.

Changes from v1 -> v2:

• Remove the use of the line variable in kunit_log_append that was causing stack size warnings.
• Add before and after to the commit message.

include/kunit/test.h | 2 +- lib/kunit/test.c | 18 ++++++++++++------ 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/include/kunit/test.h b/include/kunit/test.h index 08d3559dd703..0668d29f3453 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -34,7 +34,7 @@ DECLARE_STATIC_KEY_FALSE(kunit_running); struct kunit;

/* Size of log associated with test. */ -#define KUNIT_LOG_SIZE 512 +#define KUNIT_LOG_SIZE 1500

/* Maximum size of parameter description string. */ #define KUNIT_PARAM_DESC_SIZE 128 diff --git a/lib/kunit/test.c b/lib/kunit/test.c index c9e15bb60058..c4d6304edd61 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -114,22 +114,27 @@ static void kunit_print_test_stats(struct kunit *test, */ void kunit_log_append(char *log, const char *fmt, ...) {

•   char line[KUNIT_LOG_SIZE];
    va_list args;
  

•   int len_left;
  

•   int len, log_len, len_left;
  
    if (!log)
            return;
  
  

•   len_left = KUNIT_LOG_SIZE - strlen(log) - 1;
  

•   log_len = strlen(log);
  

•   len_left = KUNIT_LOG_SIZE - log_len - 1;
    if (len_left <= 0)
            return;
  
  

•   /* Evaluate length of line to add to log */
    va_start(args, fmt);
  

•   vsnprintf(line, sizeof(line), fmt, args);
  

•   len = vsnprintf(NULL, 0, fmt, args) + 1;
  

•   va_end(args);
  

•   /* Print formatted line to the log */
  

•   va_start(args, fmt);
  

•   vsnprintf(log + log_len, min(len, len_left), fmt, args);
    va_end(args);
  
  

•   strncat(log, line, len_left);
  

} EXPORT_SYMBOL_GPL(kunit_log_append);

@@ -437,7 +442,6 @@ static void kunit_run_case_catch_errors(struct kunit_suite *suite, struct kunit_try_catch_context context; struct kunit_try_catch *try_catch;

•   kunit_init_test(test, test_case->name, test_case->log);
    try_catch = &test->try_catch;
  
    kunit_try_catch_init(try_catch,
  

@@ -533,6 +537,8 @@ int kunit_run_tests(struct kunit_suite *suite) struct kunit_result_stats param_stats = { 0 }; test_case->status = KUNIT_SKIPPED;

•           kunit_init_test(&test, test_case->name, test_case->log);
  

•           if (!test_case->generate_params) {
                    /* Non-parameterised test. */
                    kunit_run_case_catch_errors(suite, test_case, &test);
  
  

base-commit: 60684c2bd35064043360e6f716d1b7c20e967b7d

2.40.0.rc0.216.gc4246ad0f0-goog