linux-kernel - [PATCH v3 1/2] kunit: tool: Fix bug in parsing test plan

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Message-ID: <20250313192714.1380005-1-rmoar@google.com>
Date: Thu, 13 Mar 2025 19:27:13 +0000
From: Rae Moar <rmoar@...gle.com>
To: shuah@...nel.org, davidgow@...gle.com
Cc: jackmanb@...gle.com, linux-kselftest@...r.kernel.org, 
	kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org, 
	Rae Moar <rmoar@...gle.com>
Subject: [PATCH v3 1/2] kunit: tool: Fix bug in parsing test plan

A bug was identified where the KTAP below caused an infinite loop:

 TAP version 13
 ok 4 test_case
 1..4

The infinite loop was caused by the parser not parsing a test plan
if following a test result line.

Fix this bug by parsing test plan line to avoid the infinite loop.

Signed-off-by: Rae Moar <rmoar@...gle.com>
---
Changes since v2:
- None, adds test in second patch

 tools/testing/kunit/kunit_parser.py | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/testing/kunit/kunit_parser.py b/tools/testing/kunit/kunit_parser.py
index 29fc27e8949b..da53a709773a 100644
--- a/tools/testing/kunit/kunit_parser.py
+++ b/tools/testing/kunit/kunit_parser.py
@@ -759,7 +759,7 @@ def parse_test(lines: LineStream, expected_num: int, log: List[str], is_subtest:
 		# If parsing the main/top-level test, parse KTAP version line and
 		# test plan
 		test.name = "main"
-		ktap_line = parse_ktap_header(lines, test, printer)
+		parse_ktap_header(lines, test, printer)
 		test.log.extend(parse_diagnostic(lines))
 		parse_test_plan(lines, test)
 		parent_test = True
@@ -768,13 +768,12 @@ def parse_test(lines: LineStream, expected_num: int, log: List[str], is_subtest:
 		# the KTAP version line and/or subtest header line
 		ktap_line = parse_ktap_header(lines, test, printer)
 		subtest_line = parse_test_header(lines, test)
+		test.log.extend(parse_diagnostic(lines))
+		parse_test_plan(lines, test)
 		parent_test = (ktap_line or subtest_line)
 		if parent_test:
-			# If KTAP version line and/or subtest header is found, attempt
-			# to parse test plan and print test header
-			test.log.extend(parse_diagnostic(lines))
-			parse_test_plan(lines, test)
 			print_test_header(test, printer)
+
 	expected_count = test.expected_count
 	subtests = []
 	test_num = 1

base-commit: 0619a4868fc1b32b07fb9ed6c69adc5e5cf4e4b2
-- 
2.49.0.rc1.451.g8f38331e32-goog