It might not be obvious to the compiler that the expression must be executed between writing and reading to fail_data. In this case, the compiler might reorder or optimize away some of the accesses, and the tests will fail.
Add compiler barriers around the expression in KUNIT_EXPECT_KASAN_FAIL. Signed-off-by: Andrey Konovalov <[email protected]> Link: https://linux-review.googlesource.com/id/I046079f48641a1d36fe627fc8827a9249102fd50 --- lib/test_kasan.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/test_kasan.c b/lib/test_kasan.c index dd3d2f95c24e..b5077a47b95a 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -79,7 +79,9 @@ static void kasan_test_exit(struct kunit *test) NULL, \ &resource, \ "kasan_data", &fail_data); \ + barrier(); \ expression; \ + barrier(); \ KUNIT_EXPECT_EQ(test, \ fail_data.report_expected, \ fail_data.report_found); \ -- 2.29.2.729.g45daf8777d-goog
