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[v2] kasan: test: prevent cache merging in kmem_cache_double_destroy

Message ID b597bd434c49591d8af00ee3993a42c609dc9a59.1644346040.git.andreyknvl@google.com (mailing list archive)
State New
Headers show
Series [v2] kasan: test: prevent cache merging in kmem_cache_double_destroy | expand

Commit Message

andrey.konovalov@linux.dev Feb. 8, 2022, 6:48 p.m. UTC
From: Andrey Konovalov <andreyknvl@google.com>

With HW_TAGS KASAN and kasan.stacktrace=off, the cache created in the
kmem_cache_double_destroy() test might get merged with an existing one.
Thus, the first kmem_cache_destroy() call won't actually destroy it
but will only decrease the refcount. This causes the test to fail.

Provide an empty constructor for the created cache to prevent the cache
from getting merged.

Fixes: f98f966cd750 ("kasan: test: add test case for double-kmem_cache_destroy()")
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
 lib/test_kasan.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 26a5c9007653..3b413f8c8a71 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -869,11 +869,14 @@  static void kmem_cache_invalid_free(struct kunit *test)
+static void empty_cache_ctor(void *object) { }
 static void kmem_cache_double_destroy(struct kunit *test)
 	struct kmem_cache *cache;
-	cache = kmem_cache_create("test_cache", 200, 0, 0, NULL);
+	/* Provide a constructor to prevent cache merging. */
+	cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor);
 	KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache));