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Mon, 18 Sep 2023 13:11:50 +0800 From: Jinjie Ruan To: , , , , , , , , CC: Subject: [PATCH RESEND 1/2] mm/damon/core-test: Fix memory leak in damon_new_region() Date: Mon, 18 Sep 2023 13:10:43 +0800 Message-ID: <20230918051044.3814018-2-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230918051044.3814018-1-ruanjinjie@huawei.com> References: <20230918051044.3814018-1-ruanjinjie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.90.53.73] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemi500008.china.huawei.com (7.221.188.139) X-CFilter-Loop: Reflected X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 2E9D840005 X-Stat-Signature: p3p796tsqs5huxn9nssnh1qgxs49geib X-Rspam-User: X-HE-Tag: 1695013915-203626 X-HE-Meta: U2FsdGVkX19m0OJJYny+xvVUElJR4cx580NwBQtApHgxQUwiK0xQ4z+nasiyQkHNe7Ym3fV9cpvu1ZUka9ASFwY3DjT++uKsA7iPu6mvPz5WQ1SHSH4nq+lhz1baHz90cjAWFpQIODhh9QyYTyudJMGga7xbgTDKgx1mNRjRAeT86zgg1m1fbk21TwFEQ0GEOfjW+xKN0mHIpzYbA2SDrQ7roljQJCMfZK3svJI7pJbu87d5ml+Pkx4YV0MPhqxwFe39R/3VbB1woTcjbK9DyLsaLrouQK11s+OExAjnXf3xF8SZSAgpnMa02bE7cLxGoAng0gkbdU4MMtxsnkkvLSEGLhqDYCin1RdVC0yryPMtz2aJaXA7O8Y4xtV1dOVIvBKdGcEioWuZJevQcK72lm2FztX9ijgpjK++Tfv3NjzIQ64n7i3PpqGb4mMzg1tyIM/a59DgZ0JLy9KKnC6YNVtlUwgfSAKdGAMsWWfpi4GR/4LdNkglFFQUfVmezR3iDfWV6xiBCgY8Ifp3u4FKgoZbdx2qQX0D2WVJm4sXtyaDhsM67X3TbrKTW859Ype1EGaliYiNzE+a+D3Me2OvOikmIAvfDdhSGL5Yx0vdsn4NBe/cIrgN9n30MRvyIkCQynfqtpLZNyjJxzTB+t8rdLxqpYdobhS1l/Cb4dMRuDGii0Vd5/0N6zBdPtcW8jV/1awvutONs3kMhsABM3AbIcr8hdnhsX/J7U1aaZHUlLBVn1fq+Gv3XNBojNEzOBVsBUMiYX9AHLAhrwob9zz9DG5wiYATTOcW0raTu5BssFkpec7Yw/PlSeBlOC7GSGlpkq8mkpr24eMoDhxhhH7dXdqbqh8AQdBtaMaxuANOy3lj+kze/beUPqQffC0sMnSOa+Esf5xgD0j+Jz40NQPMDKbiCn7pu3hVXUEfIBcP8WcHhYe3UkK9jBRkOvdn35jmFgUtJIsJ5NdkhgNCmMG a6WKcAzT hP0sQt9vNb4NGpDhkzYuyFtdjcqPbwZe7byP8Xa/LjhmQfJlML5GHff4apvs6cL+MRz36teFGQwZTwAMbBko7Q9519Yxqr4T3ch2H6y1VDloG8RsAV5ctuDYr4z2hdZzLQS7Oj2PE/zTnnZst9FN0mgJeUY+w0By1xx9eWA2QwQcY3QyXR6q4CMmkAhhukIAUCpB0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The damon_region which is allocated by kmem_cache_alloc() in damon_new_region() in damon_test_regions() and damon_test_update_monitoring_result() are not freed and it causes below memory leak. So use damon_free_region() to free it. unreferenced object 0xffff2b49c3edc000 (size 56): comm "kunit_try_catch", pid 338, jiffies 4294895280 (age 557.084s) hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 49 2b ff ff ............I+.. backtrace: [<0000000088e71769>] slab_post_alloc_hook+0xb8/0x368 [<00000000b528f67c>] kmem_cache_alloc+0x168/0x284 [<000000008603f022>] damon_new_region+0x28/0x54 [<00000000a3b8c64e>] damon_test_regions+0x38/0x270 [<00000000559c4801>] kunit_try_run_case+0x50/0xac [<000000003932ed49>] kunit_generic_run_threadfn_adapter+0x20/0x2c [<000000003c3e9211>] kthread+0x124/0x130 [<0000000028f85bdd>] ret_from_fork+0x10/0x20 unreferenced object 0xffff2b49c5b20000 (size 56): comm "kunit_try_catch", pid 354, jiffies 4294895304 (age 556.988s) hex dump (first 32 bytes): 03 00 00 00 00 00 00 00 07 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 96 00 00 00 49 2b ff ff ............I+.. backtrace: [<0000000088e71769>] slab_post_alloc_hook+0xb8/0x368 [<00000000b528f67c>] kmem_cache_alloc+0x168/0x284 [<000000008603f022>] damon_new_region+0x28/0x54 [<00000000ca019f80>] damon_test_update_monitoring_result+0x18/0x34 [<00000000559c4801>] kunit_try_run_case+0x50/0xac [<000000003932ed49>] kunit_generic_run_threadfn_adapter+0x20/0x2c [<000000003c3e9211>] kthread+0x124/0x130 [<0000000028f85bdd>] ret_from_fork+0x10/0x20 Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests") Fixes: f4c978b6594b ("mm/damon/core-test: add a test for damon_update_monitoring_results()") Signed-off-by: Jinjie Ruan --- mm/damon/core-test.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h index 6cc8b245586d..255f8c925c00 100644 --- a/mm/damon/core-test.h +++ b/mm/damon/core-test.h @@ -34,6 +34,7 @@ static void damon_test_regions(struct kunit *test) KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t)); damon_free_target(t); + damon_free_region(r); } static unsigned int nr_damon_targets(struct damon_ctx *ctx) @@ -316,6 +317,8 @@ static void damon_test_update_monitoring_result(struct kunit *test) damon_update_monitoring_result(r, &old_attrs, &new_attrs); KUNIT_EXPECT_EQ(test, r->nr_accesses, 150); KUNIT_EXPECT_EQ(test, r->age, 20); + + damon_free_region(r); } static void damon_test_set_attrs(struct kunit *test)