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[23.128.96.37]) by mx.google.com with ESMTPS id l65-20020a633e44000000b0056959099f35si7569454pga.146.2023.09.18.01.07.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Sep 2023 01:07:14 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=huawei.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id BE59C80C5F9A; Mon, 18 Sep 2023 00:52:33 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240396AbjIRHv5 (ORCPT + 27 others); Mon, 18 Sep 2023 03:51:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60648 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240567AbjIRHvZ (ORCPT ); Mon, 18 Sep 2023 03:51:25 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0F041723; Mon, 18 Sep 2023 00:49:35 -0700 (PDT) Received: from kwepemi500008.china.huawei.com (unknown [172.30.72.56]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4RpxdV6RbqztS88; Mon, 18 Sep 2023 15:44:30 +0800 (CST) Received: from huawei.com (10.90.53.73) by kwepemi500008.china.huawei.com (7.221.188.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Mon, 18 Sep 2023 15:48:42 +0800 From: Jinjie Ruan To: , , , , , , , , CC: Subject: [PATCH v2 1/2] mm/damon/core-test: Fix memory leak in damon_new_region() Date: Mon, 18 Sep 2023 15:47:58 +0800 Message-ID: <20230918074759.3895339-2-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230918074759.3895339-1-ruanjinjie@huawei.com> References: <20230918074759.3895339-1-ruanjinjie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.90.53.73] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemi500008.china.huawei.com (7.221.188.139) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Mon, 18 Sep 2023 00:52:33 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777361942009720087 X-GMAIL-MSGID: 1777361942009720087 When CONFIG_DAMON_KUNIT_TEST=y and making CONFIG_DEBUG_KMEMLEAK=y and CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN=y, the below memory leak is detected. 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. So use damon_free_region() to free it. After applying this patch, the following memory leak is never detected. 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 Reviewed-by: SeongJae Park --- v2: - Replace the damon_del_region() with damon_destroy_region() rather than calling damon_free_region(). - Update the commit message. --- mm/damon/core-test.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h index 79f1f12e0dd5..3959be35b901 100644 --- a/mm/damon/core-test.h +++ b/mm/damon/core-test.h @@ -30,7 +30,7 @@ static void damon_test_regions(struct kunit *test) damon_add_region(r, t); KUNIT_EXPECT_EQ(test, 1u, damon_nr_regions(t)); - damon_del_region(r, t); + damon_destroy_region(r, t); KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t)); damon_free_target(t); @@ -321,6 +321,8 @@ 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)