From nobody Thu Apr 2 21:32:23 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B81D3C6FA8B for ; Tue, 20 Sep 2022 13:12:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230271AbiITNMV (ORCPT ); Tue, 20 Sep 2022 09:12:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46886 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229655AbiITNMS (ORCPT ); Tue, 20 Sep 2022 09:12:18 -0400 Received: from SHSQR01.spreadtrum.com (mx1.unisoc.com [222.66.158.135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9488A402E2 for ; Tue, 20 Sep 2022 06:12:16 -0700 (PDT) Received: from SHSend.spreadtrum.com (bjmbx01.spreadtrum.com [10.0.64.7]) by SHSQR01.spreadtrum.com with ESMTPS id 28KDBRE4083462 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NO); Tue, 20 Sep 2022 21:11:27 +0800 (CST) (envelope-from zhaoyang.huang@unisoc.com) Received: from bj03382pcu.spreadtrum.com (10.0.74.65) by BJMBX01.spreadtrum.com (10.0.64.7) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Tue, 20 Sep 2022 21:11:28 +0800 From: "zhaoyang.huang" To: Andrew Morton , Catalin Marinas , Matthew Wilcox , Zhaoyang Huang , , , , Subject: [RFC PATCH] mm: track bad page via kmemleak Date: Tue, 20 Sep 2022 21:11:08 +0800 Message-ID: <1663679468-16757-1-git-send-email-zhaoyang.huang@unisoc.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-Originating-IP: [10.0.74.65] X-ClientProxiedBy: SHCAS03.spreadtrum.com (10.0.1.207) To BJMBX01.spreadtrum.com (10.0.64.7) X-MAIL: SHSQR01.spreadtrum.com 28KDBRE4083462 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Zhaoyang Huang Bad pages will failed go back to allocator and leaved as orphan pages, track them down via kmemleak. Signed-off-by: Zhaoyang Huang --- mm/page_alloc.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index e5486d4..24f682e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1408,7 +1408,7 @@ static __always_inline bool free_pages_prepare(struct= page *page, __memcg_kmem_uncharge_page(page, order); reset_page_owner(page, order); page_table_check_free(page, order); - return false; + goto err; } =20 /* @@ -1442,7 +1442,7 @@ static __always_inline bool free_pages_prepare(struct= page *page, if (check_free) bad +=3D check_free_page(page); if (bad) - return false; + goto err; =20 page_cpupid_reset_last(page); page->flags &=3D ~PAGE_FLAGS_CHECK_AT_PREP; @@ -1486,6 +1486,10 @@ static __always_inline bool free_pages_prepare(struc= t page *page, debug_pagealloc_unmap_pages(page, 1 << order); =20 return true; +err: + kmemleak_alloc(page_address(page), PAGE_SIZE << order, 1, GFP_KERNEL); + return false; + } =20 #ifdef CONFIG_DEBUG_VM --=20 1.9.1