From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BFB17C433F5 for ; Sat, 4 Sep 2021 09:18:17 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3D8E061056 for ; Sat, 4 Sep 2021 09:18:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 3D8E061056 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id AC6696B0071; Sat, 4 Sep 2021 05:18:16 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A760F900002; Sat, 4 Sep 2021 05:18:16 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 964EC6B0073; Sat, 4 Sep 2021 05:18:16 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0081.hostedemail.com [216.40.44.81]) by kanga.kvack.org (Postfix) with ESMTP id 82CD76B0071 for ; Sat, 4 Sep 2021 05:18:16 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 2A5BF82499B9 for ; Sat, 4 Sep 2021 09:18:16 +0000 (UTC) X-FDA: 78549339792.20.7A999AA Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by imf28.hostedemail.com (Postfix) with ESMTP id 95F0E90000A1 for ; Sat, 4 Sep 2021 09:18:15 +0000 (UTC) Received: from dggeme703-chm.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4H1prR15G3zbdVl; Sat, 4 Sep 2021 17:14:15 +0800 (CST) Received: from huawei.com (10.175.124.27) by dggeme703-chm.china.huawei.com (10.1.199.99) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.8; Sat, 4 Sep 2021 17:18:12 +0800 From: Miaohe Lin To: CC: , , , , Subject: [PATCH] mm/page_isolation: don't putback unisolated page Date: Sat, 4 Sep 2021 17:18:39 +0800 Message-ID: <20210904091839.20270-1-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggeme703-chm.china.huawei.com (10.1.199.99) X-CFilter-Loop: Reflected X-Rspamd-Queue-Id: 95F0E90000A1 Authentication-Results: imf28.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=huawei.com; spf=pass (imf28.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.188 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com X-Rspamd-Server: rspam01 X-Stat-Signature: dywzxq1hyism3dg7syu9ywgrbmh6dofe X-HE-Tag: 1630747095-270428 Content-Transfer-Encoding: quoted-printable 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: If __isolate_free_page() failed, due to zone watermark check, the page is still on the free list. But this page will be put back to free list again via __putback_isolated_page() now. This may trigger page->flags checks in __free_one_page() if PageReported is set. Or we will corrupt the free lis= t because list_add() will be called for pages already on another list. Fixes: 3c605096d315 ("mm/page_alloc: restrict max order of merging on iso= lated pageblock") Signed-off-by: Miaohe Lin --- mm/page_isolation.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index 9bb562d5d194..7d70d772525c 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -93,10 +93,8 @@ static void unset_migratetype_isolate(struct page *pag= e, unsigned migratetype) buddy_pfn =3D __find_buddy_pfn(pfn, order); buddy =3D page + (buddy_pfn - pfn); =20 - if (!is_migrate_isolate_page(buddy)) { - __isolate_free_page(page, order); - isolated_page =3D true; - } + if (!is_migrate_isolate_page(buddy)) + isolated_page =3D !!__isolate_free_page(page, order); } } =20 --=20 2.23.0