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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 E643DC4743D for ; Sat, 5 Jun 2021 03:01:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CCFDB61414 for ; Sat, 5 Jun 2021 03:01:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231132AbhFEDD2 (ORCPT ); Fri, 4 Jun 2021 23:03:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:52696 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231643AbhFEDD1 (ORCPT ); Fri, 4 Jun 2021 23:03:27 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D3C5A61405; Sat, 5 Jun 2021 03:01:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1622862088; bh=ozAlJRxaDWgKU79MQfpohMhmH135SyDBQiDKhYDwAHY=; h=Date:From:To:Subject:In-Reply-To:From; b=ui9zkiBvZeU0kmmdxSIvkp9OdBIaVoiAvmRlvd8Qat5Dz9Mk/ARhSmzopqa/oYvog mvW/BYKI5x03vRXAy1mTm3dLXT4MyG2BrbWRfcT89erawJRp2KW6dzY9MfuLWPA7O2 HF2EhHF/oBKZ+QeNjuzQliRFzY6RPxQkGUu51P0w= Date: Fri, 04 Jun 2021 20:01:27 -0700 From: Andrew Morton To: akpm@linux-foundation.org, linmiaohe@huawei.com, linux-mm@kvack.org, mhocko@suse.com, mike.kravetz@oracle.com, mm-commits@vger.kernel.org, naoya.horiguchi@nec.com, osalvador@suse.de, songmuchun@bytedance.com, torvalds@linux-foundation.org, willy@infradead.org Subject: [patch 07/13] hugetlb: pass head page to remove_hugetlb_page() Message-ID: <20210605030127.7uSeM1M5a%akpm@linux-foundation.org> In-Reply-To: <20210604200040.d8d0406caf195525620c0f3d@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Naoya Horiguchi Subject: hugetlb: pass head page to remove_hugetlb_page() When memory_failure() or soft_offline_page() is called on a tail page of some hugetlb page, "BUG: unable to handle page fault" error can be triggered. remove_hugetlb_page() dereferences page->lru, so it's assumed that the page points to a head page, but one of the caller, dissolve_free_huge_page(), provides remove_hugetlb_page() with 'page' which could be a tail page. So pass 'head' to it, instead. Link: https://lkml.kernel.org/r/20210526235257.2769473-1-nao.horiguchi@gmail.com Fixes: 6eb4e88a6d27 ("hugetlb: create remove_hugetlb_page() to separate functionality") Signed-off-by: Naoya Horiguchi Reviewed-by: Mike Kravetz Reviewed-by: Muchun Song Acked-by: Michal Hocko Reviewed-by: Oscar Salvador Cc: Miaohe Lin Cc: Matthew Wilcox Signed-off-by: Andrew Morton --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/hugetlb.c~hugetlb-pass-head-page-to-remove_hugetlb_page +++ a/mm/hugetlb.c @@ -1793,7 +1793,7 @@ retry: SetPageHWPoison(page); ClearPageHWPoison(head); } - remove_hugetlb_page(h, page, false); + remove_hugetlb_page(h, head, false); h->max_huge_pages--; spin_unlock_irq(&hugetlb_lock); update_and_free_page(h, head); _