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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 D93CCC433E0 for ; Mon, 1 Jun 2020 18:17:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B42A72068D for ; Mon, 1 Jun 2020 18:17:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591035475; bh=GZhhrHGz8Ys3XjEkj3lsFSGFyE1jA+X30Q4yoTtdXjo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=juu+yWQULup14aeB1bZFDEo1o2AoP4d5zhKqqFVb8yGhdEgU2LRS/6Rj27h4gO8ih /xQQCgMjNcUB2qrorQUWpec6QtYgsyU7CAUCfaSEvpJcI/TZJeHKAhsoT+Tw6Yqkrj At5UB1sUHYoJFNbyBpbIrE1APg9IERwp+NmUYrzQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731324AbgFASRz (ORCPT ); Mon, 1 Jun 2020 14:17:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:39070 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731611AbgFASRp (ORCPT ); Mon, 1 Jun 2020 14:17:45 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2A5852068D; Mon, 1 Jun 2020 18:17:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591035464; bh=GZhhrHGz8Ys3XjEkj3lsFSGFyE1jA+X30Q4yoTtdXjo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=04Fm+2rpQxX/RRws0amOsjQDBkMOcCArIT4rNBu8L6nbgexFZmtfa63YBc/d2Nqc+ fAHacQtMdNvdSkaZVSWONipf8BH2F7vy17nD8jxPC+MVaiBgmftEqofpUKCeHsmJxd vxYiHlD7tdmir0+QfeszvuZn+SXRucV7SUDInI0s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hugh Dickins , Andrew Morton , Song Liu , "Kirill A. Shutemov" , Johannes Weiner , Rik van Riel , Linus Torvalds , Sasha Levin Subject: [PATCH 5.6 132/177] mm,thp: stop leaking unreleased file pages Date: Mon, 1 Jun 2020 19:54:30 +0200 Message-Id: <20200601174059.501360844@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200601174048.468952319@linuxfoundation.org> References: <20200601174048.468952319@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hugh Dickins [ Upstream commit 2f33a706027c94cd4f70fcd3e3f4a17c1ce4ea4b ] When collapse_file() calls try_to_release_page(), it has already isolated the page: so if releasing buffers happens to fail (as it sometimes does), remember to putback_lru_page(): otherwise that page is left unreclaimable and unfreeable, and the file extent uncollapsible. Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS") Signed-off-by: Hugh Dickins Signed-off-by: Andrew Morton Acked-by: Song Liu Acked-by: Kirill A. Shutemov Acked-by: Johannes Weiner Cc: Rik van Riel Cc: [5.4+] Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2005231837500.1766@eggly.anvils Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/khugepaged.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index b679908743cb..ba059e68cf50 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1673,6 +1673,7 @@ static void collapse_file(struct mm_struct *mm, if (page_has_private(page) && !try_to_release_page(page, GFP_KERNEL)) { result = SCAN_PAGE_HAS_PRIVATE; + putback_lru_page(page); goto out_unlock; } -- 2.25.1