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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 99FA6C4338F for ; Fri, 23 Jul 2021 01:51:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1EEFF60EBE for ; Fri, 23 Jul 2021 01:51:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 1EEFF60EBE 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 635B46B005D; Thu, 22 Jul 2021 21:51:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5E6B46B006C; Thu, 22 Jul 2021 21:51:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4D45E6B0070; Thu, 22 Jul 2021 21:51:17 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0066.hostedemail.com [216.40.44.66]) by kanga.kvack.org (Postfix) with ESMTP id 3115E6B005D for ; Thu, 22 Jul 2021 21:51:17 -0400 (EDT) Received: from smtpin33.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id C34B4231A7 for ; Fri, 23 Jul 2021 01:51:16 +0000 (UTC) X-FDA: 78392174952.33.21C740B Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by imf24.hostedemail.com (Postfix) with ESMTP id 25CE9B00083C for ; Fri, 23 Jul 2021 01:51:16 +0000 (UTC) Received: from dggeme703-chm.china.huawei.com (unknown [172.30.72.57]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4GWBwL0q2xz1CMrc; Fri, 23 Jul 2021 09:45:22 +0800 (CST) Received: from [10.174.177.180] (10.174.177.180) 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 15.1.2176.2; Fri, 23 Jul 2021 09:51:10 +0800 Subject: Re: linux-5.13.2: warning from kernel/rcu/tree_plugin.h:359 To: Greg KH , Matthew Wilcox CC: Zhouyi Zhou , Chris Clayton , Oleksandr Natalenko , Boqun Feng , , linux-kernel , , Chris Rankin , Josh Triplett , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Joel Fernandes , rcu , Andrew Morton , Linux-MM , "Huang, Ying" References: <5812280.fcLxn8YiTP@natalenko.name> <2237123.PRLUojbHBq@natalenko.name> From: Miaohe Lin Message-ID: <01fef2db-bd7e-12b6-ec21-2addd02e7062@huawei.com> Date: Fri, 23 Jul 2021 09:51:09 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.180] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggeme703-chm.china.huawei.com (10.1.199.99) X-CFilter-Loop: Reflected Authentication-Results: imf24.hostedemail.com; dkim=none; spf=pass (imf24.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.255 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com; dmarc=pass (policy=none) header.from=huawei.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 25CE9B00083C X-Stat-Signature: tzmfkzjg8pdnyepmzk43iiyebmtenykf X-HE-Tag: 1627005076-276952 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: On 2021/7/22 22:00, Greg KH wrote: > On Thu, Jul 22, 2021 at 03:26:52PM +0200, Greg KH wrote: >> On Thu, Jul 22, 2021 at 01:36:02PM +0100, Matthew Wilcox wrote: >>> On Thu, Jul 22, 2021 at 04:57:57PM +0800, Zhouyi Zhou wrote: >>>> Thanks for reviewing, >>>> >>>> What I have deduced from the dmesg is: >>>> In function do_swap_page, >>>> after invoking >>>> 3385 si = get_swap_device(entry); /* rcu_read_lock */ >>>> and before >>>> 3561 out: >>>> 3562 if (si) >>>> 3563 put_swap_device(si); >>>> The thread got scheduled out in >>>> 3454 locked = lock_page_or_retry(page, vma->vm_mm, vmf->flags); >>>> >>>> I am only familiar with Linux RCU subsystem, hope mm people can solve our >>>> confusions. >>> >>> I don't understamd why you're still talking. The problem is understood. >>> You need to revert the unnecessary backport of 2799e77529c2 and >>> 2efa33fc7f6e >> >> Sorry for the delay, will go do so in a minute... > > Both now reverted from 5.10.y and 5.13.y. > I browsed my previous backport notifying email and found that these two patches are also backported into 5.12. And it seems it's missed. Thanks. > thanks, > > greg k-h > . >