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,URIBL_BLOCKED,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 69AF5C4727D for ; Sun, 4 Oct 2020 03:40:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 408122078B for ; Sun, 4 Oct 2020 03:40:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726352AbgJDDjE (ORCPT ); Sat, 3 Oct 2020 23:39:04 -0400 Received: from mx2.suse.de ([195.135.220.15]:35212 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726263AbgJDDjD (ORCPT ); Sat, 3 Oct 2020 23:39:03 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 491A0AC54; Sun, 4 Oct 2020 03:39:01 +0000 (UTC) Subject: Re: [PATCH v10 0/7] Introduce sendpage_ok() to detect misused sendpage in network related drivers To: David Miller Cc: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, netdev@vger.kernel.org, open-iscsi@googlegroups.com, linux-scsi@vger.kernel.org, ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org, chaitanya.kulkarni@wdc.com, cleech@redhat.com, hch@lst.de, amwang@redhat.com, eric.dumazet@gmail.com, hare@suse.de, idryomov@gmail.com, jack@suse.com, jlayton@kernel.org, axboe@kernel.dk, lduncan@suse.com, michaelc@cs.wisc.edu, mskorzhinskiy@solarflare.com, philipp.reisner@linbit.com, sagi@grimberg.me, vvs@virtuozzo.com, vbabka@suse.com References: <20201002082734.13925-1-colyli@suse.de> <20201002.152829.1002796270145913943.davem@davemloft.net> From: Coly Li Autocrypt: addr=colyli@suse.de; 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Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <20201002.152829.1002796270145913943.davem@davemloft.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org On 2020/10/3 06:28, David Miller wrote: > From: Coly Li > Date: Fri, 2 Oct 2020 16:27:27 +0800 > >> As Sagi Grimberg suggested, the original fix is refind to a more common >> inline routine: >> static inline bool sendpage_ok(struct page *page) >> { >> return (!PageSlab(page) && page_count(page) >= 1); >> } >> If sendpage_ok() returns true, the checking page can be handled by the >> concrete zero-copy sendpage method in network layer. > > Series applied. > >> The v10 series has 7 patches, fixes a WARN_ONCE() usage from v9 series, > ... > > I still haven't heard from you how such a fundamental build failure > was even possible. > Hi David, Here is the detail steps how I leaked this uncompleted patch to you, 1) Add WARN_ONCE() as WARN_ON() to kernel_sendpage(). Maybe I was still hesitating when I typed WARN_ONCE() on keyboard. 2) Generate the patches, prepare to post 3) Hmm, compiling failed, oh it is WARN_ONCE(). Yeah, WARN_ONCE() might be more informative and better. 4) Modify to use WARN_ONCE() and compile and try, looks fine. 5) Re-generate the patches to overwrite the previous ones. 6) Post the patches. The missing part was, before I post the patches, I should do rebase and commit the change, but (interrupted by other stuffs) it skipped in my mind. Although I regenerated the series but the change was not included. The result was, uncompleted patch posted and the second-half change still stayed in my local file. > If the v9 patch series did not even compile, how in the world did you > perform functional testing of these changes? > Only 0002-net-add-WARN_ONCE-in-kernel_sendpage-for-improper-ze.patch was tested in v9 series, other tests were done in previous versions. > Please explain this to me, instead of just quietly fixing it and > posting an updated series. And not all the patches in the series were tested. Here is the testing coverage of the series: The following ones were tested and verified to break nothing and avoid the mm corruption and panic, 0001-net-introduce-helper-sendpage_ok-in-include-linux-ne.patch 0002-net-add-WARN_ONCE-in-kernel_sendpage-for-improper-ze.patch 0003-nvme-tcp-check-page-by-sendpage_ok-before-calling-ke.patch 0006-scsi-libiscsi-use-sendpage_ok-in-iscsi_tcp_segment_m.patch The following ones were not tested, due to complicated environment setup, 0005-drbd-code-cleanup-by-using-sendpage_ok-to-check-page.patch 0007-libceph-use-sendpage_ok-in-ceph_tcp_sendpage.patch This patch I didn't explicitly test, due to lack of knowledge to modify network code to trigger a buggy condition. It just went with other tested patches, 0004-tcp-use-sendpage_ok-to-detect-misused-.sendpage.patch Back to the built failure, I don't have excuse for leaking this uncompleted version to you. Of cause I will try to avoid to inefficiently occupy maintainer's time by such silly mess up. Thanks for your review and the thorough maintenance. Coly Li