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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l185-20020a6391c2000000b0052cc0c1c39csi6387762pge.815.2023.05.27.09.11.10; Sat, 27 May 2023 09:11:25 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231684AbjE0PUo (ORCPT + 99 others); Sat, 27 May 2023 11:20:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43682 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229490AbjE0PUo (ORCPT ); Sat, 27 May 2023 11:20:44 -0400 Received: from out30-98.freemail.mail.aliyun.com (out30-98.freemail.mail.aliyun.com [115.124.30.98]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1AE42D8; Sat, 27 May 2023 08:20:40 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R821e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=guwen@linux.alibaba.com;NM=1;PH=DS;RN=10;SR=0;TI=SMTPD_---0Vja8aMX_1685200823; Received: from 30.13.48.72(mailfrom:guwen@linux.alibaba.com fp:SMTPD_---0Vja8aMX_1685200823) by smtp.aliyun-inc.com; Sat, 27 May 2023 23:20:36 +0800 Message-ID: <34e6b564-a658-4461-ebec-f53dd80a9125@linux.alibaba.com> Date: Sat, 27 May 2023 23:20:22 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.9.1 Subject: Re: [PATCH net 2/2] net/smc: Don't use RMBs not mapped to new link in SMCRv2 ADD LINK To: Wenjia Zhang , kgraul@linux.ibm.com, jaka@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <1685101741-74826-1-git-send-email-guwen@linux.alibaba.com> <1685101741-74826-3-git-send-email-guwen@linux.alibaba.com> From: Wen Gu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-10.0 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2023/5/27 18:22, Wenjia Zhang wrote: > > I'm wondering if this crash is introduced by the first fix patch you wrote. > > Thanks, > Wenjia Hi Wenjia, No, the crash can be reproduced without my two patches by the following steps: 1. Each side activates only one RNIC firstly and set the default sndbuf/RMB sizes to more than 16KB, such as 64KB, through sysctl net.smc.{wmem | rmem}. (The reason why initial sndbufs/RMBs size needs to be larger than 16KB will be explained later) 2. Use SMCRv2 in any test, just to create a link group that has some alloced RMBs. Example of step #1 #2: [server] smcr ueid add 1234 sysctl net.smc.rmem=65536 sysctl net.smc.wmem=65536 smc_run sockperf sr --tcp [client] smcr ueid add 1234 sysctl net.smc.rmem=65536 sysctl net.smc.wmem=65536 smc_run sockperf pp --tcp -i -t