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=-1.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, 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 9EA77C2BC61 for ; Tue, 30 Oct 2018 19:38:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6229E20657 for ; Tue, 30 Oct 2018 19:38:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="uCVnlT2+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6229E20657 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; 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Tue, 30 Oct 2018 19:38:11 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id w9UJc4L2013086 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 30 Oct 2018 19:38:05 GMT Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w9UJc4QC021767; Tue, 30 Oct 2018 19:38:04 GMT Received: from [10.209.243.127] (/10.209.243.127) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 30 Oct 2018 12:38:04 -0700 Subject: Re: WARNING in rds_message_alloc_sgs To: syzbot , linux-rdma@vger.kernel.org, netdev@vger.kernel.org, rds-devel@oss.oracle.com, syzkaller-bugs@googlegroups.com References: <0000000000003c6b7b0579772ff3@google.com> Cc: davem@davemloft.net, linux-kernel@vger.kernel.org From: Santosh Shilimkar Organization: Oracle Corporation Message-ID: Date: Tue, 30 Oct 2018 12:38:02 -0700 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <0000000000003c6b7b0579772ff3@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9062 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=907 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810300165 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/30/2018 12:28 PM, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit:    6201f31a39f8 Add linux-next specific files for 20181030 > git tree:       linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1397d06d400000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=2a22859d870756c1 > dashboard link: > https://syzkaller.appspot.com/bug?extid=26de17458aeda9d305d8 > compiler:       gcc (GCC) 8.0.1 20180413 (experimental) > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10bb52eb400000 > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=118bdfc5400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+26de17458aeda9d305d8@syzkaller.appspotmail.com > > WARNING: CPU: 0 PID: 19789 at net/rds/message.c:316 > rds_message_alloc_sgs+0x10c/0x160 net/rds/message.c:316 > Kernel panic - not syncing: panic_on_warn set ... Looks like this kernel build has panic on warn enabled which triggers panic for " WARN_ON(!nr_pages)" case. Will look into it. Thanks !! Regards, Santosh