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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1677ECCA480 for ; Thu, 23 Jun 2022 08:33:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230248AbiFWIdO (ORCPT ); Thu, 23 Jun 2022 04:33:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45356 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229528AbiFWIdL (ORCPT ); Thu, 23 Jun 2022 04:33:11 -0400 Received: from out30-44.freemail.mail.aliyun.com (out30-44.freemail.mail.aliyun.com [115.124.30.44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48E35DEB5; Thu, 23 Jun 2022 01:33:10 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R211e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046051;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=19;SR=0;TI=SMTPD_---0VHAoIhL_1655973184; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VHAoIhL_1655973184) by smtp.aliyun-inc.com; Thu, 23 Jun 2022 16:33:05 +0800 Message-ID: <1655972550.3746855-1-xuanzhuo@linux.alibaba.com> Subject: Re: [syzbot] WARNING: suspicious RCU usage (5) Date: Thu, 23 Jun 2022 16:22:30 +0800 From: Xuan Zhuo To: syzbot Cc: alobakin@pm.me, bp@alien8.de, daniel@iogearbox.net, hpa@zytor.com, jmattson@google.com, john.fastabend@gmail.com, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, netdev@vger.kernel.org, pbonzini@redhat.com, seanjc@google.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org References: <000000000000b9edeb05e1aca987@google.com> <0000000000008b8cd205e2187ea2@google.com> In-Reply-To: <0000000000008b8cd205e2187ea2@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 23 Jun 2022 00:35:13 -0700, syzbot wrote: > syzbot has bisected this issue to: > > commit c2ff53d8049f30098153cd2d1299a44d7b124c57 > Author: Xuan Zhuo > Date: Thu Feb 18 20:50:02 2021 +0000 > > net: Add priv_flags for allow tx skb without linear > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11596838080000 > start commit: a5b00f5b78b7 Merge branch 'hns3-fixres' > git tree: net > final oops: https://syzkaller.appspot.com/x/report.txt?x=13596838080000 > console output: https://syzkaller.appspot.com/x/log.txt?x=15596838080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=20ac3e0ebf0db3bd > dashboard link: https://syzkaller.appspot.com/bug?extid=9cbc6bed3a22f1d37395 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=143b22abf00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=125194eff00000 > > Reported-by: syzbot+9cbc6bed3a22f1d37395@syzkaller.appspotmail.com > Fixes: c2ff53d8049f ("net: Add priv_flags for allow tx skb without linear") I think it's unlikely that my patch is causing the problem, because my patch is very simple and doesn't have any effect on the kernel. I don't know if there is something wrong. I used the above config (make olddefconfig) to compile this commit, and it crashed directly after starting it in qemu. Thanks. > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection