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=-11.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 82BD7C433EF for ; Fri, 17 Sep 2021 21:59:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69A406113A for ; Fri, 17 Sep 2021 21:59:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343750AbhIQWBO (ORCPT ); Fri, 17 Sep 2021 18:01:14 -0400 Received: from www62.your-server.de ([213.133.104.62]:35142 "EHLO www62.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229589AbhIQWBN (ORCPT ); Fri, 17 Sep 2021 18:01:13 -0400 Received: from sslproxy02.your-server.de ([78.47.166.47]) by www62.your-server.de with esmtpsa (TLSv1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.92.3) (envelope-from ) id 1mRLta-0003vX-Rc; Fri, 17 Sep 2021 23:59:46 +0200 Received: from [85.1.206.226] (helo=linux.home) by sslproxy02.your-server.de with esmtpsa (TLSv1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mRLta-000XXb-Ga; Fri, 17 Sep 2021 23:59:46 +0200 Subject: Re: [syzbot] general protection fault in bpf_skb_cgroup_id To: syzbot , andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, davem@davemloft.net, hawk@kernel.org, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com References: <000000000000f152a305cc374d7b@google.com> From: Daniel Borkmann Message-ID: Date: Fri, 17 Sep 2021 23:59:46 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <000000000000f152a305cc374d7b@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Authenticated-Sender: daniel@iogearbox.net X-Virus-Scanned: Clear (ClamAV 0.103.2/26297/Thu Sep 16 15:59:37 2021) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/17/21 11:06 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 2865ba82476a Merge git://git.kernel.org/pub/scm/linux/kern.. > git tree: bpf > console output: https://syzkaller.appspot.com/x/log.txt?x=15089853300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c31c0936547df9ea > dashboard link: https://syzkaller.appspot.com/bug?extid=33f36d0754d4c5c0e102 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14dbd7ed300000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1586f83b300000 > > Bisection is inconclusive: the first bad commit could be any of: > > 0e6491b55970 bpf: Add oversize check before call kvcalloc() > 2f1aaf3ea666 bpf, mm: Fix lockdep warning triggered by stack_map_get_build_id_offset() > 8520e224f547 bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode > 3a029e1f3d6e selftests/bpf: Fix build of task_pt_regs test for arm64 > d8079d8026f8 bpf, selftests: Add cgroup v1 net_cls classid helpers > 43d2b88c29f2 bpf, selftests: Add test case for mixed cgroup v1/v2 > 49ca6153208f bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause > 2865ba82476a Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16b5ccdd300000 I'll take a look at the report. Thanks, Daniel