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=-8.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 A1F4FC2D0A8 for ; Mon, 28 Sep 2020 07:56:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4268E2311C for ; Mon, 28 Sep 2020 07:56:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="crzRZ5WE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726573AbgI1H4t (ORCPT ); Mon, 28 Sep 2020 03:56:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35640 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726547AbgI1H4t (ORCPT ); Mon, 28 Sep 2020 03:56:49 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B717C0613CE; Mon, 28 Sep 2020 00:56:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=DPKsOe4ba3eqRNFOJkwafyOb5NNcsVGyhf7wFCh0JJw=; b=crzRZ5WE98TMTp3swk6K9/gew2 eWzYPuFqMWumU2/LErko7uRcEiknFwK7OYsi/Gt/XY7BdqDoC4AFLoFtR+zV5EukB9GMm0Z8HmTLd jDWdTSKcNee3YEyx2Ojiu3xEUCmSiTpCxmG9hbXydK94ZsXL/OK+grfCw1mTpttMxSg1DfaT4xKy/ qIXuO6Cl445qklZk1tO6FLfkb0IKz5oGeI/KMOmQSh+EKLKsTeH4++YfYiYO2soPWeWt4w3MZjjex ZMg5Y4I8p24h/fu+ZTCVfdeFTIFL+BySja4xStflWqWAzrC3X3v0C04LeV5TPK6CFJU7WblHKK9Ky QfJOXdeg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kMo18-00042K-K7; Mon, 28 Sep 2020 07:56:15 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 64C04303F45; Mon, 28 Sep 2020 09:56:12 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 206F720BCC934; Mon, 28 Sep 2020 09:56:12 +0200 (CEST) Date: Mon, 28 Sep 2020 09:56:12 +0200 From: Peter Zijlstra To: Dmitry Vyukov Cc: syzbot , Ingo Molnar , Will Deacon , Alexei Starovoitov , bpf , Daniel Borkmann , David Miller , David Ahern , Florian Fainelli , hawk@kernel.org, Ido Schimmel , Jakub Kicinski , Jiri Pirko , Johannes Berg , John Fastabend , Martin KaFai Lau , Alexey Kuznetsov , LKML , Michal Kubecek , netdev , petrm@mellanox.com, Roopa Prabhu , Song Liu , syzkaller-bugs , Yonghong Song , Hideaki YOSHIFUJI , Tetsuo Handa , Boqun Feng Subject: Re: WARNING in print_bfs_bug Message-ID: <20200928075612.GB2594@hirez.programming.kicks-ass.net> References: <000000000000d73b12059608812b@google.com> <000000000000568a9105963ad7ac@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Sun, Sep 27, 2020 at 10:57:24AM +0200, Dmitry Vyukov wrote: > On Thu, Oct 31, 2019 at 9:39 PM syzbot > wrote: > > > > syzbot has found a reproducer for the following crash on: > > > > HEAD commit: 49afce6d Add linux-next specific files for 20191031 > > git tree: linux-next > > console output: https://syzkaller.appspot.com/x/log.txt?x=11eea36ce00000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3c5f119b33031056 > > dashboard link: https://syzkaller.appspot.com/bug?extid=62ebe501c1ce9a91f68c > > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c162f4e00000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131b5eb8e00000 > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+62ebe501c1ce9a91f68c@syzkaller.appspotmail.com > > This is another LOCKDEP-related top crasher. syzkaller finds just this > one (see below). > I think we need to disable LOCKDEP temporary until this and other > LOCKDEP issues are resolved. I've filed > https://github.com/google/syzkaller/issues/2140 to track > disabling/enabling. There is a potential patch for it: https://lkml.kernel.org/r/20200917080210.108095-1-boqun.feng@gmail.com Let me try and digest it.