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=-16.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_IN_DEF_DKIM_WL 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 3188CC388F9 for ; Wed, 21 Oct 2020 13:10:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A50BB22249 for ; Wed, 21 Oct 2020 13:10:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="wRExLQTE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2442850AbgJUNKA (ORCPT ); Wed, 21 Oct 2020 09:10:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52826 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2441166AbgJUNJ6 (ORCPT ); Wed, 21 Oct 2020 09:09:58 -0400 Received: from mail-qk1-x742.google.com (mail-qk1-x742.google.com [IPv6:2607:f8b0:4864:20::742]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C221EC0613CE for ; Wed, 21 Oct 2020 06:09:56 -0700 (PDT) Received: by mail-qk1-x742.google.com with SMTP id 188so2231649qkk.12 for ; Wed, 21 Oct 2020 06:09:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=l8CzYNxUOxYJ9aS4i6ldcbySxqQpPBvkizlmhAVK1Co=; b=wRExLQTECGOE6jf/VWRwbwVxr2VzsZt3CqPfle3HfV/kirzws3CgoddXEVnYi7e/0v hvlUKo/f89fSMEfdji50yrCYfZmHNc72aZuxR8l7e0N/p43es+hPsodeQarDPpfHteGc ktEB8kylky6+cLzdbQhKtlCp+/3qqz/cjXg7D7xnMZ45HKjfrsVaZvd1US2fv+OzMdSV agDSrVTPk2zF6WQLhhx6427HR8wGP21QnM9iL3GWJf4Uf/SBrbI3a31F7MeaOjiT7SF3 xH83LXe6jfcnPwC5tO/urEq9Rb6RLyTMqpBj1ipv0jkkpPCrUXDK7c+l1Zyo9O2eHkbc oWHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=l8CzYNxUOxYJ9aS4i6ldcbySxqQpPBvkizlmhAVK1Co=; b=GLqUXmOrTDK+hAmAKk/OwbOja9zvnKiIxqan2+9as6oRgFEDdGvtonLSf6FPUKADrv o/uyEMchbYqd4LDdhAPW4GWH6g/ikNpx70Fk9ya5bzeY6qyLq3wYSbRZ4rOK/uTb5plU z/q072SPZJERxpYkpRvZwUXkZ+e1OiMPaTi6d6rLPPOKex9LQCjvZEvbkQwWoEm6ps0a v1jPXBfLnOUCLO8Fr7vf5NxztD9yCu7ebQxUzBHXN+WLdWIU6EWUV5NdP/clnp847Kef TA0Oo+dKyVYL+ys24gXsk2kcfv72+XnuSEdFrJYHkjt9hAyG3ehuVWZBrfS8ES2AVWzX hXmw== X-Gm-Message-State: AOAM532PNS5rRmeXEmrYHANZbFwjZ6tTF/SMoB6qLT5iMgwM0LYEnSUB CvfIE1wnLLnca9GymgDbhrPlttbVx0tHoEiq+wnTcg== X-Google-Smtp-Source: ABdhPJychB7r3nWhKMzXrze1M2JHn0D2/XGPU2wLFpddHzsaCbpUAVQZsHAyysxcjLj/O8PcvOF+zfMijACuDowT95M= X-Received: by 2002:a05:620a:1188:: with SMTP id b8mr3124172qkk.265.1603285795684; Wed, 21 Oct 2020 06:09:55 -0700 (PDT) MIME-Version: 1.0 References: <000000000000e921b305b18ba0a7@google.com> <000000000000f9990805b1cfab64@google.com> In-Reply-To: <000000000000f9990805b1cfab64@google.com> From: Dmitry Vyukov Date: Wed, 21 Oct 2020 15:09:44 +0200 Message-ID: Subject: Re: BUG: using __this_cpu_read() in preemptible code in trace_hardirqs_on To: syzbot Cc: LKML , Ingo Molnar , Ingo Molnar , netdev , Peter Zijlstra , Steven Rostedt , syzkaller-bugs , Will Deacon Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Fri, Oct 16, 2020 at 10:33 PM syzbot wrote: > > syzbot has bisected this issue to: > > commit 4d004099a668c41522242aa146a38cc4eb59cb1e > Author: Peter Zijlstra > Date: Fri Oct 2 09:04:21 2020 +0000 > > lockdep: Fix lockdep recursion > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=174a766f900000 > start commit: 9ff9b0d3 Merge tag 'net-next-5.10' of git://git.kernel.org.. > git tree: net-next > final oops: https://syzkaller.appspot.com/x/report.txt?x=14ca766f900000 > console output: https://syzkaller.appspot.com/x/log.txt?x=10ca766f900000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d13c3fa80bc4bcc1 > dashboard link: https://syzkaller.appspot.com/bug?extid=53f8ce8bbc07924b6417 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15b63310500000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1565657f900000 > > Reported-by: syzbot+53f8ce8bbc07924b6417@syzkaller.appspotmail.com > Fixes: 4d004099a668 ("lockdep: Fix lockdep recursion") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection This is now one of top crashers with 190K crashes in the past 12 days: https://syzkaller.appspot.com/bug?id=e7cbd9d7047a1c4e14bbdc194a7d87de1f168289 This is now almost the only bug syzbot triggers.