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=-13.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 EED06C43381 for ; Thu, 28 Mar 2019 08:21:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BE5A42075E for ; Thu, 28 Mar 2019 08:21:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="VM8lzwwA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726445AbfC1IVq (ORCPT ); Thu, 28 Mar 2019 04:21:46 -0400 Received: from mail-it1-f196.google.com ([209.85.166.196]:33985 "EHLO mail-it1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726252AbfC1IVp (ORCPT ); Thu, 28 Mar 2019 04:21:45 -0400 Received: by mail-it1-f196.google.com with SMTP id l4so7698231ite.1 for ; Thu, 28 Mar 2019 01:21:45 -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=2s0o2wptDgdU1RZ20vo/vyQzS4JpdfMk071h3j4mQfo=; b=VM8lzwwArlqnDhvMa8tbC5yEvNN0g2LrTFRuW6RQMMKBNlbmwnnqzJNiRsmDL/8W1y lmIb3eGigEXP2e6mA/mptlpgYHtM63pe+ZK2KOt/0BhPKW1KtqxKZEhZHsvRQcrIerfv MOYe2xU1GSrcIiH7N2upE0F412SX+eQ2ztzEAboVJBkFJjiyKJXJKVbIkNW5zmUyE+1C qEZLNa4PUx5aI1OhSnqhZuiJa2RxgVMpq/dcTFOyt4Ps0ldf1GCZjF/d6ihptNdZnOmK 7b66EPWszYSrGOPMu+0X/+uA1eCHQLnLPUeVoyvjvgXJ4D7BRRqn7X6Ce3QHJIamSDI6 PNlw== 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=2s0o2wptDgdU1RZ20vo/vyQzS4JpdfMk071h3j4mQfo=; b=Z3sqXZkom+WLN9r0TjRcSPbHCl6T6Tt9snfuISf+5TLKidQZLlR80nxoP0Vxo6aOgx yF3g4wsVLFhYnULjpUodpENu48jIlTbxG+gGbf2WYzyzFLE6b/QlOaSrW6EuAa5KRwhw isoyfmDTOxToNkuqzxVQRRN+Hf6e9HoazBupW8vSXVQ2YaJCNc1Z3GT+34oyja2w2Il3 uv5VybnQXctwUIz2trdT+f+MsEAeaIdo0cL7rXb39bsztkaz5grFHmnO4ezwzD9pr2xZ ojf++LSb0gwAFV63oZziZrlZxmb9xcQuQeOOkIBQmgO/CccyjHvHvJbC+Rzx8agOiaTt Jikg== X-Gm-Message-State: APjAAAVIvJi2Mg4QBtDrt/78NGsC5T6/hGfTR5j6LHlJRUHofiE0xxND fKAaYI1ULWSbS7hfRaODJHbRGyOcOwB8NeVaTDd4zw== X-Google-Smtp-Source: APXvYqyRpZNY8UmDVU/v8+MIYn+n34yz+4n6tPfZednK/MYGZlOTbgk55oq1DnL11+uiJA/lIhMUYeu5aFCpTwwVZRg= X-Received: by 2002:a24:605:: with SMTP id 5mr6223512itv.144.1553761304559; Thu, 28 Mar 2019 01:21:44 -0700 (PDT) MIME-Version: 1.0 References: <00000000000036e81e058507565b@google.com> In-Reply-To: From: Dmitry Vyukov Date: Thu, 28 Mar 2019 09:21:33 +0100 Message-ID: Subject: Re: INFO: rcu detected stall in __perf_sw_event To: Finn Thain Cc: syzbot , Arnaldo Carvalho de Melo , Alexander Shishkin , funaho@jurai.org, Geert Uytterhoeven , jolsa@redhat.com, LKML , linux-m68k@lists.linux-m68k.org, Ingo Molnar , Namhyung Kim , Peter Zijlstra , syzkaller-bugs Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 27, 2019 at 12:28 AM Finn Thain wrote: > > On Tue, 26 Mar 2019, syzbot wrote: > > > syzbot has bisected this bug to: > > > > commit cf85d89562f39cc7ae73de54639f1915a9195b7a > > Author: Finn Thain > > Date: Fri May 25 07:34:36 2018 +0000 > > > > m68k/mac: Enable PDMA for PowerBook 500 series > > > > Looks like a false positive. But if you really are running syzkaller on a > PowerBook 500, you'll want to check that you have an FPU, otherwise a CPU > erratum will probably mess up your results. Agree. I've included it into the big bisection analysis as "hard to reproduce" case: https://lkml.org/lkml/2019/3/27/788 > -- > > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1226cb8b200000 > > start commit: b0314565 Merge tag 'for_linus' of git://git.kernel.org/pub.. > > git tree: upstream > > final crash: https://syzkaller.appspot.com/x/report.txt?x=1126cb8b200000 > > console output: https://syzkaller.appspot.com/x/log.txt?x=1626cb8b200000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=8f00801d7b7c4fe6 > > dashboard link: https://syzkaller.appspot.com/bug?extid=a41ac89a0712acde0e84 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1707cd2f400000 > > > > Reported-by: syzbot+a41ac89a0712acde0e84@syzkaller.appspotmail.com > > Fixes: cf85d89562f3 ("m68k/mac: Enable PDMA for PowerBook 500 series") > > > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/alpine.LNX.2.21.1903271021290.994%40nippy.intranet. > For more options, visit https://groups.google.com/d/optout.