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=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,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 297DAC43381 for ; Tue, 26 Mar 2019 23:28:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E71F120811 for ; Tue, 26 Mar 2019 23:28:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732799AbfCZX2W (ORCPT ); Tue, 26 Mar 2019 19:28:22 -0400 Received: from kvm5.telegraphics.com.au ([98.124.60.144]:53538 "EHLO kvm5.telegraphics.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731619AbfCZX2W (ORCPT ); Tue, 26 Mar 2019 19:28:22 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by kvm5.telegraphics.com.au (Postfix) with ESMTP id 05E5D22BFC; Tue, 26 Mar 2019 19:28:16 -0400 (EDT) Date: Wed, 27 Mar 2019 10:28:19 +1100 (AEDT) From: Finn Thain To: syzbot cc: acme@kernel.org, alexander.shishkin@linux.intel.com, funaho@jurai.org, geert@linux-m68k.org, jolsa@redhat.com, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com Subject: Re: INFO: rcu detected stall in __perf_sw_event In-Reply-To: <00000000000036e81e058507565b@google.com> Message-ID: References: <00000000000036e81e058507565b@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. -- > 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