Received: by 2002:ac0:bc90:0:0:0:0:0 with SMTP id a16csp4756076img; Tue, 26 Mar 2019 16:30:27 -0700 (PDT) X-Google-Smtp-Source: APXvYqxjmYXNNYvgZgrcvIivbF5CO+6fgNZZYXiklwpaeW4Mv8CVRJZXvCHqg8qv0/n5DorQylZv X-Received: by 2002:a65:6548:: with SMTP id a8mr2955839pgw.442.1553643027027; Tue, 26 Mar 2019 16:30:27 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1553643027; cv=none; d=google.com; s=arc-20160816; b=MGzxygWHmsu8saWPGo6FeNzIWhRkpkQCCTECml0AUbi6mhCXYNZHRq4C8v4skpXVUD /8QmT/skYynwAteZdri4AWepVxlT4rMhtjOQ42i8HwBPJIZ+DbNgSuRXKKq55E5WdQjh ecNkE0aJRaTsvzzTHjZ6GxBQiFEXuW8i1hMGEAeImXSWkKjS4Zy5c9HF8SiIsBYUiQCP UktlkqbjHytWs8PUvmKXy+ik6n/BPVcqJEGSUaV8QhfWc0YKwLhLVdcWCVIe/91bPIld xqyL49zjaohFomkV8L5Z15DUgtf8RsAt+nFLaM1WFAk6BEbVGRt55fjIVXgmLx0B974h YGrw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:references:message-id :in-reply-to:subject:cc:to:from:date; bh=+faA1mHh1puJyuXozfzlskK6sVc0zckae7ChxU7ae0g=; b=LpLfFjK0p/Law6wnCWGITV3Q7FHIHyJolqkjGMN8BDuPkkPGUwNYaR5V86w++sCaaY n7aJZzCW0u7w+wb5U/YUci0AbjRKty17A45apeG+I38LIQetdXzvvTr8vtAgQSScdLtZ Pp373LXHbw+hWEhGFyKYs7Ka8uDabePDfyitjyF9F/SgcLfhzvsJkRv74UmnyIlbsVTC TVs4ZRruswY0itG+YRdOWVPRnNtfLvQhzGfaCjmpbOZbP0OnU4dmGT2fjDgTu/PGqbpK IWnN2nf+zeEs8FEwqywqMOV5FTcYBU9kAxesjIDyWeAnYByFgHkzE9NTcGlObBkqCXas xGbg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id w13si17083653pgj.177.2019.03.26.16.30.11; Tue, 26 Mar 2019 16:30:27 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732472AbfCZX2W (ORCPT + 99 others); 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