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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 64685C432C3 for ; Thu, 21 Nov 2019 18:01:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2673C2068F for ; Thu, 21 Nov 2019 18:01:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="PWALfx7L" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2673C2068F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AAEF26B0367; Thu, 21 Nov 2019 13:01:40 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A5F796B0368; Thu, 21 Nov 2019 13:01:40 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 974CC6B0369; Thu, 21 Nov 2019 13:01:40 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0063.hostedemail.com [216.40.44.63]) by kanga.kvack.org (Postfix) with ESMTP id 80F376B0367 for ; Thu, 21 Nov 2019 13:01:40 -0500 (EST) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 0F1FE181AEF21 for ; Thu, 21 Nov 2019 18:01:40 +0000 (UTC) X-FDA: 76181052360.05.crush55_2b8c93b84451d X-HE-Tag: crush55_2b8c93b84451d X-Filterd-Recvd-Size: 4091 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf24.hostedemail.com (Postfix) with ESMTP for ; Thu, 21 Nov 2019 18:01:39 +0000 (UTC) Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EBA2D206DA for ; Thu, 21 Nov 2019 18:01:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574359298; bh=ruTBz8dVya4WaPnyIBDp61iWLDaJrk1pYALVmqj+7Vo=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=PWALfx7LQ2JlDN3r79NlzOh4KVooG+VZ0qnOW5HSzGcU3OI82ZYUQQZgkZg5u/6ry uPbLkk4X059DMbaxwZBM9BLnS1yPPb7VuAGdgYIxp8i+v9zqfZKc63bilGPdYewpuL TE6x1Q3LzqclMIsuYHM99hKheZOcuIHCGsKFidjY= Received: by mail-wm1-f42.google.com with SMTP id y5so4764971wmi.5 for ; Thu, 21 Nov 2019 10:01:37 -0800 (PST) X-Gm-Message-State: APjAAAXLvp5RADyQCBYFOYkMq7NEici3RyUv2+0Kc/IudrZqj5zBWVHV ElXkrtEmV1v+8R60PeFblKqhGxIE/rf1Si93omKFKQ== X-Google-Smtp-Source: APXvYqzhHzqk5yF6OIonrsRfxSV2BGF3FMJRz7HvRWn1XUIvwVYdsgWd8lNDLFm13XUwgW2XCgZQRtVGKYKAEXK8YeM= X-Received: by 2002:a7b:c1ca:: with SMTP id a10mr12336041wmj.161.1574359296389; Thu, 21 Nov 2019 10:01:36 -0800 (PST) MIME-Version: 1.0 References: <0000000000006e31980579315914@google.com> <000000000000a6993c0597cc8375@google.com> In-Reply-To: <000000000000a6993c0597cc8375@google.com> From: Andy Lutomirski Date: Thu, 21 Nov 2019 10:01:24 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: INFO: task hung in __do_page_fault (2) To: syzbot Cc: Arnaldo Carvalho de Melo , Andrew Morton , Arnd Bergmann , Jonathan Corbet , "Eric W. Biederman" , Kees Cook , "open list:DOCUMENTATION" , LKML , Linux-MM , Dominik Brodowski , Andrew Lutomirski , "Luis R. Rodriguez" , Ingo Molnar , Peter Zijlstra , Sudip Mukherjee , syzkaller-bugs@googlegroups.com, Linus Torvalds Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Nov 20, 2019 at 11:52 AM syzbot wrote: > > syzbot has bisected this bug to: > > commit 0161028b7c8aebef64194d3d73e43bc3b53b5c66 > Author: Andy Lutomirski > Date: Mon May 9 22:48:51 2016 +0000 > > perf/core: Change the default paranoia level to 2 > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15910e86e00000 > start commit: 18d0eae3 Merge tag 'char-misc-4.20-rc1' of git://git.kerne.. > git tree: upstream > final crash: https://syzkaller.appspot.com/x/report.txt?x=17910e86e00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=13910e86e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=342f43de913c81b9 > dashboard link: https://syzkaller.appspot.com/bug?extid=6b074f741adbd93d2df5 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12482713400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=158fd4a3400000 > > Reported-by: syzbot+6b074f741adbd93d2df5@syzkaller.appspotmail.com > Fixes: 0161028b7c8a ("perf/core: Change the default paranoia level to 2") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection Hi syzbot- I'm not quite sure how to tell you this in syzbotese, but I'm pretty sure you've bisected this wrong. The blamed patch makes no sense. --Andy