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=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 BCD9FC43215 for ; Thu, 21 Nov 2019 18:01:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 90DFD20672 for ; Thu, 21 Nov 2019 18:01:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574359300; bh=ruTBz8dVya4WaPnyIBDp61iWLDaJrk1pYALVmqj+7Vo=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=jdSfben6MNm39YwbAOc6gRBGgK7RYkKBIRGHeT5YUT2/lFZTrpAxiK8Sr8cjjqnel t3u3eGXO/e7ZE/liZq8daDwaj8LJODQPELDhr4lnRxGxYwFANtLD04akHtfM0kTpP+ SZr4+bd6gUkm3DTcQC6P59ahKqZXy1YRKsayiiE4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727028AbfKUSBj (ORCPT ); Thu, 21 Nov 2019 13:01:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:47306 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726333AbfKUSBj (ORCPT ); Thu, 21 Nov 2019 13:01:39 -0500 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (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 F193D206F4 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-f44.google.com with SMTP id t26so4380428wmi.0 for ; Thu, 21 Nov 2019 10:01:37 -0800 (PST) X-Gm-Message-State: APjAAAWG3pb9X3D9bMKxytneGluThyRbYGAboBnFTYJHXAUpkeJsj3Gv PIVtoByt7i/47VxtM1wD6l62iaStocbU2NaRpstViw== 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" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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