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=-4.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 9C86DC433E1 for ; Fri, 17 Jul 2020 22:40:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8213B20775 for ; Fri, 17 Jul 2020 22:40:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727095AbgGQWkF (ORCPT ); Fri, 17 Jul 2020 18:40:05 -0400 Received: from mail-il1-f198.google.com ([209.85.166.198]:51194 "EHLO mail-il1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726947AbgGQWkF (ORCPT ); Fri, 17 Jul 2020 18:40:05 -0400 Received: by mail-il1-f198.google.com with SMTP id l17so6330358ilj.17 for ; Fri, 17 Jul 2020 15:40:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=bZyN/zZkAna3AuJV7mJCywjPBma23V/L6XGmPytQX3g=; b=ufSF/DEoadiFJmRuAGKQgEbTwBNj0V1AT7bUamaiCLFdGMBLW+M1rIR8/CZ9JAekp2 jlmxnzvSXktYRlNPyxMsae4R0+kI/U1XRj1Z2ci/HR8pmON3HdgEJz8eo+7z96EnfWU7 MTsnJ2WJ3euzyDwoeMqVVZO5TjU3dT6IC/MLLlM67em/+w5lzHV73fku6Y4PXXlhFPwn IkUovySBRLVMRjP+fhDLvCdJiJ99VZhY2JZ2o7Vys3Kknq9lLba2IdIgsyShqe3Bm2hz WwtGorqxyWGZom6F7lycunGnG3kBfOERBHpGfAQnzIi7YroGHFLxqVGlqspnuSUMZAS0 1oIA== X-Gm-Message-State: AOAM53213ndztrCcqsnP5KrtaffESKU6q+5UuBCOkXeRSY4XXgfXufko gtWDLlltAxXmM6IC/wgZm0MbuNWUR9cAeRaTt4NXoLDjvAQY X-Google-Smtp-Source: ABdhPJxLi7/gPDf4MlcBV9h1ItF5n6fCkgiWG0/+rbnSHUtonUG5WWXjJHmQs62JK8/EaZk4B+A2cmhJTAcbiYpEg6/zYnrU6Ale MIME-Version: 1.0 X-Received: by 2002:a05:6638:dcf:: with SMTP id m15mr13454918jaj.86.1595025604135; Fri, 17 Jul 2020 15:40:04 -0700 (PDT) Date: Fri, 17 Jul 2020 15:40:04 -0700 In-Reply-To: <000000000000358aec05a9fc8aa8@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008ad07505aaaad631@google.com> Subject: Re: general protection fault in khugepaged From: syzbot To: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, torvalds@linux-foundation.org, william.kucharski@oracle.com, yang.shi@linux.alibaba.com, ziy@nvidia.com 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 syzbot has bisected this issue to: commit ffe945e633b527d5a4577b42cbadec3c7cbcf096 Author: Kirill A. Shutemov Date: Wed Jun 3 23:00:09 2020 +0000 khugepaged: do not stop collapse if less than half PTEs are referenced bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17356c2f100000 start commit: e44f65fd xen-netfront: remove redundant assignment to vari.. git tree: net-next final oops: https://syzkaller.appspot.com/x/report.txt?x=14b56c2f100000 console output: https://syzkaller.appspot.com/x/log.txt?x=10b56c2f100000 kernel config: https://syzkaller.appspot.com/x/.config?x=829871134ca5e230 dashboard link: https://syzkaller.appspot.com/bug?extid=ed318e8b790ca72c5ad0 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=113406a7100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=175597d3100000 Reported-by: syzbot+ed318e8b790ca72c5ad0@syzkaller.appspotmail.com Fixes: ffe945e633b5 ("khugepaged: do not stop collapse if less than half PTEs are referenced") For information about bisection process see: https://goo.gl/tpsmEJ#bisection