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 A03A3C433E4 for ; Fri, 17 Jul 2020 22:40:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4F97A20739 for ; Fri, 17 Jul 2020 22:40:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4F97A20739 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B965D8D001C; Fri, 17 Jul 2020 18:40:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B20678D0003; Fri, 17 Jul 2020 18:40:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9C2FF8D001C; Fri, 17 Jul 2020 18:40:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0060.hostedemail.com [216.40.44.60]) by kanga.kvack.org (Postfix) with ESMTP id 82DBC8D0003 for ; Fri, 17 Jul 2020 18:40:05 -0400 (EDT) Received: from smtpin14.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 41E838248047 for ; Fri, 17 Jul 2020 22:40:05 +0000 (UTC) X-FDA: 77049037170.14.star58_130ab1e26f0e Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin14.hostedemail.com (Postfix) with ESMTP id 156AE18021E9C for ; Fri, 17 Jul 2020 22:40:05 +0000 (UTC) X-HE-Tag: star58_130ab1e26f0e X-Filterd-Recvd-Size: 3238 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by imf41.hostedemail.com (Postfix) with ESMTP for ; Fri, 17 Jul 2020 22:40:04 +0000 (UTC) Received: by mail-io1-f71.google.com with SMTP id i204so7439157ioa.2 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=tRcbRvt+q10XTs9uN4OF7IQd9h/92evQw/IAk1LDKbh0TKY+2OWKxtmJwUnXQl0SYm uwI3u24+ik1w8xYoDMHC4OORcoToReaF1B4PHr9rcjJOjXAQaLCt/i2eE3dtJQkzQZYe wzEOtqZKymyTsfzP6/htZ+Yqa4Sz8W5Cj/W49IhaCAfiuURD9QUJYZO8mw5OZeHJvAKx +okI49M74fLkAsTF75UoS51Uh6IF96N+yHrDK4FS9qj22ZNXdiryfOCDtAZRHJjA+WcE t6Vk8Wr+a6XxZkvTqVpDoOmNbFRqneUsqycIUkvkWdpCJ7OWMkkNEfZ/7nOAGwvdUExR mu8w== X-Gm-Message-State: AOAM5307kec/lUtOm6fuiMgSo1YdOpDzYGMoQqE5/onEohtS5Rlre5aP iY8U6mg5z4FUeaWmDdGR4QZcxVs5e/QsBvF4UYLeFav+lhAD 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" X-Rspamd-Queue-Id: 156AE18021E9C X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.113726, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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