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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 D0FC9C76196 for ; Fri, 19 Jul 2019 16:34:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B038221872 for ; Fri, 19 Jul 2019 16:34:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731145AbfGSQeB (ORCPT ); Fri, 19 Jul 2019 12:34:01 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:47956 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727577AbfGSQeB (ORCPT ); Fri, 19 Jul 2019 12:34:01 -0400 Received: by mail-io1-f71.google.com with SMTP id r27so35150097iob.14 for ; Fri, 19 Jul 2019 09:34:00 -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=K0tO5uO221nvtR7gnlqeSa9IqFZGmt58DDiOBmYEiu8=; b=r7zwFcIl0QxlJF5FdwWxa8IOGB4+FlblTKSlZ+9LR2CTkYLrekxXG1EwO22mdY88J+ l2KLPZtDd9HNXliKSf95uMSCUnhi1+k4rokUA998pXEXW/yzK09bdqKgcnCUyf//xCuS WF/SsGrH6Iq9dE2rInuJtGFFZXweoFWmmmNB2fpfPw+aQGMqyTReRlkDDktnGTGAot8M 6s/S/6mFd99rQsTGvywL791gpmjipw/Tlph12CRhnLLOofKfqNS0YTLqSj6efKsiS5JK hH4kV8Dc/dZ1xoWfTP14NjM83JeMrdP1phI+NE54ZDm0QfWvjIxJwBuP8oCwGHDyGoAg mbSA== X-Gm-Message-State: APjAAAWgWxPGBcbV0waHH7iptC5GKnjDqtjGy2FzeJlPqNXupKIoUFLs c6PYJ5FNXU2LlQhhwmKfKJoC2fP0UvDnv3IrwQRt7NkOv+17 X-Google-Smtp-Source: APXvYqzXnjpSQV9iFQbyh8yurehonYeDVnnn919X9PLqsJYbWXJy2VpoCVH3ZDalQ76trhEOtpL1aMd4nm27xBBAS+sOD1mk8YpL MIME-Version: 1.0 X-Received: by 2002:a5d:8c87:: with SMTP id g7mr47222471ion.85.1563554040200; Fri, 19 Jul 2019 09:34:00 -0700 (PDT) Date: Fri, 19 Jul 2019 09:34:00 -0700 In-Reply-To: <000000000000490679058e0245ee@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000027494e058e0b4b3f@google.com> Subject: Re: KASAN: use-after-free Read in finish_task_switch (2) From: syzbot To: aarcange@redhat.com, akpm@linux-foundation.org, christian@brauner.io, davem@davemloft.net, ebiederm@xmission.com, elena.reshetova@intel.com, guro@fb.com, hch@infradead.org, james.bottomley@hansenpartnership.com, jasowang@redhat.com, jglisse@redhat.com, keescook@chromium.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-parisc@vger.kernel.org, luto@amacapital.net, mhocko@suse.com, mingo@kernel.org, mst@redhat.com, namit@vmware.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, wad@chromium.org, yuehaibing@huawei.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has bisected this bug to: commit 7f466032dc9e5a61217f22ea34b2df932786bbfc Author: Jason Wang Date: Fri May 24 08:12:18 2019 +0000 vhost: access vq metadata through kernel virtual address bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=123faf70600000 start commit: 22051d9c Merge tag 'platform-drivers-x86-v5.3-2' of git://.. git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=113faf70600000 console output: https://syzkaller.appspot.com/x/log.txt?x=163faf70600000 kernel config: https://syzkaller.appspot.com/x/.config?x=135cb826ac59d7fc dashboard link: https://syzkaller.appspot.com/bug?extid=7f067c796eee2acbc57a syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c1898fa00000 Reported-by: syzbot+7f067c796eee2acbc57a@syzkaller.appspotmail.com Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual address") For information about bisection process see: https://goo.gl/tpsmEJ#bisection