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=-0.4 required=3.0 tests=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 8C27CC4332D for ; Sun, 22 Mar 2020 03:31:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5EFA920637 for ; Sun, 22 Mar 2020 03:31:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728260AbgCVDbF (ORCPT ); Sat, 21 Mar 2020 23:31:05 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:55981 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727296AbgCVDbF (ORCPT ); Sat, 21 Mar 2020 23:31:05 -0400 Received: by mail-io1-f72.google.com with SMTP id k5so8310845ioa.22 for ; Sat, 21 Mar 2020 20:31:04 -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=8nZWcNO+DrxQ4s8b90bUZeMFLENWFuwrxp+C1YlPnOE=; b=VEapehTBj0Ctcnh0FTulfJaPBTZMrAiEg6/e+EOXtcLQcG6zIR1BqAqjYbBjppytTw o8tEswQnmp6AZbQ3/no+etVcsh5izBB3kUAqRQx1HkR/UL5xGZAoJuJY3egdVGB3F5GM fm36qKMEe21tksQ5D7qgfqf+lNCt2bnn6WFfJPmsJlVuV9h7uVIPjJ3SuFO+Sb++76OU Cgo4x09jEbsdaxPhleLK2gbW3V91Z5U+/VPoWvW/MRQG361ih+i9kaxAhUPD8tlwcQ3A 6a6AhUgZrCZITk4UTlGVCYPn7pmVVoTz3n8+b09C7LXP23Ve8fTiZh8LZqCovXbFyT0c 1RVg== X-Gm-Message-State: ANhLgQ0CeNnOhpKhrVCjsdey3LO2KtVP6IGiqr4pIwxTs6aQ5BXvf6yo ZcvRQoeEHJ0ILRETYSBCXWNKRPFSwj5n0YtXyI7ls13QIbxQ X-Google-Smtp-Source: ADFU+vu238tJAeWox3dcwhThsCAlmUdZYHUcZI17D3Ju1wPlJpIWrvO0GOq2JFMVs0LzLmjvnsgF4PcQN2ntWGBx/+nbM9k09DIq MIME-Version: 1.0 X-Received: by 2002:a02:b701:: with SMTP id g1mr8752742jam.92.1584847864144; Sat, 21 Mar 2020 20:31:04 -0700 (PDT) Date: Sat, 21 Mar 2020 20:31:04 -0700 In-Reply-To: <000000000000f965b8059877e5e6@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f725a005a1692508@google.com> Subject: Re: WARNING in vcpu_enter_guest From: syzbot To: bp@alien8.de, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kvm@vger.kernel.org, linmiaohe@huawei.com, linux-kernel@vger.kernel.org, mingo@redhat.com, pbonzini@redhat.com, rkrcmar@redhat.com, sean.j.christopherson@intel.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org 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 bug to: commit 9446e6fce0ab9dfd44b96f630b4e3a0a0ab879fd Author: Paolo Bonzini Date: Wed Feb 12 12:27:10 2020 +0000 KVM: x86: fix WARN_ON check of an unsigned less than zero bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1744891de00000 start commit: 5076190d mm: slub: be more careful about the double cmpxch.. git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=14c4891de00000 console output: https://syzkaller.appspot.com/x/log.txt?x=10c4891de00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9f894bd92023de02 dashboard link: https://syzkaller.appspot.com/bug?extid=00be5da1d75f1cc95f6b syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10bb4023e00000 Reported-by: syzbot+00be5da1d75f1cc95f6b@syzkaller.appspotmail.com Fixes: 9446e6fce0ab ("KVM: x86: fix WARN_ON check of an unsigned less than zero") For information about bisection process see: https://goo.gl/tpsmEJ#bisection