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 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 AB1ECC4332D for ; Thu, 19 Mar 2020 10:35:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8825920722 for ; Thu, 19 Mar 2020 10:35:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727108AbgCSKfR (ORCPT ); Thu, 19 Mar 2020 06:35:17 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:37496 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726663AbgCSKfQ (ORCPT ); Thu, 19 Mar 2020 06:35:16 -0400 Received: by mail-io1-f72.google.com with SMTP id p4so1345411ioo.4 for ; Thu, 19 Mar 2020 03:35:16 -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=75IFSF+U0YhTbbRGzRYltGi5QkhePC6VgWPG6wybEig=; b=DoEIvIt3wVPe8O3Fckc/Edh7UUZGR4TvdwdYMIG4viakEtoHi5gveKN5B3LTTg7G22 LngmiqE+M53XBvubezINwZRp6ftVRFov0xeHcdAJxej70z8M/23lKzpTLZJbmmC8rc9p oFi307BQZt51Zh5U6jiBNo8oHLTp6bKMGFIkJJjhdDkT5xxDqtcJHqfLNt+kI8FHBHSh O4KAKhLsCoBYuN3/LSv+/nj2paKexL3DAXc54hArFfMmkisMEhpYh1ee93+GuNTFxHqr oQeNOfLHVapvIyclnYbdiSp5Mpa28weSaeNpZQwAE54mTednnCbjzMZSaaK4NxQ8ExO5 I58w== X-Gm-Message-State: ANhLgQ2/1nTBEzrvdMZuFqoa5pRkSgsQwKF8j0L3cEokwxSrMg8QvV4u VcGr3AojBMv8kWXL7K1AGLcyROTyVQfLiLkNES0LbIbfP/ZS X-Google-Smtp-Source: ADFU+vsdroRqSLGN56Cc3Nn2W+BmUiajwugkafWJeacGc4vIpO1oUXD2MhjHgSjlm5KXkDc//S5OUmRIgWgxDpDverVTVgn3ZG4F MIME-Version: 1.0 X-Received: by 2002:a92:dad0:: with SMTP id o16mr2312812ilq.27.1584614116260; Thu, 19 Mar 2020 03:35:16 -0700 (PDT) Date: Thu, 19 Mar 2020 03:35:16 -0700 In-Reply-To: <000000000000f965b8059877e5e6@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000081861f05a132b9cd@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, 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 found a reproducer for the following crash on: HEAD commit: 5076190d mm: slub: be more careful about the double cmpxch.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=143ca61de00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9f894bd92023de02 dashboard link: https://syzkaller.appspot.com/bug?extid=00be5da1d75f1cc95f6b compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10bb4023e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+00be5da1d75f1cc95f6b@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 9833 at arch/x86/kvm/x86.c:2447 kvm_guest_time_update arch/x86/kvm/x86.c:2447 [inline] WARNING: CPU: 0 PID: 9833 at arch/x86/kvm/x86.c:2447 vcpu_enter_guest+0x3cf3/0x6120 arch/x86/kvm/x86.c:8175 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9833 Comm: syz-executor.0 Not tainted 5.6.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x27b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:kvm_guest_time_update arch/x86/kvm/x86.c:2447 [inline] RIP: 0010:vcpu_enter_guest+0x3cf3/0x6120 arch/x86/kvm/x86.c:8175 Code: f3 7e 0f 94 c3 31 ff 89 de e8 d9 03 64 00 84 db 0f 84 62 ea ff ff e8 9c 02 64 00 e8 fb 43 f2 ff e9 53 ea ff ff e8 8d 02 64 00 <0f> 0b e9 e7 dc ff ff e8 81 02 64 00 bf 00 94 35 77 45 31 e4 4c 69 RSP: 0018:ffffc900024afb50 EFLAGS: 00010293 RAX: ffff888097b88040 RBX: fffffffffffff8d2 RCX: ffffffff810dff78 RDX: 0000000000000000 RSI: ffffffff810e2293 RDI: 0000000000000007 RBP: ffffc900024afcc0 R08: ffff888097b88040 R09: fffffbfff180e58f R10: fffffbfff180e58e R11: ffffffff8c072c77 R12: 0000000000000000 R13: ffffc90002521000 R14: ffff88808e620378 R15: ffff88808e620340 vcpu_run arch/x86/kvm/x86.c:8513 [inline] kvm_arch_vcpu_ioctl_run+0x41c/0x1790 arch/x86/kvm/x86.c:8735 kvm_vcpu_ioctl+0x493/0xe60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2932 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5029f2ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5029f2f6d4 RCX: 000000000045c849 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003be R14: 00000000004c647e R15: 000000000076bf0c Kernel Offset: disabled Rebooting in 86400 seconds..