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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Mon, 20 Nov 2017 13:06:33 +0100
Message-ID: <CACT4Y+YtgtYXoOF3p+mOZdKYHXDgakaczgK_kFF7H0UCioP6dg@mail.gmail.com>
Subject: Re: WARNING in kvm_arch_vcpu_ioctl_run (2)
To:     Wanpeng Li <kernellwp@gmail.com>
Cc:     "H. Peter Anvin" <hpa@zytor.com>,
        syzbot 
        <bot+d9fbc5c299aa8a95ac07572b4f6e191c0f4efff6@syzkaller.appspotmail.com>,
        kvm <kvm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Radim Krcmar <rkrcmar@redhat.com>,
        syzkaller-bugs@googlegroups.com,
        Thomas Gleixner <tglx@linutronix.de>,
        "the arch/x86 maintainers" <x86@kernel.org>
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On Mon, Nov 20, 2017 at 10:23 AM, Dmitry Vyukov <dvyukov@google.com> wrote:
> On Mon, Nov 20, 2017 at 10:19 AM, Wanpeng Li <kernellwp@gmail.com> wrote:
>> Hi Dmitry,
>> 2017-11-20 12:09 GMT+08:00 Wanpeng Li <kernellwp@gmail.com>:
>>> 2017-11-18 4:22 GMT+08:00 syzbot
>>> <bot+d9fbc5c299aa8a95ac07572b4f6e191c0f4efff6@syzkaller.appspotmail.com>:
>>>> Hello,
>>>>
>>>> syzbot has tested the proposed patch but the reproducer still triggered
>>>> crash:
>>>> WARNING in kvm_arch_vcpu_ioctl_run
>>>>
>>>> VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
>>>>         reason=80000021 qualification=0000000000000000
>>>> IDTVectoring: info=00000000 errcode=00000000
>>>> TSC Offset = 0xffffffeeb46bc6ac
>>>> EPT pointer = 0x00000001ce37601e
>>>> WARNING: CPU: 0 PID: 3023 at arch/x86/kvm/x86.c:7293
>>>> kvm_arch_vcpu_ioctl_run+0x213/0x5d20
>>>> Kernel panic - not syncing: panic_on_warn set ...
>>>>
>>>> CPU: 0 PID: 3023 Comm: syz-executor4 Not tainted 4.14.0-next-20171117+ #9
>>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>>>> Google 01/01/2011
>>>> Call Trace:
>>>>  dump_stack+0x173/0x237
>>>>  panic+0x1e4/0x41c
>>>>  __warn+0x1d9/0x1f0
>>>>  report_bug+0x20a/0x2d0
>>>>  fixup_bug.part.10+0x32/0x80
>>>>  do_error_trap+0x29c/0x370
>>>>  invalid_op+0x18/0x20
>>>> RIP: 0010:kvm_arch_vcpu_ioctl_run+0x213/0x5d20
>>>> RSP: 0018:ffff8801ce197680 EFLAGS: 00010293
>>>> RAX: ffff8801ce588440 RBX: ffff8801d5b8f000 RCX: ffffffff810d4003
>>>> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801ce0e02b8
>>>> RBP: ffff8801ce197a50 R08: 0000000000000001 R09: 0000000000000001
>>>> R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
>>>> R13: ffff8801ce0e0168 R14: ffff8801cec10980 R15: ffff8801ce0e0080
>>>>  kvm_vcpu_ioctl+0x619/0xf80
>>>>  do_vfs_ioctl+0x18b/0x13e0
>>>>  SyS_ioctl+0x7e/0xb0
>>>>  entry_SYSCALL_64_fastpath+0x1f/0x96
>>>> RIP: 0033:0x452879
>>>> RSP: 002b:00007f4bc97fdbe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
>>>> RAX: ffffffffffffffda RBX: 0000000000000082 RCX: 0000000000452879
>>>> RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000004
>>>> RBP: 00007ffce1993510 R08: 0000000000000000 R09: 0000000000000000
>>>> R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
>>>> R13: 00007ffce199348f R14: 00007f4bc97fe9c0 R15: 0000000000000006
>>>> Dumping ftrace buffer:
>>>>    (ftrace buffer empty)
>>>> Kernel Offset: disabled
>>>> Rebooting in 86400 seconds..
>>>
>>> I will have a look.
>>
>> Please have a try. https://lkml.org/lkml/2017/11/20/118
>
> Hi Wanpeng,
>
> There is shiny new feature being rolled for syzbot, see "#syz test" here:
>
> https://github.com/google/syzkaller/blob/master/docs/syzbot.md#communication-with-syzbot
>
> Please have a try ;)


Bringing some of offline discussion online. We are unable to test
patches for hundreds of bugs reported across branches/releases/OSes
and want to automate most of the process.
Let's give it a try still:

#syz test: git://git.kernel.org/pub/scm/virt/kvm/kvm.git next

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