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From:   Wanpeng Li <kernellwp@gmail.com>
Date:   Mon, 20 Nov 2017 12:09:16 +0800
Message-ID: <CANRm+CwOti9F4Fitr5TvX+ji8s807n_kGXe_p=SPe5tp27=3mw@mail.gmail.com>
Subject: Re: WARNING in kvm_arch_vcpu_ioctl_run (2)
To:     syzbot 
        <bot+d9fbc5c299aa8a95ac07572b4f6e191c0f4efff6@syzkaller.appspotmail.com>
Cc:     Dmitry Vyukov <dvyukov@google.com>,
        "H. Peter Anvin" <hpa@zytor.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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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.

Regards,
Wanpeng Li

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