linux-kernel - Re: WARNING in x86_emulate

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Message-ID: <CACT4Y+YBpFyEDSnfWD3XX249Bkk73SZDBWhqBJH8Oxqph88u1Q@mail.gmail.com>
Date:   Thu, 7 Dec 2017 07:25:06 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     syzbot 
        <bot+75375385991b4f8c599704a10849863c586ea284@...kaller.appspotmail.com>,
        "H. Peter Anvin" <hpa@...or.com>, kvm <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        syzkaller-bugs@...glegroups.com,
        Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: WARNING in x86_emulate_insn

On Thu, Dec 7, 2017 at 1:44 AM, Wanpeng Li <kernellwp@...il.com> wrote:
> 2017-12-06 4:07 GMT+08:00 syzbot
> <bot+75375385991b4f8c599704a10849863c586ea284@...kaller.appspotmail.com>:
>> Hello,
>>
>> syzkaller hit the following crash on
>> fb20eb9d798d2f4c1a75b7fe981d72dfa8d7270d
>> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached
>> Raw console output is attached.
>>
>> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>> for information about syzkaller reproducers
>>
>
> Is there a c program to reproduce?

No, syzbot does not hide reproducers. See the referenced doc for
details: https://github.com/google/syzkaller/blob/master/docs/syzbot.md#syzkaller-reproducers


> Regards,
> Wanpeng Li
>
>>
>> kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu
>> WARNING: CPU: 1 PID: 3526 at arch/x86/kvm/emulate.c:5654
>> x86_emulate_insn+0xd01/0x3cf0 arch/x86/kvm/emulate.c:5654
>> Kernel panic - not syncing: panic_on_warn set ...
>>
>> CPU: 1 PID: 3526 Comm: syz-executor4 Not tainted 4.15.0-rc1-next-20171201+
>> #57
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>>  __dump_stack lib/dump_stack.c:17 [inline]
>>  dump_stack+0x194/0x257 lib/dump_stack.c:53
>>  panic+0x1e4/0x41c kernel/panic.c:183
>>  __warn+0x1dc/0x200 kernel/panic.c:547
>>  report_bug+0x211/0x2d0 lib/bug.c:184
>>  fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:177
>>  fixup_bug arch/x86/kernel/traps.c:246 [inline]
>>  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295
>>  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
>>  invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1066
>> RIP: 0010:x86_emulate_insn+0xd01/0x3cf0 arch/x86/kvm/emulate.c:5654
>> RSP: 0018:ffff8801d0fff3e8 EFLAGS: 00010293
>> RAX: ffff8801d17b60c0 RBX: 1ffff1003a1ffe86 RCX: ffffffff81154351
>> RDX: 0000000000000000 RSI: ffffffffffffffff RDI: ffff8801d0b5b5c8
>> RBP: ffff8801d0fff4f8 R08: ffff8801d0b58d80 R09: ffffffff85224da0
>> R10: 0000000000000001 R11: ffffed003a16b6d4 R12: 00000000000000ff
>> R13: ffff8801d0b5b5a0 R14: 0000000000000002 R15: ffff8801d0b5b6c3
>>  x86_emulate_instruction+0x411/0x1ad0 arch/x86/kvm/x86.c:5771
>>  emulate_instruction arch/x86/include/asm/kvm_host.h:1164 [inline]
>>  complete_emulated_io arch/x86/kvm/x86.c:7190 [inline]
>>  complete_emulated_pio+0xdd/0x1b0 arch/x86/kvm/x86.c:7201
>>  kvm_arch_vcpu_ioctl_run+0x2db2/0x5c60 arch/x86/kvm/x86.c:7305
>>  kvm_vcpu_ioctl+0x64c/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2574
>>  vfs_ioctl fs/ioctl.c:46 [inline]
>>  do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
>>  SYSC_ioctl fs/ioctl.c:701 [inline]
>>  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
>>  entry_SYSCALL_64_fastpath+0x1f/0x96
>> RIP: 0033:0x4529d9
>> RSP: 002b:00007f6b6b2d5c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
>> RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
>> RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000004
>> RBP: 000000000000039b R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2728
>> R13: 00000000ffffffff R14: 00007f6b6b2d66d4 R15: 0000000000000000
>> Dumping ftrace buffer:
>>    (ftrace buffer empty)
>> Kernel Offset: disabled
>> Rebooting in 86400 seconds..
>>
>>
>> ---
>> This bug is generated by a dumb bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for details.
>> Direct all questions to syzkaller@...glegroups.com.
>> Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>
>>
>> syzbot will keep track of this bug report.
>> Once a fix for this bug is committed, please reply to this email with:
>> #syz fix: exact-commit-title
>> If you want to test a patch for this bug, please reply with:
>> #syz test: git://repo/address.git branch
>> and provide the patch inline or as an attachment.
>> To mark this as a duplicate of another syzbot report, please reply with:
>> #syz dup: exact-subject-of-another-report
>> If it's a one-off invalid bug report, please reply with:
>> #syz invalid
>> Note: if the crash happens again, it will cause creation of a new bug
>> report.
>> Note: all commands must start from beginning of the line in the email body.
>
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