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Date:   Wed, 20 Dec 2017 15:54:13 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     syzbot 
        <bot+ab09454bf4b7a7f8ce7e5e8d97e644d3314a0799@...kaller.appspotmail.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, kvm <kvm@...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: general protection fault in native_write_cr4

2017-12-20 15:49 GMT+08:00 syzbot
<bot+ab09454bf4b7a7f8ce7e5e8d97e644d3314a0799@...kaller.appspotmail.com>:
> Hello,
>
> syzkaller hit the following crash on
> f6f3732162b5ae3c771b9285a5a32d72b8586920
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>

I will have a look again, you continue to run it in kvm guest, right?

Regards,
Wanpeng Li

> kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] SMP KASAN
> Dumping ftrace buffer:
>    (ftrace buffer empty)
> Modules linked in:
> CPU: 1 PID: 3142 Comm: syzkaller429302 Not tainted 4.15.0-rc3+ #224
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76
> RSP: 0018:ffff8801ca6f75a0 EFLAGS: 00010093
> RAX: ffff8801ca1c8700 RBX: 00000000001606e0 RCX: ffffffff811a2a92
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606e0
> RBP: ffff8801ca6f75a0 R08: 1ffff100394dee0f R09: 0000000000000004
> R10: ffff8801ca6f7510 R11: 0000000000000004 R12: 0000000000000093
> R13: ffff8801ca1c8700 R14: ffff8801db514850 R15: ffff8801db514850
> FS:  0000000001031880(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 0000000005e22006 CR4: 00000000001626e0
> Call Trace:
>  __write_cr4 arch/x86/include/asm/paravirt.h:76 [inline]
>  __cr4_set arch/x86/include/asm/tlbflush.h:180 [inline]
>  cr4_clear_bits arch/x86/include/asm/tlbflush.h:203 [inline]
>  kvm_cpu_vmxoff arch/x86/kvm/vmx.c:3582 [inline]
>  hardware_disable+0x34a/0x4b0 arch/x86/kvm/vmx.c:3588
>  kvm_arch_hardware_disable+0x35/0xd0 arch/x86/kvm/x86.c:7982
>  hardware_disable_nolock+0x30/0x40
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:3310
>  on_each_cpu+0xca/0x1b0 kernel/smp.c:604
>  hardware_disable_all_nolock+0x3e/0x50
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:3328
>  hardware_disable_all arch/x86/kvm/../../../virt/kvm/kvm_main.c:3334
> [inline]
>  kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:742 [inline]
>  kvm_put_kvm+0x956/0xdf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:755
>  kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:766
>  __fput+0x327/0x7e0 fs/file_table.c:210
>  ____fput+0x15/0x20 fs/file_table.c:244
>  task_work_run+0x199/0x270 kernel/task_work.c:113
>  exit_task_work include/linux/task_work.h:22 [inline]
>  do_exit+0x9bb/0x1ad0 kernel/exit.c:865
>  do_group_exit+0x149/0x400 kernel/exit.c:968
>  SYSC_exit_group kernel/exit.c:979 [inline]
>  SyS_exit_group+0x1d/0x20 kernel/exit.c:977
>  entry_SYSCALL_64_fastpath+0x1f/0x96
> RIP: 0033:0x441c78
> RSP: 002b:00007ffe68e20f68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
> RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000441c78
> RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
> RBP: 00000000006cd018 R08: 00000000000000e7 R09: ffffffffffffffd0
> R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000404080
> R13: 0000000000404110 R14: 0000000000000000 R15: 0000000000000000
> Code: 0f 1f 80 00 00 00 00 55 48 89 e5 0f 20 d8 5d c3 0f 1f 80 00 00 00 00
> 55 48 89 e5 0f 22 df 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 <0f> 22 e7 5d c3
> 0f 1f 80 00 00 00 00 55 48 89 e5 44 0f 20 c0 5d
> RIP: native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76 RSP:
> ffff8801ca6f75a0
> ---[ end trace ca14f0c15b26c251 ]---
>
>
> ---
> 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 merged into any tree, 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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