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Date:   Tue, 19 Dec 2017 23:49:01 -0800
From:   syzbot 
Subject: general protection fault in native_write_cr4


syzkaller hit the following crash on  
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See
for information about syzkaller reproducers

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
  on_each_cpu+0xca/0x1b0 kernel/smp.c:604
  hardware_disable_all arch/x86/kvm/../../../virt/kvm/kvm_main.c:3334  
  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
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:  
---[ end trace ca14f0c15b26c251 ]---

This bug is generated by a dumb bot. It may contain errors.
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Please credit me with: Reported-by: syzbot <>

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