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kernel BUG at mm/usercopy.c:84!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 2978 Comm: syzkaller414675 Not tainted 4.14.0-rc5-next-20171018+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88003d642600 task.stack: ffff88003a328000
RIP: 0010:report_usercopy mm/usercopy.c:76 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:276
RSP: 0018:ffff88003a32f148 EFLAGS: 00010286
RAX: 000000000000005d RBX: ffffffff8511a0e0 RCX: 0000000000000000
RDX: 000000000000005d RSI: 1ffff10007465de9 RDI: ffffed0007465e1d
RBP: ffff88003a32f238 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8511a0a0
R13: ffff88006d3e9bd4 R14: 0000000000000348 R15: ffffea0001b4fa00
FS:  0000000001829880(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005613f41d8008 CR3: 000000006bc25000 CR4: 00000000000026f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 check_object_size include/linux/thread_info.h:111 [inline]
 check_copy_size include/linux/thread_info.h:142 [inline]
 copy_from_user include/linux/uaccess.h:145 [inline]
 kvm_vcpu_ioctl_set_cpuid2+0x75/0x1a0 arch/x86/kvm/cpuid.c:245
 kvm_arch_vcpu_ioctl+0x1718/0x4710 arch/x86/kvm/x86.c:3521
 kvm_vcpu_ioctl+0x240/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2703
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x437f17
RSP: 002b:00007ffeb9b2d6c8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffeb9b2dd90 RCX: 0000000000437f17
RDX: 00007ffeb9b2dd90 RSI: 000000004008ae90 RDI: 0000000000000005
RBP: 0000000000000082 R08: 0000000000000001 R09: 0000000000000040
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000
R13: 0000000000404090 R14: 0000000000000004 R15: 0000000000000000
Code: 48 0f 44 da e8 70 f0 c3 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 a0 a1 11 85 49 89 c0 e8 c3 fb ad ff <0f> 0b 48 c7 c0 60 9f 11 85 eb 96 48 c7 c0 a0 9f 11 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:76 [inline] RSP: ffff88003a32f148
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:276 RSP: ffff88003a32f148
---[ end trace 50d6d76d3992ba1f ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..