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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: 1 PID: 16700 Comm: syz-executor3 Not tainted 4.15.0-rc1-mm1+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 0000000015b992b9 task.stack: 000000005c730374
RIP: 0010:report_usercopy mm/usercopy.c:76 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:276
RSP: 0018:ffff8801cf30f158 EFLAGS: 00010286
RAX: 0000000000000062 RBX: ffffffff853292c0 RCX: 0000000000000000
RDX: 0000000000000062 RSI: ffffc90001fee000 RDI: ffffed0039e61e1f
RBP: ffff8801cf30f248 R08: 1ffff10039e61dad R09: 0000000000000000
R10: 0000000031f2cf6d R11: 0000000000000000 R12: ffffffff85329280
R13: ffff8801d19804d0 R14: 0000000000000400 R15: ffffea0007466000
FS:  00007fb67ea70700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d09e66db8 CR3: 00000001c39a7000 CR4: 00000000001426e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 check_object_size include/linux/thread_info.h:112 [inline]
 check_copy_size include/linux/thread_info.h:143 [inline]
 copy_from_user include/linux/uaccess.h:146 [inline]
 memdup_user+0x46/0x90 mm/util.c:168
 kvm_arch_vcpu_ioctl+0x1ba3/0x4710 arch/x86/kvm/x86.c:3501
 kvm_vcpu_ioctl+0x240/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2726
 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:00007fb67ea6fc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 000000002023bc00 RSI: 000000004400ae8f RDI: 0000000000000016
RBP: 00000000000001f1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006eff38
R13: 00000000ffffffff R14: 00007fb67ea706d4 R15: 0000000000000000
Code: 48 0f 44 da e8 d0 49 c2 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 80 93 32 85 49 89 c0 e8 13 03 ac ff <0f> 0b 48 c7 c0 40 91 32 85 eb 96 48 c7 c0 80 91 32 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:76 [inline] RSP: ffff8801cf30f158
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:276 RSP: ffff8801cf30f158
---[ end trace 0ddb92df609e70ef ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..