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kernel BUG at mm/usercopy.c:72!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3550 Comm: syz-executor2 Not tainted 4.13.0-rc4+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c6d0c6c0 task.stack: ffff8801cbb28000
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff8801cbb2f8a8 EFLAGS: 00010286
RAX: 0000000000000078 RBX: ffffffff84f15bc0 RCX: 0000000000000000
RDX: 0000000000000078 RSI: ffffffff81592f0e RDI: ffffed0039765f09
RBP: ffff8801cbb2f998 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff84f15b80
R13: ffff8801d190aa87 R14: ffffffffffffffc7 R15: ffff8801d190aa87
FS:  00007f76df9c7700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc578c2ff8 CR3: 00000001cad31000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 check_object_size include/linux/thread_info.h:108 [inline]
 check_copy_size include/linux/thread_info.h:139 [inline]
 copy_to_iter include/linux/uio.h:105 [inline]
 copy_linear_skb include/net/udp.h:371 [inline]
 udpv6_recvmsg+0x1040/0x1af0 net/ipv6/udp.c:399
 inet_recvmsg+0x14c/0x5f0 net/ipv4/af_inet.c:793
 sock_recvmsg_nosec net/socket.c:806 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:813
 SYSC_recvfrom+0x2d6/0x570 net/socket.c:1802
 SyS_recvfrom+0x40/0x50 net/socket.c:1774
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4512e9
RSP: 002b:00007f76df9c6c08 EFLAGS: 00000216 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004512e9
RDX: 0000000000000042 RSI: 0000000020dfd000 RDI: 0000000000000005
RBP: 0000000000000086 R08: 0000000020000000 R09: 0000000000000000
R10: 0000000000000042 R11: 0000000000000216 R12: 00000000004b70fd
R13: 00000000ffffffff R14: 0000000020ee2000 R15: 0000000000001000
Code: 48 0f 44 da e8 60 49 c6 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 00 5c f1 84 49 89 c0 e8 43 72 b1 ff <0f> 0b 48 c7 c0 c0 59 f1 84 eb 96 48 c7 c0 00 5a f1 84 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801cbb2f8a8
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801cbb2f8a8
---[ end trace 3853105aa9a2b844 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..