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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: 5805 Comm: syz-executor2 Not tainted 4.13.0-rc4-next-20170811 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88003a326780 task.stack: ffff880039320000
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3ad/0x500 mm/usercopy.c:264
RSP: 0018:ffff8800393278a8 EFLAGS: 00010286
RAX: 0000000000000078 RBX: ffffffff84710e80 RCX: 0000000000000000
RDX: 0000000000000078 RSI: ffffffff8158663e RDI: ffffed0007264f09
RBP: ffff880039327998 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880039e4a051
R13: fffffffffffffff7 R14: ffffffff84710e40 R15: dffffc0000000000
FS:  00007f2419acd700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020c39000 CR3: 000000003acd7000 CR4: 00000000000006f0
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: 0033:0x446739
RSP: 002b:00007f2419accc08 EFLAGS: 00000282 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000446739
RDX: 0000000000000000 RSI: 0000000020d3b000 RDI: 0000000000000006
RBP: 0000000000000086 R08: 0000000020d52000 R09: 000000000000000a
R10: 0000000000000042 R11: 0000000000000282 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2419acd9c0 R15: 00007f2419acd700
Code: 48 0f 44 da e8 b5 57 c9 ff 48 8b 85 28 ff ff ff 4d 89 e9 4c 89 e1 4c 89 f2 48 89 de 48 c7 c7 c0 0e 71 84 49 89 c0 e8 e8 82 b4 ff <0f> 0b 48 c7 c0 80 0c 71 84 eb 96 48 c7 c0 c0 0c 71 84 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8800393278a8
RIP: __check_object_size+0x3ad/0x500 mm/usercopy.c:264 RSP: ffff8800393278a8
---[ end trace edaaac8c4395b5fc ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..