------------[ cut here ]------------
kernel BUG at mm/usercopy.c:72!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 2 PID: 3616 Comm: syz-executor7 Not tainted 4.13.0-rc4-next-20170811 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff8800685ca180 task.stack: ffff880058348000
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3ad/0x500 mm/usercopy.c:264
RSP: 0018:ffff88005834f5a8 EFLAGS: 00010286
RAX: 0000000000000078 RBX: ffffffff84710e80 RCX: 0000000000000000
RDX: 0000000000000078 RSI: ffffffff8158663e RDI: ffffed000b069ea9
RBP: ffff88005834f698 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88003a1da7ca
R13: ffffffffffffffff R14: ffffffff84710e40 R15: dffffc0000000000
FS:  00007fce06e19700(0000) GS:ffff88006e000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020b83000 CR3: 00000000563f1000 CR4: 00000000000006e0
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
 ___sys_recvmsg+0x295/0x620 net/socket.c:2208
 __sys_recvmmsg+0x2a9/0xaf0 net/socket.c:2316
 SYSC_recvmmsg net/socket.c:2397 [inline]
 SyS_recvmmsg+0xc4/0x160 net/socket.c:2381
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x446739
RSP: 002b:00007fce06e18c08 EFLAGS: 00000282 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000446739
RDX: 0000000000000004 RSI: 00000000208dbe80 RDI: 0000000000000005
RBP: 0000000000000086 R08: 0000000020000000 R09: 0000000000000000
R10: 0000000000010003 R11: 0000000000000282 R12: 00000000ffffffff
R13: 0000000000005750 R14: 00000000006e7810 R15: 0000000000000006
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: ffff88005834f5a8
RIP: __check_object_size+0x3ad/0x500 mm/usercopy.c:264 RSP: ffff88005834f5a8
---[ end trace a9293cd03951efa6 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..