kernel BUG at mm/usercopy.c:72!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 25969 Comm: syz-executor6 Not tainted 4.15.0-rc3+ #157
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff8801cc157858 EFLAGS: 00010286
RAX: 0000000000000061 RBX: ffffffff85328c40 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc90002005000 RDI: ffffed003982aeff
RBP: ffff8801cc157948 R08: 0000000000000000 R09: 0000000000000000
R10: 000000001e6c607c R11: 0000000000000000 R12: ffffffff85328c00
R13: ffff8801d499e050 R14: 00000000000003d0 R15: ffffea0007526780
FS:  00007fc76d96d700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000101dcd8 CR3: 00000001bcccd005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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]
 rw_copy_check_uvector+0x73/0x280 fs/read_write.c:760
 import_iovec+0xc8/0x430 lib/iov_iter.c:1398
 copy_msghdr_from_user+0x39b/0x590 net/socket.c:1945
 ___sys_sendmsg+0x12d/0x890 net/socket.c:1971
 __sys_sendmsg+0xe5/0x210 net/socket.c:2060
 SYSC_sendmsg net/socket.c:2071 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2067
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a09
RSP: 002b:00007fc76d96cc58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09
RDX: 0000000020000004 RSI: 0000000020002000 RDI: 0000000000000013
RBP: 000000000000039b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2728
R13: 00000000ffffffff R14: 00007fc76d96d6d4 R15: 0000000000000000
Code: 48 0f 44 da e8 40 c4 c1 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 00 8d 32 85 49 89 c0 e8 c6 88 ab ff <0f> 0b 48 c7 c0 c0 8a 32 85 eb 96 48 c7 c0 00 8b 32 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801cc157858
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801cc157858
---[ end trace d15adc0a3e26f39e ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..