usercopy: kernel memory overwrite attempt detected to 00000000d447b569 (kmalloc-1024) (992 bytes)
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kernel BUG at mm/usercopy.c:84!
invalid opcode: 0000 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 14732 Comm: syz-executor6 Not tainted 4.15.0-rc3-next-20171214+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:report_usercopy mm/usercopy.c:76 [inline]
RIP: 0010:__check_object_size+0x1e2/0x250 mm/usercopy.c:276
RSP: 0018:ffffc90000f4fb48 EFLAGS: 00010292
RAX: 0000000000000061 RBX: ffffffff82e57be7 RCX: ffffffff8123dede
RDX: 0000000000003dc4 RSI: ffffc900010a9000 RDI: ffff88021fd136f8
RBP: ffffc90000f4fb80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880211a33450
R13: 00000000000003e0 R14: 0000000000000000 R15: ffffffff82edf8a5
FS:  00007f637f08c700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000071c000 CR3: 000000020ddac002 CR4: 00000000001626e0
DR0: 0000000020001000 DR1: 0000000020001000 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]
 rw_copy_check_uvector+0x6f/0x1b0 fs/read_write.c:760
 import_iovec+0x3e/0x100 lib/iov_iter.c:1398
 copy_msghdr_from_user+0x133/0x1c0 net/socket.c:1945
 ___sys_recvmsg+0x94/0x2b0 net/socket.c:2173
 __sys_recvmmsg+0xe9/0x390 net/socket.c:2293
 SYSC_recvmmsg net/socket.c:2374 [inline]
 SyS_recvmmsg+0x75/0xf0 net/socket.c:2358
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a09
RSP: 002b:00007f637f08bc58 EFLAGS: 00000212 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09
RDX: 0000000000000002 RSI: 0000000020f7b000 RDI: 0000000000000014
RBP: 0000000000000001 R08: 000000002007e000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ed0b8
R13: 00000000ffffffff R14: 00007f637f08c6d4 R15: 0000000000000000
Code: 7b e5 82 48 0f 44 da e8 8d 82 eb ff 48 8b 45 d0 4d 89 e9 4c 89 e1 4c 89 fa 48 89 de 48 c7 c7 a8 51 e6 82 49 89 c0 e8 76 b7 e3 ff <0f> 0b 48 c7 c0 43 51 e6 82 eb a1 48 c7 c0 53 51 e6 82 eb 98 48 
RIP: report_usercopy mm/usercopy.c:76 [inline] RSP: ffffc90000f4fb48
RIP: __check_object_size+0x1e2/0x250 mm/usercopy.c:276 RSP: ffffc90000f4fb48
---[ end trace f6aedea7ee6d1b0a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..