device lo left promiscuous mode
usercopy: kernel memory overwrite attempt detected to 00000000c5bb0e02 (kmalloc-1024) (968 bytes)
------------[ 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: 1 PID: 29116 Comm: syz-executor4 Not tainted 4.15.0-rc2+ #146
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 000000007aabe731 task.stack: 000000006626a89e
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff8801c129fa50 EFLAGS: 00010282
RAX: 0000000000000061 RBX: ffffffff85328580 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc90002068000 RDI: ffffed0038253f3e
RBP: ffff8801c129fb40 R08: ffff8801c129f338 R09: 0000000000000000
R10: 0000000090f61e1e R11: 0000000000000000 R12: ffffffff85328540
R13: ffff8801d3dc7710 R14: 00000000000003c8 R15: ffffea00074f7180
FS:  00007f8689fe8700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9d1cee2638 CR3: 00000001d37dd000 CR4: 00000000001406e0
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]
 ___sys_sendmsg+0x58f/0x8a0 net/socket.c:2025
 __sys_sendmsg+0xe5/0x210 net/socket.c:2082
 SYSC_sendmsg net/socket.c:2093 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2089
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f8689fe7c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000000048000 RSI: 000000002027d000 RDI: 0000000000000015
RBP: 000000000000039b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2728
R13: 00000000ffffffff R14: 00007f8689fe86d4 R15: 0000000000000000
Code: 48 0f 44 da e8 c0 6f c2 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 40 86 32 85 49 89 c0 e8 b3 2d ac ff <0f> 0b 48 c7 c0 00 84 32 85 eb 96 48 c7 c0 40 84 32 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801c129fa50
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801c129fa50
---[ end trace cbb1d1dc9b447c4d ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..