------------[ cut here ]------------
unexpected usercopy with bad or missing whitelist from skbuff_head_cache offset 76 size 4
WARNING: CPU: 1 PID: 18391 at mm/slab.c:4429 __check_heap_object+0xc7/0xd0 mm/slab.c:4428
netlink: 2 bytes leftover after parsing attributes in process `syz-executor0'.
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 18391 Comm: syz-executor1 Not tainted 4.15.0-rc4-next-20171220+ #77
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:177
 fixup_bug arch/x86/kernel/traps.c:246 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1079
RIP: 0010:__check_heap_object+0xc7/0xd0 mm/slab.c:4428
RSP: 0018:ffff8801bf0df510 EFLAGS: 00010286
RAX: dffffc0000000008 RBX: 1ffff10037e1beaa RCX: ffffffff8159f9ce
RDX: 0000000000001f9e RSI: ffffc90001e4d000 RDI: 0000000000000216
RBP: ffff8801bf0df518 R08: ffffffff86537ed8 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: ffffea0007003080
R13: ffff8801c00c240c R14: 0000000000000004 R15: ffffea0007003080
 check_heap_object mm/usercopy.c:222 [inline]
 __check_object_size+0x22c/0x4f0 mm/usercopy.c:248
 check_object_size include/linux/thread_info.h:112 [inline]
 check_copy_size include/linux/thread_info.h:143 [inline]
 copy_to_user include/linux/uaccess.h:154 [inline]
 put_cmsg+0x233/0x3f0 net/core/scm.c:242
 netlink_cmsg_listen_all_nsid net/netlink/af_netlink.c:1820 [inline]
 netlink_recvmsg+0xa7e/0x1300 net/netlink/af_netlink.c:1969
 sock_recvmsg_nosec net/socket.c:801 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:808
 ___sys_recvmsg+0x2a4/0x640 net/socket.c:2177
 __sys_recvmmsg+0x2a9/0xaf0 net/socket.c:2285
 SYSC_recvmmsg net/socket.c:2366 [inline]
 SyS_recvmmsg+0xc4/0x160 net/socket.c:2350
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a09
RSP: 002b:00007f2a0784cc58 EFLAGS: 00000212 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09
RDX: 0000000000000008 RSI: 0000000020aa2000 RDI: 0000000000000013
RBP: 000000000000056f R08: 000000002008d000 R09: 0000000000000000
R10: 0000000000002020 R11: 0000000000000212 R12: 00000000006f5308
R13: 00000000ffffffff R14: 00007f2a0784d6d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..