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Bad or missing usercopy whitelist? Kernel memory exposure attempt detected from SLAB object 'skbuff_head_cache' (offset 84, size 4)!
WARNING: CPU: 0 PID: 24363 at mm/usercopy.c:81 usercopy_warn+0xdb/0x100 mm/usercopy.c:76
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 24363 Comm: syz-executor0 Not tainted 4.15.0+ #208
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:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:984
RIP: 0010:usercopy_warn+0xdb/0x100 mm/usercopy.c:76
RSP: 0018:ffff8801c7e77108 EFLAGS: 00010282
RAX: dffffc0000000008 RBX: ffffffff868009c7 RCX: ffffffff815a585e
RDX: 00000000000066fd RSI: ffffc90002d31000 RDI: 1ffff10038fceda6
RBP: ffff8801c7e77160 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000006f2 R11: 0000000000000000 R12: ffffffff86402580
R13: ffffffff85f2d4c0 R14: 0000000000000054 R15: 0000000000000004
 __check_heap_object+0x89/0xc0 mm/slab.c:4426
 check_heap_object mm/usercopy.c:236 [inline]
 __check_object_size+0x272/0x530 mm/usercopy.c:259
 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_compat+0x724/0xa50 net/compat.c:254
 put_cmsg+0x33a/0x3f0 net/core/scm.c:225
 sock_recv_drops net/socket.c:788 [inline]
 __sock_recv_ts_and_drops+0x2cc/0x370 net/socket.c:796
 sock_recv_ts_and_drops include/net/sock.h:2262 [inline]
 udp_recvmsg+0x92d/0x1260 net/ipv4/udp.c:1633
 inet_recvmsg+0x16b/0x620 net/ipv4/af_inet.c:796
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:810
 ___sys_recvmsg+0x2a4/0x640 net/socket.c:2205
 __sys_recvmmsg+0x556/0xaf0 net/socket.c:2305
 C_SYSC_recvmmsg net/compat.c:780 [inline]
 compat_SyS_recvmmsg+0xb6/0x150 net/compat.c:766
 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 do_fast_syscall_32+0x3ee/0xfa1 arch/x86/entry/common.c:392
 entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:129
RIP: 0023:0xf7fb5c79
RSP: 002b:00000000f779008c EFLAGS: 00000296 ORIG_RAX: 0000000000000151
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000020b39000
RDX: 0000000000000005 RSI: 0000000000000001 RDI: 0000000020f0cff8
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..