WARNING: CPU: 0 PID: 5275 at net/netlink/af_netlink.c:2398 netlink_ack+0x625/0xa10 net/netlink/af_netlink.c:2396
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5275 Comm: syz-executor4 Not tainted 4.15.0-rc6-mm1+ #52
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:1079
RIP: 0010:netlink_ack+0x625/0xa10 net/netlink/af_netlink.c:2396
RSP: 0018:ffff8801c660f790 EFLAGS: 00010206
RAX: 0000000000010000 RBX: ffff8801c8d75d40 RCX: ffffffff845abfb5
RDX: 0000000000000660 RSI: ffffc9000301a000 RDI: ffff8801c8d75e18
RBP: ffff8801c660f848 R08: ffffed0038cca1a5 R09: ffffed0038cca1a5
R10: 0000000000000003 R11: ffffed0038cca1a4 R12: ffff8801d0752574
R13: ffff8801c6650d00 R14: ffff8801c8d75ac0 R15: 1ffff10038cc1ef8
 netlink_rcv_skb+0x375/0x470 net/netlink/af_netlink.c:2447
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4540
 netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline]
 netlink_unicast+0x4c4/0x6b0 net/netlink/af_netlink.c:1334
 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1897
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2018
 __sys_sendmsg+0xe5/0x210 net/socket.c:2052
 SYSC_sendmsg net/socket.c:2063 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2059
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f5395741c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000008800 RSI: 00000000201dcfc8 RDI: 0000000000000013
RBP: 000000000000039b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3728
R13: 00000000ffffffff R14: 00007f53957426d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..