WARNING: CPU: 0 PID: 517 at net/xfrm/xfrm_policy.c:752 xfrm_policy_insert+0x883/0x1140 net/xfrm/xfrm_policy.c:752
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 517 Comm: syz-executor4 Not tainted 4.15.0-rc5+ #179
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:1061
RIP: 0010:xfrm_policy_insert+0x883/0x1140 net/xfrm/xfrm_policy.c:752
RSP: 0018:ffff8801d42af3b0 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff8801bd0cb680 RCX: ffffffff84a8c6b3
RDX: 000000000000048a RSI: ffffc90002108000 RDI: ffff8801bd0cb8a0
RBP: ffff8801d42af540 R08: 0000000000000000 R09: 0000000000000004
R10: ffff8801d42af268 R11: 0000000000000004 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
 xfrm_add_policy+0x3dc/0x8a0 net/xfrm/xfrm_user.c:1601
 xfrm_user_rcv_msg+0x422/0x860 net/xfrm/xfrm_user.c:2591
 netlink_rcv_skb+0x224/0x470 net/netlink/af_netlink.c:2441
 xfrm_netlink_rcv+0x6f/0x90 net/xfrm/xfrm_user.c:2599
 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:00007f75bbfb2c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000000000 RSI: 0000000020001000 RDI: 0000000000000013
RBP: 0000000000000156 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f00b0
R13: 00000000ffffffff R14: 00007f75bbfb36d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..