------------[ cut here ]------------
WARNING: CPU: 1 PID: 4250 at net/xfrm/xfrm_policy.c:797 xfrm_policy_insert+0x6fa/0x10e0 net/xfrm/xfrm_policy.c:797
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4250 Comm: syz-executor.5 Not tainted 4.9.194+ #0
 ffff880187d4f3b0 ffffffff81b67001 0000000000000000 ffffffff82a3b3c0
 00000000ffffffff 0000000000000001 0000000000000009 ffff880187d4f490
 ffffffff813fef3a 0000000041b58ab3 ffffffff82e32f55 ffffffff813fed61
Call Trace:
 [<000000009081c014>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000009081c014>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000173f8eb5>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<00000000a329a11e>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<00000000669f9ed6>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<000000002413161c>] xfrm_policy_insert+0x6fa/0x10e0 net/xfrm/xfrm_policy.c:797
 [<00000000202ae6c8>] xfrm_add_policy+0x23c/0x4b0 net/xfrm/xfrm_user.c:1636
 [<00000000682cf13b>] xfrm_user_rcv_msg+0x32c/0x5e0 net/xfrm/xfrm_user.c:2615
 [<00000000181b7a72>] netlink_rcv_skb+0xd4/0x2e0 net/netlink/af_netlink.c:2365
 [<00000000779a7d73>] xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2623
 [<000000004b2a8e18>] netlink_unicast_kernel net/netlink/af_netlink.c:1285 [inline]
 [<000000004b2a8e18>] netlink_unicast+0x4c6/0x6d0 net/netlink/af_netlink.c:1311
 [<00000000ae005762>] netlink_sendmsg+0x6b6/0xc80 net/netlink/af_netlink.c:1859
 [<0000000056017e8e>] sock_sendmsg_nosec net/socket.c:649 [inline]
 [<0000000056017e8e>] sock_sendmsg+0xbe/0x110 net/socket.c:659
 [<00000000b8676b27>] ___sys_sendmsg+0x78b/0x8b0 net/socket.c:1983
 [<000000007d48edcb>] __sys_sendmsg+0xc8/0x170 net/socket.c:2017
 [<00000000b5260cbf>] SYSC_sendmsg net/socket.c:2028 [inline]
 [<00000000b5260cbf>] SyS_sendmsg+0x2d/0x50 net/socket.c:2024
 [<000000007408cae2>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<0000000000edffe4>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..