------------[ cut here ]------------
WARNING: CPU: 1 PID: 7956 at net/xfrm/xfrm_user.c:2113 xfrm_add_pol_expire+0x5af/0x6e0 net/xfrm/xfrm_user.c:2113()
Don't know what to do with soft policy expire
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7956 Comm: syz-executor.1 Not tainted 4.4.174+ #4
 0000000000000000 1d9e753c56b49e8e ffff8801c562f440 ffffffff81aad1a1
 ffff8801c562f590 ffffffff82835ee0 ffffffff82a9d500 0000000000000841
 ffffffff825746bf ffff8801c562f520 ffffffff813a48c2 0000000041b58ab3
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813a48c2>] panic+0x1b9/0x37b kernel/panic.c:112
 [<ffffffff813a4ab9>] warn_slowpath_common kernel/panic.c:455 [inline]
 [<ffffffff813a4ab9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
 [<ffffffff810d394f>] warn_slowpath_fmt+0xbf/0x100 kernel/panic.c:471
 [<ffffffff825746bf>] xfrm_add_pol_expire+0x5af/0x6e0 net/xfrm/xfrm_user.c:2113
 [<ffffffff8257888c>] xfrm_user_rcv_msg+0x37c/0x630 net/xfrm/xfrm_user.c:2563
 [<ffffffff822f06e4>] netlink_rcv_skb+0xd4/0x2e0 net/netlink/af_netlink.c:2361
 [<ffffffff82571210>] xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2571
 [<ffffffff822ef137>] netlink_unicast_kernel net/netlink/af_netlink.c:1277 [inline]
 [<ffffffff822ef137>] netlink_unicast+0x4d7/0x700 net/netlink/af_netlink.c:1303
 [<ffffffff822efb86>] netlink_sendmsg+0x6b6/0xc80 net/netlink/af_netlink.c:1859
 [<ffffffff821d838e>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821d838e>] sock_sendmsg+0xbe/0x110 net/socket.c:648
 [<ffffffff821da269>] ___sys_sendmsg+0x769/0x890 net/socket.c:1975
 [<ffffffff821dd0c5>] __sys_sendmsg+0xc5/0x160 net/socket.c:2009
 [<ffffffff821dd18d>] SYSC_sendmsg net/socket.c:2020 [inline]
 [<ffffffff821dd18d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2016
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Kernel Offset: disabled
Rebooting in 86400 seconds..