------------[ cut here ]------------
WARNING: CPU: 1 PID: 7446 at net/key/af_key.c:111 pfkey_sock_destruct+0x307/0x350 net/key/af_key.c:111()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7446 Comm: syz-executor1 Not tainted 4.4.150-g5541782 #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 a849bf03ea8d2f7b ffff8800a3b7fbc8 ffffffff81e14e2d
 ffffffff83a44e40 ffff8801bdafe000 ffffffff83f40480 0000000000000009
 000000000000006f ffff8800a3b7fc88 ffffffff8140d3c4 0000000041b58ab3
Call Trace:
 [<ffffffff81e14e2d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e14e2d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8140d3c4>] panic+0x19e/0x38d kernel/panic.c:112
 [<ffffffff8140d5e8>] warn_slowpath_common.cold.6+0x20/0x20 kernel/panic.c:455
 [<ffffffff81133069>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff8359dbf7>] pfkey_sock_destruct+0x307/0x350 net/key/af_key.c:111
 [<ffffffff82f36e3c>] sk_destruct+0x4c/0x4c0 net/core/sock.c:1447
 [<ffffffff82f372ff>] __sk_free+0x4f/0x220 net/core/sock.c:1480
 [<ffffffff82f37500>] sk_free+0x30/0x40 net/core/sock.c:1491
 [<ffffffff835882c3>] sock_put include/net/sock.h:1639 [inline]
 [<ffffffff835882c3>] pfkey_release+0x263/0x2f0 net/key/af_key.c:194
 [<ffffffff82f21c86>] sock_release+0x96/0x1c0 net/socket.c:587
 [<ffffffff82f21dc6>] sock_close+0x16/0x20 net/socket.c:1038
 [<ffffffff815277d5>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81527d15>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118ed2f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
 [<ffffffff8100362d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100362d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:253
 [<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:284 [inline]
 [<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:349
 [<ffffffff838cb235>] int_ret_from_sys_call+0x25/0xa3
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..