kern/54406: system panics when NPF is set to start on boot

[venture37%geeklan.co.uk@localhost]

>Number:         54406
>Category:       kern
>Synopsis:       system panics when NPF is set to start on boot
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 24 09:45:00 +0000 2019
>Originator:     Sevan Janiyan
>Release:        HEAD 201907232140Z
>Organization:
>Environment:
>Description:
System panics when npf is set to start on boot via rc.conf.
System does not panic if started manually at console with 'service npf onestart'

panic: kmem_free(0xfffffe6044fbf0d8, 28) != allocated size 0
cpu0: Begin traceback...
vpanic()
snprintf()
kmem_alloc()
nvpair_create_stringv()
nvlist_add_stringv()
nvlist_add_stringf()
npf_mk_params()
npfctl_load()
VOP_IOCTL()
vn_ioctl()
sys_ioctl()
syscall()
-- syscal (number 54) ---
>How-To-Repeat:
copy /usr/share/examples/npf/host-npf.conf to /etc/npf.conf
set npf=YES in /etc/rc.conf
reboot
>Fix: