[Bug 224414] 'kldload pf' or 'pf_enable="YES"' triggers immediate panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224414

            Bug ID: 224414
           Summary: 'kldload pf' or 'pf_enable="YES"' triggers immediate
                    panic
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: freebsd-bugzilla at senator.net

Adding
   pf_enable="YES"

to /boot/loader.conf or /boot/loader.conf.local or, after a full boot,
   modload pf
causes an immediate kernel panic. This is reproducible on the (FreeBSD Mall
11.1 purchased) installation CD by selecting 'Shell' and then executing:
modload pf

This system was reliably in service for >3+ years running FreeBSD 9.0-RELEASE.
Upgrading to 11.1-RELEASE appears to have introduced this symptom.
1
# ls -l /boot/kernel/pf.ko
 ... 348024 July 21 02:20 /boot/kernel/pf.ko

# sum /boot/kernel/pf.ko
 13544 340 /boot/kernel/pf.ko

Kernel version: 11.1-RELEASE r321309 Fri Jul 21 02:08:28 UTC 2017
root at releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64

Motherboard: SuperMicro X7DB8-X
http://www.supermicro.com/products/motherboard/xeon1333/5000P/X7DB8-X.cfm

NICs: Intel Pro/1000 (quantity 3) - detected as em[0-2]

Disk controllers: 3Ware 9550SXU-4LP (quantity 2) - detected as twa[0-1]

I am in the process of reinstalling this with a larger /var so as to enable
crash dumps.

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