[Bug 200320] pfSync causes crashes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200320

            Bug ID: 200320
           Summary: pfSync causes crashes
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: eri at pfsense.org

Pfsync in FreeBSD 10.0++ causes crashes when trying to synchronize states
between two firewalls.
The panic here is reached
http://fxr.watson.org/fxr/source/netpfil/pf/if_pfsync.c?v=FREEBSD10#L1779 due
to not found defer state after pf(4) itself defered a state.

Reference: https://redmine.pfsense.org/issues/4310

Primary root cause of the crashes seems to be the defer option of pfsync which
defers states on pf(4) to be treated by pfsync after.
This is on as default on FreeBSD which should not be since active-active is not
supported.

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