[Bug 223093] /dev/pf locks disrupt other pf-dependent services (ftp-proxy, tftp-proxy, relayd, pfctl, etc)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223093

            Bug ID: 223093
           Summary: /dev/pf locks disrupt other pf-dependent services
                    (ftp-proxy, tftp-proxy, relayd, pfctl, etc)
           Product: Base System
           Version: 10.4-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jjasen at gmail.com

A firewall system running pf, with ftp-proxy, tftp-proxy and relayd in active
use can encounter conditions where one or more of the supporting services or
utilities will fail.

For example, while ftp-proxy has a lock on /dev/pf, relayd cannot make changes
and will crash (reference bug 213859). 

Additionally, if tftp-proxy has a lock on /dev/pf, the ftp-proxy connection
will fail. Conversely, if something has a lock on /dev/pf, tftp-proxy will
abort and retry.

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