The branch stable/11 has been updated by donner:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=370c8a1f784c62d0cf28aa1202a0575add1b3559

commit 370c8a1f784c62d0cf28aa1202a0575add1b3559
Author:     Lutz Donnerhacke <don...@freebsd.org>
AuthorDate: 2021-05-02 20:47:04 +0000
Commit:     Lutz Donnerhacke <don...@freebsd.org>
CommitDate: 2021-05-17 06:16:45 +0000

    service/ipfw: Silence warning on restart
    
    Once the ipfw0 interface has been created, ifconfig(8) create will
    throw a warning: "ifconfig: create: bad value" when trying to create
    it again.
    
    PR:             241013
    Submitted by:   Jose Luis Duran
    Approved by:    kp
    Differential Revision: https://reviews.freebsd.org/D30083
    
    (cherry picked from commit 5c4fe2ac81a5e05062266d684fb53b9faefd0d38)
---
 etc/rc.d/ipfw | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/etc/rc.d/ipfw b/etc/rc.d/ipfw
index ef85e3d88d13..b93d16026fe4 100755
--- a/etc/rc.d/ipfw
+++ b/etc/rc.d/ipfw
@@ -74,8 +74,14 @@ ipfw_start()
                ${SYSCTL} net.inet.ip.fw.verbose=1 >/dev/null
        fi
        if checkyesno firewall_logif; then
-               ifconfig ipfw0 create
-               echo 'Firewall logging pseudo-interface (ipfw0) created.'
+               if ! ifconfig ipfw0 >/dev/null 2>&1; then
+                       ifconfig ipfw0 create
+                       echo 'Firewall logging pseudo-interface (ipfw0)' \
+                           'created.'
+               else
+                       echo 'Firewall logging pseudo-interface (ipfw0)' \
+                           'already created.'
+               fi
        fi
 }
 
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