[Bug 274755] [ip6][lor] Witness reported lor on ipv6 add_m6if

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274755

            Bug ID: 274755
           Summary: [ip6][lor] Witness reported lor on ipv6 add_m6if
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: luc.techer64@gmail.com

While investigating this issue (https://redmine.pfsense.org/issues/12079) on my
system, I came accross the following LOR which looks very similar to the one
that was patched but for IPv6 multicast.

This is systematically reported during the boot but as not caused a panic yet
(contrary to the IPv4 equivalent LOR), maybe because I don't have any IPv6
multicast traffic on my network.

lock order reversal: (sleepable after non-sleepable)
 1st 0xffffffff8243d2d8 IPv6 multicast interfaces (IPv6 multicast interfaces,
sleep mutex) @ /root/pfsense_project/FreeBSD-src
/sys/netinet6/ip6_mroute.c:679
 2nd 0xfffff8000172a978 iflib ctx lock (iflib ctx lock, sx) @
/root/pfsense_project/FreeBSD-src/sys/net/iflib.c:4340
lock order IPv6 multicast interfaces -> iflib ctx lock attempted at:
#0 0xffffffff80cf8c0c at witness_checkorder+0xbcc
#1 0xffffffff80c980e3 at _sx_xlock+0x63
#2 0xffffffff80dec89a at iflib_if_ioctl+0x2da
#3 0xffffffff80dba87e at if_setflag+0xde
#4 0xffffffff80f5700c at X_ip6_mrouter_set+0xbac
#5 0xffffffff80d31297 at sosetopt+0xf7
#6 0xffffffff80d361ad at kern_setsockopt+0xad
#7 0xffffffff80d360f4 at sys_setsockopt+0x24
#8 0xffffffff8125661e at amd64_syscall+0x12e
#9 0xffffffff81228c6b at fast_syscall_common+0xf8

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