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From: Michael Plass <mfp49_freebsd@plass-family.net>
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Subject: LOR involving igmp on 11.0-ALPHA5
Date: Sat, 2 Jul 2016 15:48:24 -0700
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Cc: Michael Plass <mfp49_freebsd@plass-family.net>
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FreeBSD xx 11.0-ALPHA5 FreeBSD 11.0-ALPHA5 #0 r302164: Fri Jun 24 =
02:51:52 UTC 2016     =
root@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64

lock order reversal:
1st 0xfffff80003cff990 if_addr_lock (if_addr_lock) @ =
/usr/src/sys/netinet/igmp.c:1716
2nd 0xffffffff81d7b660 ifnet_rw (ifnet_rw) @ /usr/src/sys/net/if.c:258

More details (with stack) are at
    https://gist.github.com/mfplass/aa7c78640af1309699e908c4d73c0d40

I've seen this twice.

Thanks,
- Michael=