From owner-freebsd-net@FreeBSD.ORG  Thu Nov 22 00:31:49 2012
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From: Rui Paulo <rpaulo@FreeBSD.org>
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Subject: LOR in rtsock/ifnet
Date: Wed, 21 Nov 2012 16:31:47 -0800
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Cc: Hiroki Sato <hrs@allbsd.org>, "Andrey V. Elsukov" <ae@FreeBSD.org>
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I just started seeing this on r243286.

lock order reversal:
 1st 0xfffffe0001b40400 if_addr_lock (if_addr_lock) @ =
/usr/home/rpaulo/freebsd/head/sys/net/rtsock.c:1818
 2nd 0xffffffff80c693f8 ifnet_rw (ifnet_rw) @ =
/usr/home/rpaulo/freebsd/head/sys/net/if.c:241
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b
kdb_backtrace() at kdb_backtrace+0x39
witness_checkorder() at witness_checkorder+0xc37
__rw_rlock() at __rw_rlock+0x8c
ifnet_byindex() at ifnet_byindex+0x22
sa6_recoverscope() at sa6_recoverscope+0x7b
rt_msg2() at rt_msg2+0x1a2
sysctl_rtsock() at sysctl_rtsock+0x68c
sysctl_root() at sysctl_root+0x1d7
userland_sysctl() at userland_sysctl+0x192
sys___sysctl() at sys___sysctl+0x74
amd64_syscall() at amd64_syscall+0x265
Xfast_syscall() at Xfast_syscall+0xfb
--- syscall (202, FreeBSD ELF64, sys___sysctl), rip =3D 0x8011813ea, rsp =
=3D 0x7fffffffd408, rbp =3D 0x7fffffffd440 ---

Regards,
--
Rui Paulo