netdev - 2.6.38-rc1: arp triggers RTNL assertion

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Date:	Thu, 20 Jan 2011 22:17:58 -0800
From:	Jamie Heilman <jamie@...ible.transient.net>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:	eric.dumazet@...il.com
Subject: 2.6.38-rc1: arp triggers RTNL assertion

With 2.6.38-rc1 when I run: arp -Ds 192.168.2.41 eth0 pub
I see:

RTNL: assertion failed at net/core/neighbour.c (589)
Pid: 2330, comm: arp Not tainted 2.6.38-rc1-00132-g8d99641-dirty #1
Call Trace:
 [<c11ed339>] ? pneigh_lookup+0xc3/0x168
 [<c1219f27>] ? arp_req_set+0x86/0x1d5
 [<c11e74b5>] ? dev_get_by_name_rcu+0x72/0x7f
 [<c121a1a3>] ? arp_ioctl+0x12d/0x22e
 [<c121dfeb>] ? inet_ioctl+0x82/0xa7
 [<c11d8ffc>] ? sock_ioctl+0x1b7/0x1db
 [<c11d8e45>] ? sock_ioctl+0x0/0x1db
 [<c108f02f>] ? do_vfs_ioctl+0x47c/0x4c5
 [<c101803c>] ? do_page_fault+0x315/0x341
 [<c11daaf3>] ? sys_socket+0x44/0x5a
 [<c11dab71>] ? sys_socketcall+0x68/0x270
 [<c108f0ab>] ? sys_ioctl+0x33/0x4b
 [<c1002897>] ? sysenter_do_call+0x12/0x26

Figured I'd Cc Eric as this could be related to commit 941666c2,
"net: RCU conversion of dev_getbyhwaddr() and arp_ioctl()"

Config attached, just in case (the uncommited change, in the tree this
kernel was built from, is just Chuck Lever's recent nfs3xdr.c patch).

View attachment "config-2.6.38-rc1-00132-g8d99641-dirty" of type "text/plain" (55987 bytes)