'RTNL: assertion failed at net/core/dev.c (4035)' in dmesg when loading ciscocdp module

Issue

In dmesg output there is a message 'RTNL: assertion failed at net/core/dev.c (4035)' with following backtrace:

RTNL: assertion failed at net/core/dev.c (4035)
Pid: 858, comm: insmod Tainted: P           ----------------   2.6.32-220.31.1.el6.x86_64 #1
Call Trace:
 [<ffffffff8142c624>] ? dev_set_allmulti+0xe4/0xf0
 [<ffffffffa01e4c65>] ? cdp_add_device+0x215/0x320 [ciscocdp]
 [<ffffffffa01f31bd>] ? cdp_init_module+0x1bd/0x2e1 [ciscocdp]
 [<ffffffffa01f3000>] ? cdp_init_module+0x0/0x2e1 [ciscocdp]
 [<ffffffff8100204c>] ? do_one_initcall+0x3c/0x1d0
 [<ffffffff810afbe1>] ? sys_init_module+0xe1/0x250
 [<ffffffff8100b0f2>] ? system_call_fastpath+0x16/0x1b
dev is null for eth1
dev is null for eth2
dev is null for eth3
dev is null for eth4
dev is null for eth5
dev is null for eth6
dev is null for eth7
dev is null for eth8
dev is null for eth9

Machine has only one network interface eth0.