hm, this seems to have popped up in the last few days, never had it 
before:

  sysfs: duplicate filename 'eth0' can not be created
  WARNING: at fs/sysfs/dir.c:424 sysfs_add_one()

  Call Trace:
   [<ffffffff802de00a>] sysfs_add_one+0x54/0xbd
   [<ffffffff802dee61>] sysfs_create_link+0xc6/0x11d
   [<ffffffff8047c491>] device_rename+0x175/0x1d6
   [<ffffffff806180a6>] dev_change_name+0x118/0x211
   [<ffffffff8061893c>] dev_ioctl+0x4fa/0x5f8
   [<ffffffff8062eb11>] netlink_insert+0x13c/0x14b
   [<ffffffff806a877f>] do_page_fault+0x3eb/0x73f
   [<ffffffff8060b909>] sock_ioctl+0x1f2/0x200
   [<ffffffff802a5a5d>] do_ioctl+0x21/0x6b
   [<ffffffff802a5cea>] vfs_ioctl+0x243/0x25c
   [<ffffffff802a5d54>] sys_ioctl+0x51/0x71
   [<ffffffff8020c02e>] system_call+0x7e/0x83

   net eth0: device_rename: sysfs_create_symlink failed (-17)

32-bit bzImage kernel - config attached. (The 64-bit kernel even lost 
connectivity due to this and ifcfg-eth0 got renamed to ifcfg-eth0.bak by 
kudzu.)

detected order of the interfaces is:

  forcedeth 0000:00:0a.0: ifname eth0, PHY OUI 0x5043 @1
  eth1: RealTek RTL8139 at 0xffffc200001f2000

and that's the ordering in /etc/sysconfig/network-scripts as well.

	Ingo