Comment # 37 on bug 1044294 from Johannes Thumshirn

(In reply to Holger Schranz from comment #35)
> Hi Johannes,
> 
> about this issue I have try to find an easy method to recreate and now I
> think I have found it:
> 
> Use the ethtool and change the settings. Each usage of the ethtool to the
> FCoE used interfaces run into this problem.
> 
> An example:
> eth2/eth3 are assign to FCoE
> 
> ethtool -s eth2 autoneg off speed 100 duplex full
> 
> and the problem occure
> 
> Best regards
> 
> Holger

Just for confirmation, did you try the kernel from comment 31?