When using the sky2 driver for Marvell Ethernet adapters with the following device:
Ethernet controller: Marvell Technology Group Ltd.
88E8052 PCI-E ASF Gigabit Ethernet Controller (rev 20)
packet transmission may time out with the following message being written to netconsole:
sky2 eth1: tx timeout
This is a known issue: after receiving these messages, the system must be rebooted in order to fix the packet transmission issues. (BZ#614559)