On Mon, Feb 28, Michael Chan wrote:

The 5704S changes in 2.6.11-rc4 are mainly related to serdes link-up and tx
signal. I don't see how those changes can cause a hang or the tg3_stop_block
error. The stack trace did not show any tg3 function calls. Can you narrow it
down further to a specific patch that is causing the problem?

The blades are currently busy with other testing for the rest of the
week. I ran 2.6.11-rc kernels since a while and it did not happen until
very recently.