You are sure it's your miner that found the block (I'm not familiar with if that message says you found the block or someone else did)?
There's something screwy going on because your bitcoind is offering transaction based work just before you found the block of 910k Perhaps for whatever reason your p2pool client kept building empty block work indefinitely after the previous block through some bug. Is your p2pool code modified in any way?
Yup. Positive it was it. I have logs from miner as well. The p2pool node is not modified other than the front-end. The miner is an S7, and I have found valid blocks with tx in the block before. I was running bitcoin core 0.12 at the time.