GDAX is doing what now???

From the official GDAX blog seen here, GDAX is planning on crediting accounts that had margin calls or stop loss orders executed during the recent flash crash.

from the article

We will establish a process to credit customer accounts which experienced a margin call or stop loss order executed on the GDAX ETH-USD order book as a direct result of the rapid price movement at 12.30pm PT on June 21, 2017.