When removing blocks(e.g. RDD, broadcast, shuffle), BlockManagerMaserEndpoint will make RPC calls to each known BlockManagerSlaveEndpoint to remove the specific blocks. The PRC call sometimes could end in a timeout when the executor has been lost, but only notified the BlockManagerMasterEndpoint after the removing call has already happened. The timeout could therefore fail the whole query.
In this case, we actually could just ignore the error since those blocks on the lost executor could be considered as removed already.