Crash in Sorter: "Check failed: resources.contains(slaveId)"

We've hit a similar exception on 3 different versions of the Mesos master (the line #/file name changes but the Check failed is the same), usually when under very high load:

F1003 22:06:54.463502  8579 sorter.hpp:339] Check failed: resources.contains(slaveId)

This particular occurrence happened after the election of a new master that was then stuck doing framework update broadcasts, as documented in MESOS-10005.