Summary: It is possible for blockingWait to crash if just after it leaves it's drive() method in the destructor, from another thread something releases the keep alive. If then the destructor continues it will clean up, but that other thread will then be manipulating freed data.

Reviewed By: andriigrynenko

Differential Revision: D19860616

fbshipit-source-id: 25df16b5e900f283bbc0a264233770b6d3667ba3