Stack overflow in receive daemon when doing parfib_dist of 30 1 1

[Ryan Newton]

The title says it all:

 [distmeta_M ThreadId 6] [rcvdmn] RUNNING STOLEN PAR WORK 
Exception inside child thread "Daemon thread (ReceiveDaemon)": stack overflow
Stack space overflow: current size 8388608 bytes.
Use `+RTS -Ksize -RTS' to increase it.
Exception inside runParDist: thread blocked indefinitely in an MVar operation
parfib_dist.exe: thread blocked indefinitely in an MVar operation

This is as of 2644cde.