When two Cbenches with throughput mode stress the arphandlers on the clustered controllers (i.e., ctrl1-master, ctrl2-slave), respectively, one of the controllers freezes and "Unable to acquire lock after [10 seconds] on key" exception is thrown.

To reproduce, I use
./run.sh -Xmx10G -Xms5G -XX:NewRatio=5 -XX:+UseG1GC -XX:MaxPermSize=256m -Dsupernodes=ctrl1:ctrl2:ctrl3

./cbench -c ctrl1 -m 10000 -M 100000 -o 0 -t
./cbench -c ctrl2 -m 10000 -M 100000 -o 50 -t

Further, I have attached the log file.