miner - the client has been shutdown

[tuxcanfly]

Sometimes the miner rpc client has an unexpected shutdown which leads to a panic. Trying to find out the conditions to repro this..

2014/10/13 15:34:40 miner: Cannot stop mining: the client has been shutdown
panic: runtime error: close of closed channel

goroutine 99 [running]:
runtime.panic(0x9018a0, 0xd52335)
        /usr/local/go/src/pkg/runtime/panic.c:279 +0xf5
main.(*Communication).Communicate(0xc20802a620, 0xc2080e3b00, 0xc208120090, 0xc2080e3b30, 0x5, 0x5)
        /home/tuxcanfly/Work/conformal/src/github.com/conformal/btcsim/comm.go:420 +0xed
created by main.(*Communication).Start
        /home/tuxcanfly/Work/conformal/src/github.com/conformal/btcsim/comm.go:141 +0x5e0