What steps will reproduce the problem?
pid,err:= os.ForkExec("/bin/someinvalidcommand", nil, os.Environ(), 
"/home/Mike/workspace/domaintest", []*os.File{nil, nil, nil});

What is the expected output? What do you see instead?
Expected is that err will contain some kind of message like "invalid 
command". Instead, the program just hangs. 

What is your $GOOS?  $GOARCH?
linux/386

Which revision are you using?  (hg identify)
695a768153eb+ tip

Please provide any additional information below.