[process]linux: porcess was not started.

process/process_posix.go

@@ -74,6 +74,9 @@ func (p *Process) SendSignal(sig syscall.Signal) error {
 	}
 	cmd := exec.Command(kill, "-s", sigAsStr, strconv.Itoa(int(p.Pid)))
 	cmd.Stderr = os.Stderr
+	if err := cmd.Start(); err != nil {
+		return err
+	}
 	err = common.WaitTimeout(cmd, common.Timeout)
 	if err != nil {
 		return err