systemd：从 systemctl 挂起恢复

Question

我有一个自定义的 systemd “.service” 文件，如下所示：

[Unit]
Description=MyStuff
After=syslog.target
After=network.target
After=local-fs.target
After=remote-fs.target

[Service]
Type=simple
User=root
Group=root
ExecStart=/usr/local/MyStuff/start
ExecReload=/bin/kill $MAINPID && /usr/bin/cat /var/run/MyStuff.pid | /usr/bin/xargs --no-run-if-empty /bin/kill
ExecStop=/bin/kill $MAINPID && /usr/bin/cat /var/run/MyStuff.pid | /usr/bin/xargs --no-run-if-empty /bin/kill
ExecStartPost=/usr/local/MyStuff/after_start.sh
PIDFile=/var/run/MyStuff.pid
#RemainAfterExit=yes
TimeoutSec=300
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target

直到几分钟前它都运行良好。Asystemctl stop MyStuff挂这样：

[root@Live-1 ffmpeg]# systemctl status WowzaStreamingEngine
? MyStuff.service - MyStuff
   Loaded: loaded (/usr/lib/systemd/system/MyStuff.service; enabled; vendor preset: disabled)
   Active: deactivating (final-sigkill) (Result: timeout) since vie 2017-07-28 11:12:23 -03; 23min ago
Main PID: 25149
CGroup: /system.slice/MyStuff.service

jul 28 11:12:23 Live-1 kill[10382]: kill: cannot find process "/usr/bin/cat"
jul 28 11:12:23 Live-1 kill[10382]: kill: cannot find process "/var/run/MyStuff.pid"
jul 28 11:12:23 Live-1 kill[10382]: kill: cannot find process "|"
jul 28 11:12:23 Live-1 kill[10382]: kill: cannot find process "/usr/bin/xargs"
jul 28 11:12:23 Live-1 kill[10382]: kill: cannot find process "--no-run-if-empty"
jul 28 11:12:23 Live-1 kill[10382]: kill: cannot find process "/bin/kill"
jul 28 11:12:23 Live-1 systemd[1]: MyStuff.service: control process exited, code=exited status=1
jul 28 11:17:24 Live-1 systemd[1]: MyStuff.service stop-sigterm timed out. Killing.
jul 28 11:22:24 Live-1 systemd[1]: MyStuff.service still around after SIGKILL. Ignoring.
jul 28 11:31:22 Live-1 systemd[1]: MyStuff.service stop-final-sigterm timed out. Killing.

我知道那里报告了错误。这不是问题；我不是在问这些错误。问题是：systemd/systemctl 挂在该状态，我无法执行启动/停止/重启操作，因为它们都一直在等待。

我需要知道的是绕过那个状态的方法。这次我只是重新启动了服务器，因为它是开发环境。但我不能在生产中就这样处理。

所以：当 systemd/systemctl 以这种方式挂起时，我该怎么做才能在不重新启动服务器的情况下从这种状态恢复我的服务？

提前致谢。