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"reboot" or "shutdown" commands are executed daemons are gracefully stopped and storage volumes unmounted. This is usually accomplished via scripts in the /etc/init.d directory which will wait for each daemon to shut down gracefully before proceeding on to the next one. That environment triggers dead-lock situation when one of the daemons are not closing gracefully. To force the kernel to reboot the system will be making use of the magic SysRq key. 

The magic_SysRq_key provides a means to send low level instructions directly to the kernel via the /proc virtual file system.


adding an additional parameter "-f"

Code Block
reboot -f