How to kill a process in Linux if kill -9 has no effect | signal 30 (SIGPWR)

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You have to reboot the machine. If kill -9 doesn't kill a process, that means it is stuck in the kernel. Unless you can figure out what it's stuck on and unstick it, there's nothing you can do. The reason it's stuck is that it is waiting for something and the logic necessary to cleanly stop waiting simply doesn't exist.

 A zombie process shouldn't be able to occupy ports. When the process terminates, all its file descriptors should be closed even before it's reaped.

 Every time I have a job that is stuck and signals 9 or 15 won't kill it, I send it signal 30 (SIGPWR) and almost every single time it will clear it out. 





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