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kill -9 <pid>
will not kill a zombie or defunct process
From what I came to know a zombie process doesn't react to signals because it's not really a process at all, it's just what's left over after it died.
It occurs because of programming error or bad programming.
This happens when a parent process invokes a child process and does not handle its exit properly. The zombie will go away if its parent dies.
So I think it will not cause huge issues?