You can verify if the zombie process is killed or not by running the ps command again or even the top command.Ĭongrats! Now you know how to eliminate zombie processes.
Here you get the parent process ID, so finally kill the process by typing the command line with its respective ID process obtained before. ps -o ppid= -p Īlternatively, you can combine the above two commands in the following fashion where it directly provides the PID of the zombie process and the PID of its parent process. Once you have identified its process ID, let’s get its parent’s process ID. You are asking to print all the matching lines where the state of a process starts with Z or z. The 8th column in the output of the ps aux command displays the state of a process.
It can be achieved by using the ps command like this in the terminal. So, first, let’s list the zombie processes to know their ID. That sounds brutal but that’s the only sure shot way of killing zombie processes. The other option to kill the zombie process is to kill its parent process. Some people suggests sending SIGCHLD signal to the parent process. You can burn your system for killing the zombie process but that’s not a feasible solution ) In the zombie movies, you shoot the zombies in the head or burn it. Here’s an excellent funny take on the zombie process by :Ī zombie process is already dead. fuser 80/tcp Then find the process name using PID number with the ps command like so. This is how zombie processes (also known as defunct processes) are created and stay in the system. You can find the process/service listening on a particular port by running the command below (specify the port). For the parent, the child still exists but the child process is actually dead. to find out the information that you are looking for. It is then possible to add a few more awk, cut, grep etc. This will list all the files opened by the process including the executables actual location. However, child process goes into zombie state if the parent process is not aware of its death. You can try something like below: lsof -p PROCESSID. When a child process dies, the parent process is informed so that it can do some clean up like freeing up memory etc. Processes also have their own child processes.ĭon’t believe me? Use the pstree command in terminal to look at the process tree to see the ‘family tree’ of your system’s processes. In Linux, except for the first init (or systemd) process with PID 0, every other process has a parent process. It can be a parent (creator of other processes during run-time) or child (process created by others) process. It can be foreground (interactive process) or background (not interactive or automatic process). In a few words, a process is a running instance of a program in performance. You also learn a thing or two about processes and zombie processes.īefore you learn about Zombie process, let me recall what is a process in Linux. Brief: This is a quick tip on finding zombie processes in Linux and then killing them.
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