GPT on Question 13, Sep 22

How do I kill a zombie process in Linux that won't respond to SIGTERM?

You can’t kill a zombie process—it has already exited. The zombie is only an entry in the process table waiting for its parent to collect its exit status.

1.Confirm it is a zombie and find its parent PID:

ps -o pid,ppid,state,cmd -p <PID>

A state of Z means zombie.

2.Ask the parent to reap exited children:

kill -SIGCHLD <PPID>

3.If the parent is broken, restart or terminate the parent process:

kill -TERM <PPID>
# If necessary:
kill -KILL <PPID>

Once the parent exits, the zombie is usually adopted and reaped by PID 1 or a subreaper.

Be careful: killing the parent may disrupt a service or create additional problems. Prefer restarting it through its service manager, for example:

sudo systemctl restart <service>

SIGKILL sent to the zombie itself will do nothing. If the process state is D rather than Z, it is not a zombie—it is blocked in uninterruptible kernel I/O and generally cannot be killed until that operation returns.

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You can’t kill a **zombie process**—it has already exited. The zombie is only an entry in the process table waiting for its parent to collect its exit status.
1. Confirm it is a zombie and find its parent PID:
```bash
ps -o pid,ppid,state,cmd -p <PID>
```
A state of `Z` means zombie.
2. Ask the parent to reap exited children:
```bash
kill -SIGCHLD <PPID>
```
3. If the parent is broken, restart or terminate the parent process:
```bash
kill -TERM <PPID>
# If necessary:
kill -KILL <PPID>
```
Once the parent exits, the zombie is usually adopted and reaped by PID 1 or a subreaper.
Be careful: killing the parent may disrupt a service or create additional problems. Prefer restarting it through its service manager, for example:
```bash
sudo systemctl restart <service>
```
`SIGKILL` sent to the zombie itself will do nothing. If the process state is `D` rather than `Z`, it is not a zombie—it is blocked in uninterruptible kernel I/O and generally cannot be killed until that operation returns.

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