Os Process Zombie

In this tutorial, you'll learn about How to Fix Zombie Process Errors. We cover key concepts, practical examples, and best practices.

Fix zombie process errors when child exits but parent ignores SIGCHLD without wait causing zombie.

Quick Fix

Wrong

import os
pid=os.fork()
if pid==0:
    print('Child exiting'); os._exit(0)
else:
    import time; time.sleep(10)  # No wait!

Child exits but parent busy. Child becomes zombie (visible in ps as 'defunct'). Process table slot wasted.

Right

import os
pid=os.fork()
if pid==0:
    print('Child exiting'); os._exit(0)
else:
    pid, status = os.wait()  # reaps child
    print(f'Child {pid} reaped')

Child reaped immediately. No zombie. Exit status available.

Prevention

Always wait() for child processes. Or use SIGCHLD handler with waitpid(). Check ps output for zombies.

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