zombie-process

I have some troubles with Python child processes so I wrote a very simple script: import os import sys import time pid = os.fork() if pid: #parent time.sleep(30) else: #child #os._exit(0) sys.exit() While parent process is sleeping I launch ps fax | grep py[t]hon And I read this output 2577 ? S 0:00 python /home/pi/python/GPIO/GPIODaemon.py restart 2583 ? Z 0:00 \_ [python] <defunct> Using sys.exit() or os._exit(0) there is always a Zombie process and I'm unable to understand why. Working on my more complex code I was thinking that there was some resources that child processes were keeping

I'm writing an application that needed a MSWord document parser. I'm using Microsoft.Office.Interop.Word.Document to extract the texts from the documents, but even if i use doc.Close() the document, from taskManager i can see that winword.exe are not killed, and after parsing a couple dozens documents it eats up some much resources. is close() the wrong method? please help me and point me to the right direction on how to terminate these processes properly. =) ~~~update~~~ Thanks for all the help. I use the app.quit() and also ran a loop that checks for the process and problem solved! =) Are

Is there a way to kill a zombie process? I've tried calling exit to kill the process and even sending SIGINT signal to the process, but it seems that nothing can kill it. I'm programming for Linux. Zombie processes are already dead, so they cannot be killed, they can only be reaped, which has to be done by their parent process via wait*() . This is usually called the child reaper idiom, in the signal handler for SIGCHLD : while (wait*(... WNOHANG ...)) { ... } Here is a script I created to kill ALL zombie processes. It uses the GDB debugger to attach to the parent process and send a waitpid to

I've seen bits of scattered information all around, but I can't seem to get to one final answer. How do you clean up a zombie thread in kernel? Just to make sure, and produce a final correct way of handling threads in kernel, I would like to ask this question more broadly. How do you create, terminate and clean up a thread in the Linux kernel? What I have so far is this: thread_func: exited = 0; while (!must_exit) do stuff exited = 1; do_exit(0) init_module: must_exit = 0; exited = 1; kthread_run(thread_func, ...) /* creates and runs the thread */ cleanup_module: must_exit = 1; while (!exited)

After I have played around for some time using R's parallel package on my Debian-based machine I still can't find a way to remove all zombie child-processes after a computation. I'm searching for a general and OS independent solution. Below a simple script illustrating the problem for 2 cores: library(parallel) testfun <- function(){TRUE} cltype <- ifelse(.Platform$OS.type != "windows", "FORK", "PSOCK") cl <- makeCluster(2, type = cltype) p <- clusterCall(cl, testfun) stopCluster(cl) Unfortunately, this script leaves two zombie processes in the process table which only get killed if R is shut

Wikipedia says "A child process that terminates but is never waited on by its parent becomes a zombie process." I run this program: #include <stdio.h> #include <unistd.h> #include <stdlib.h> int main() { pid_t pid, ppid; printf("Hello World1\n"); pid=fork(); if(pid==0) { exit(0); } else { while(1) { printf("I am the parent\n"); printf("The PID of parent is %d\n",getpid()); printf("The PID of parent of parent is %d\n",getppid()); sleep(2); } } } This creates a zombie process, but I can't understand why a zombie process is created here? The output of the program is Hello World1 I am the parent

first thing first. my system info and versions: $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 13.04 Release: 13.04 Codename: raring $ sudo docker version Client version: 0.9.0 Go version (client): go1.2.1 Git commit (client): 2b3fdf2 Server version: 0.9.0 Git commit (server): 2b3fdf2 Go version (server): go1.2.1 $ lxc-version lxc version: 0.9.0 $ uname -a Linux ip-10-0-2-86 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux I am not able to stop a container after the process inside of it becomes a zombie.