{"id":201,"date":"2015-04-27T13:29:47","date_gmt":"2015-04-27T13:29:47","guid":{"rendered":"http:\/\/betakb.veeble.org\/?p=201"},"modified":"2025-04-21T15:43:20","modified_gmt":"2025-04-21T10:13:20","slug":"zombie-processes","status":"publish","type":"post","link":"https:\/\/www.veeble.com\/kb\/zombie-processes\/","title":{"rendered":"Zombie processes"},"content":{"rendered":"\n<p>While checking the process list, you might have noticed something like this : <b>sh &lt;defunct&gt;<\/b>. These are <b><a href=\"https:\/\/en.wikipedia.org\/wiki\/Zombie_process#:~:text=On%20Unix%20and%20Unix%2Dlike,in%20the%20%22terminated%20state%22.\" target=\"_blank\" rel=\"noopener\">zombie processes<\/a><\/b>. On Unix operating systems, a zombie process or defunct process is a process that has completed execution but still has an entry in the process table, allowing the process that started it to read its exit status. It almost always means that the parent is still around. If the parent exited, the child would be orphaned and re-parented to init, which would immediately perform the wait(). In other words, they should go away once the parent process is done.<\/p>\n\n\n\n<p>These processes don&#8217;t react to signals.<\/p>\n\n\n\n<p>You can see a count of your zombie processes using the following script:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ps aux | awk '{ print $8 \" \" $2 }' | grep -w Z \n<\/pre>\n\n\n\n<p>In order to kill these processes, you need to find the parent process first.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">pstree -paul \n<\/pre>\n\n\n\n<p>This will show the pid of the parent of the zombie process. Now you need to kill the parent process.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">kill -9 &lt;pid&gt;\n<\/pre>\n\n\n\n<p>That&#8217;s it!<\/p>\n\n\n\n<div style=\"height:0px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-uagb-call-to-action uagb-block-29f738bb wp-block-button\"><div class=\"uagb-cta__wrap\"><h3 class=\"uagb-cta__title\">Powerful VPS Hosting, Without the Premium Price<\/h3><p class=\"uagb-cta__desc\">Get the performance you need at a price you&#8217;ll love. Explore our affordable VPS plans.<\/p><\/div><div class=\"uagb-cta__buttons\"><a href=\"https:\/\/www.veeble.com\/vps-hosting\/\" class=\"uagb-cta__button-link-wrapper wp-block-button__link\" target=\"_blank\" rel=\"noopener noreferrer\">See Pricing<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M504.3 273.6l-112.1 104c-6.992 6.484-17.18 8.218-25.94 4.406c-8.758-3.812-14.42-12.45-14.42-21.1L351.9 288H32C14.33 288 .0002 273.7 .0002 255.1S14.33 224 32 224h319.9l0-72c0-9.547 5.66-18.19 14.42-22c8.754-3.809 18.95-2.075 25.94 4.41l112.1 104C514.6 247.9 514.6 264.1 504.3 273.6z\"><\/path><\/svg><\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>While checking the process list, you might have noticed something like this : sh &lt;defunct&gt;. These are zombie processes. On Unix operating systems, a [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":8159,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[5],"tags":[],"class_list":["post-201","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux"],"uagb_featured_image_src":{"full":["https:\/\/www.veeble.com\/kb\/wp-content\/uploads\/2015\/04\/Zombie-processes.jpg",1366,768,false],"thumbnail":["https:\/\/www.veeble.com\/kb\/wp-content\/uploads\/2015\/04\/Zombie-processes-150x150.jpg",150,150,true],"medium":["https:\/\/www.veeble.com\/kb\/wp-content\/uploads\/2015\/04\/Zombie-processes-300x169.jpg",300,169,true],"medium_large":["https:\/\/www.veeble.com\/kb\/wp-content\/uploads\/2015\/04\/Zombie-processes-768x432.jpg",768,432,true],"large":["https:\/\/www.veeble.com\/kb\/wp-content\/uploads\/2015\/04\/Zombie-processes-1024x576.jpg",1024,576,true],"1536x1536":["https:\/\/www.veeble.com\/kb\/wp-content\/uploads\/2015\/04\/Zombie-processes.jpg",1366,768,false],"2048x2048":["https:\/\/www.veeble.com\/kb\/wp-content\/uploads\/2015\/04\/Zombie-processes.jpg",1366,768,false]},"uagb_author_info":{"display_name":"Vipin Raj","author_link":"https:\/\/www.veeble.com\/kb\/author\/vipin\/"},"uagb_comment_info":0,"uagb_excerpt":"While checking the process list, you might have noticed something like this : sh &lt;defunct&gt;. These are zombie processes. On Unix operating systems, a [&hellip;]","_links":{"self":[{"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/posts\/201","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/comments?post=201"}],"version-history":[{"count":6,"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/posts\/201\/revisions"}],"predecessor-version":[{"id":8642,"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/posts\/201\/revisions\/8642"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/media\/8159"}],"wp:attachment":[{"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/media?parent=201"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/categories?post=201"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.veeble.com\/kb\/wp-json\/wp\/v2\/tags?post=201"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}