{"id":11369,"date":"2018-06-26T15:37:09","date_gmt":"2018-06-26T13:37:09","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/kernel-panic-not-syncing-out-of-memory-and-no-killable-processes\/"},"modified":"2018-06-26T15:37:09","modified_gmt":"2018-06-26T13:37:09","slug":"kernel-panic-not-syncing-out-of-memory-and-no-killable-processes","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/kernel-panic-not-syncing-out-of-memory-and-no-killable-processes\/","title":{"rendered":"Kernel panic &#8211; not syncing: Out of memory and no killable processes"},"content":{"rendered":"<h2>By Franck Pachot<\/h2>\n<p>.<br \/>\nThis is a quick post to give a solution (maybe not the best one as this was just quick troubleshooting) if, at boot, you see something like:<\/p>\n<pre><code>Trying to allocate 1041 pages for VMLINUZ [Linux=EFI, setup=0x111f, size=0x41108d01]<\/code><\/pre>\n<p>and then:<\/p>\n<pre><code>Kernel panic - not syncing: Out of memory and no killable processes\nPid: 1228 comm: kworker Not tainted 3.8.13-118.17.4.el6uek.x86_64 #2<\/code><\/pre>\n<p><!--more--><br \/>\n<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/IMG_E5543.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/IMG_E5543.jpg\" alt=\"IMG_E5543\" width=\"225\" height=\"300\" class=\"alignright size-medium wp-image-24599\" \/><\/a><br \/>\nIf you do not see the messages, then you may need to remove the &#8216;quiet&#8217; option of kernel and replace it by &#8216;nosplash&#8217; &#8211; this is done from grub.<\/p>\n<p>So, there&#8217;s not enough memory to start the kernel. I got this from a server that had been shut down to be moved to another data center, so at first, I checked that the RAM was ok. Actually, the problem was with the configuration of hugepages (vm.nr_hugepages in \/etc\/sysctl.conf) which was allocating nearly the whole RAM. Probably because the setting has been erroneously changed without checking \/proc\/meminfo.<\/p>\n<p>So, without any clue about what the problem was, I started by forcing the kernel to use 4GB (instead of getting it from hardware info). This is done by pressing any key on the GRUB menu, &#8216;e&#8217; to edit, add the &#8216;mem=4g&#8217;. Then the boot was ok. Of course, if the server tries to start the Oracle instances, the systems starts to swap so better change also the runlevel.<\/p>\n<p>This is sufficient to check the huge pages allocation and ensure that you leave enough memory for at least the kernel (but also consider also the system, the PGA, &#8230;). So don&#8217;t forget that the mem= option, usually there to give a maximum limit, may be useful also to guarantee a minimum of RAM for the kernel.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>By Franck Pachot . This is a quick post to give a solution (maybe not the best one as this was just quick troubleshooting) if, at boot, you see something like: Trying to allocate 1041 pages for VMLINUZ [Linux=EFI, setup=0x111f, size=0x41108d01] and then: Kernel panic &#8211; not syncing: Out of memory and no killable processes [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":11370,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[42,59],"tags":[1382,1383,425,1325],"type_dbi":[],"class_list":["post-11369","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-operating-systems","category-oracle","tag-hugepages","tag-kernel","tag-memory","tag-oel"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Kernel panic - not syncing: Out of memory and no killable processes - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/kernel-panic-not-syncing-out-of-memory-and-no-killable-processes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kernel panic - not syncing: Out of memory and no killable processes\" \/>\n<meta property=\"og:description\" content=\"By Franck Pachot . This is a quick post to give a solution (maybe not the best one as this was just quick troubleshooting) if, at boot, you see something like: Trying to allocate 1041 pages for VMLINUZ [Linux=EFI, setup=0x111f, size=0x41108d01] and then: Kernel panic - not syncing: Out of memory and no killable processes [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/kernel-panic-not-syncing-out-of-memory-and-no-killable-processes\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2018-06-26T13:37:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/IMG_E5543.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1484\" \/>\n\t<meta property=\"og:image:height\" content=\"1980\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Oracle Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Oracle Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/kernel-panic-not-syncing-out-of-memory-and-no-killable-processes\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/kernel-panic-not-syncing-out-of-memory-and-no-killable-processes\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"Kernel panic &#8211; 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