{"id":3237,"date":"2015-05-12T10:46:43","date_gmt":"2015-05-12T01:46:43","guid":{"rendered":"https:\/\/www.pistolfly.com\/weblog\/?p=3237"},"modified":"2020-11-14T09:40:57","modified_gmt":"2020-11-14T00:40:57","slug":"core-dump-is-not-generated-on-ubuntu-in-some-cases","status":"publish","type":"post","link":"https:\/\/www.pistolfly.com\/weblog\/en\/2015\/05\/core-dump-is-not-generated-on-ubuntu-in-some-cases.html","title":{"rendered":"Core dump is not generated on Ubuntu in some cases"},"content":{"rendered":"<p>Core dump is not generated on Ubuntu(14.04 LTS) in some cases.<br \/>\nSometimes it can be generated. It seems to depend on the program.<\/p>\n<p>Like below ulimit is OK.<\/p>\n<pre class=\"command-line\">$ ulimit -c unlimited\r\n$ ulimit -a\r\ncore file size          (blocks, -c) unlimited\r\ndata seg size           (kbytes, -d) unlimited\r\nscheduling priority             (-e) 0\r\nfile size               (blocks, -f) unlimited\r\npending signals                 (-i) 15739\r\nmax locked memory       (kbytes, -l) 64\r\nmax memory size         (kbytes, -m) unlimited\r\nopen files                      (-n) 1024\r\npipe size            (512 bytes, -p) 8\r\nPOSIX message queues     (bytes, -q) 819200\r\nreal-time priority              (-r) 0\r\nstack size              (kbytes, -s) 8192\r\ncpu time               (seconds, -t) unlimited\r\nmax user processes              (-u) 15739\r\nvirtual memory          (kbytes, -v) unlimited\r\nfile locks                      (-x) unlimited\r\n<\/pre>\n<p>I examined where the core dump is generated.<\/p>\n<pre class=\"command-line\">$ sudo sysctl -a | grep core_pattern\r\nkernel.core_pattern = |\/usr\/share\/apport\/apport %p %s %c %P\r\n<\/pre>\n<p>On Ubuntu(14.04 LTS) core_pattern uses apport by default.<\/p>\n<p>In case core dump was successfully generated, core dump was generated in current directory.<br \/>\nIn case core dump was not generated, an error occurred on apport.<\/p>\n<p>\/var\/log\/apport.log<\/p>\n<pre class=\"command-line\">ERROR: apport (pid 3480) Tue May 12 18:48:31 2015: called for pid 3479, signal 6, core limit 18446744073709551615\r\nERROR: apport (pid 3480) Tue May 12 18:48:31 2015: ignoring implausibly big core limit, treating as unlimited\r\nERROR: ERROR: apport (pid 3480) Tue May 12 18:48:31 2015: Unhandled exception:\r\nTraceback (most recent call last):\r\n  File \"\/usr\/share\/apport\/apport\", line 357, in &lt;module&gt;\r\n    (info['ExecutablePath'], info['ProcCmdline']))\r\n  File \"\/usr\/share\/apport\/apport\", line 99, in error_log\r\n    apport.error('apport (pid %s) %s: %s', os.getpid(), time.asctime(), msg)\r\n  File \"\/usr\/lib\/python3\/dist-packages\/apport\/__init__.py\", line 44, in error\r\n    sys.stderr.write(msg % args)\r\nUnicodeEncodeError: 'ascii' codec can't encode character '\\ufffd' in position 143: ordinal not in range(128)\r\nERROR: apport (pid 3480) Tue May 12 18:48:31 2015: pid: 3480, uid: 0, gid: 0, euid: 0, egid: 0\r\nERROR: apport (pid 3480) Tue May 12 18:48:31 2015: environment: environ({})\r\n<\/pre>\n<p>Because an error occurred on apport, core dump was not generated.<br \/>\nThis error seems to be Python's UnicodeEncodeError but I'm not sure, so I decided not to use apport in core_pattern.<\/p>\n<pre class=\"command-line\"># echo 'core.%e.%p' &gt; \/proc\/sys\/kernel\/core_pattern\r\n<\/pre>\n<pre class=\"command-line\">$ ulimit -c unlimited\r\n$ cat segfault.c\r\n#include &lt;stdio.h&gt;\r\n\r\nint main(void)\r\n{\r\n  char *s = \"hello, world!\";\r\n  *s = 'H';\r\n\r\n  return 0;\r\n}\r\n$ gcc -Wall -g -o segfault segfault.c\r\n$ .\/segfault \r\nSegmentation fault (core dumped)\r\n$ ls\r\ncore.segfault.3423  segfault  segfault.c\r\n<\/pre>\n<p>Any configuration changes made using the echo command disappear when the system is restarted.<br \/>\nTo make configuration changes take effect after the system is rebooted, edit \/etc\/sysctl.conf.<\/p>\n<p>Source: <em><a href=\"https:\/\/access.redhat.com\/documentation\/en-US\/Red_Hat_Enterprise_Linux\/6\/html\/Deployment_Guide\/s1-proc-sysctl.html\" target=\"_blank\" rel=\"noopener noreferrer\">E.4. Using the sysctl Command<\/a><\/em><\/p>\n<p>\/etc\/sysctl.conf<\/p>\n<pre>kernel.core_pattern = core.%e.%p\r\n<\/pre>\n<p>But when the system is restarted, changes disappear and core_pattern uses apport.<br \/>\nWhen the system is restarted and apport starts, apport seems to overwrite configuration.<\/p>\n<p>Source: <em><a href=\"http:\/\/askubuntu.com\/questions\/420410\/how-to-permanently-edit-the-core-pattern-file\" target=\"_blank\" rel=\"noopener noreferrer\">12.04 - How to permanently edit the core_pattern file? - Ask Ubuntu<\/a><\/em><\/p>\n<p>To stop this behavior, disable apport and restart the system.<\/p>\n<p>\/etc\/default\/apport<\/p>\n<pre># set this to 0 to disable apport, or to 1 to enable it\r\n# you can temporarily override this with\r\n# sudo service apport start force_start=1\r\n#enabled=1\r\nenabled=0\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Core dump is not generated on Ubuntu(14.04 LTS) in some cases. Sometimes it can be generated. It seems to depe &hellip; <a href=\"https:\/\/www.pistolfly.com\/weblog\/en\/2015\/05\/core-dump-is-not-generated-on-ubuntu-in-some-cases.html\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Core dump is not generated on Ubuntu in some cases<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"2969","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[53,6],"tags":[],"class_list":["post-3237","post","type-post","status-publish","format-standard","hentry","category-c","category-linux","en-US"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Core dump is not generated on Ubuntu in some cases - Pistolfly<\/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.pistolfly.com\/weblog\/en\/2015\/05\/core-dump-is-not-generated-on-ubuntu-in-some-cases.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Core dump is not generated on Ubuntu in some cases - Pistolfly\" \/>\n<meta property=\"og:description\" content=\"Core dump is not generated on Ubuntu(14.04 LTS) in some cases. 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