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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-15418] Signal to dump non-mapped memory</title>
                <link>https://jira.mongodb.org/browse/SERVER-15418</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We need (Linux terminology is used in this ticket) a way to dump core that does not include the memory mapped files.  This will become more critical as we move to better (and therefore complicated) algorithms where examining memory will yield information we cannot otherwise access and speed up the diagnostic process.&lt;/p&gt;

&lt;p&gt;Having a core dump is the only way to have a historical record of a process state.&lt;/p&gt;

&lt;p&gt;Currently this isn&apos;t possible as all signals are caught.&lt;/p&gt;

&lt;p&gt;Having this internal to mongo such that development programs aren&apos;t installed would be ideal.&lt;/p&gt;</description>
                <environment></environment>
        <key id="160466">SERVER-15418</key>
            <summary>Signal to dump non-mapped memory</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="charlie.page@10gen.com">Charlie Page</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Sep 2014 15:13:12 +0000</created>
                <updated>Thu, 25 Jun 2015 18:36:35 +0000</updated>
                            <resolved>Fri, 26 Sep 2014 16:47:01 +0000</resolved>
                                                                    <component>Diagnostics</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="728239" author="james.wahlin@10gen.com" created="Fri, 26 Sep 2014 17:38:47 +0000"  >&lt;p&gt;gcore and gdb don&apos;t respect &lt;tt&gt;/proc/PID/coredump_filter&lt;/tt&gt; settings. They use the same underlying mechanism to dump memory and do not provide a way to skip dumping file-mapped memory space. (See &lt;a href=&quot;https://sourceware.org/bugzilla/show_bug.cgi?id=16092&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://sourceware.org/bugzilla/show_bug.cgi?id=16092&lt;/a&gt;)&lt;/p&gt;</comment>
                            <comment id="728186" author="schwerin" created="Fri, 26 Sep 2014 16:47:01 +0000"  >&lt;p&gt;OS tools exist for this purpose.&lt;/p&gt;</comment>
                            <comment id="728173" author="matt.kangas@10gen.com" created="Fri, 26 Sep 2014 16:34:56 +0000"  >&lt;p&gt;It is possible today to trigger core dumps of MongoDB on Linux by running &quot;gcore&quot; or &quot;gdb&quot;.&lt;/p&gt;

&lt;p&gt;These dumps do not include memory mapped files by default. You can control this via /proc/PID/coredump_filter. For example, on my Ubuntu 12.04 box:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ cat /proc/self/coredump_filter&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;00000023&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           bit 0  Dump anonymous private mappings.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           bit 1  Dump anonymous shared mappings.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           bit 5 (since Linux 2.6.28)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                  Dump private huge pages.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Notably bits 2 and 3 are off, those control file-backed mappings. See &quot;man core&quot; for details.&lt;/p&gt;

&lt;p&gt;Cross-platform, the story is more tricky Are you looking for something along the lines of &lt;a href=&quot;https://code.google.com/p/google-breakpad/wiki/GettingStartedWithBreakpad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Google Breakpad&lt;/a&gt;, which produces Windows-format minidumps on all supported platforms?&lt;/p&gt;</comment>
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