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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-19817] mongod crash &quot;cannot allocate memory&quot; during aggregate</title>
                <link>https://jira.mongodb.org/browse/SERVER-19817</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While reading data from a sharded db (within an aggregate), mongod crashes with the following message :&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;
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					&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;2015-08-07T11:21:08.540+0200 E STORAGE  [conn2135] WiredTiger (12) [1438939268:540151][8073:0x7f07fb4f7700], connection.open_session: only configure&lt;/span&gt;&lt;/pre&gt;
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						&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;d to support 20010 sessions (including 10 internal): Cannot allocate memory&lt;/span&gt;&lt;/pre&gt;
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						&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;2015-08-07T11:21:08.540+0200 I -        [conn2135] Invariant failure: ret resulted in status UnknownError 12: Cannot allocate memory at src/mongo/db&lt;/span&gt;&lt;/pre&gt;
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					&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;/storage/wiredtiger/wiredtiger_session_cache.cpp 49&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;(Full log extract around the crash attached)&lt;/p&gt;</description>
                <environment></environment>
        <key id="224596">SERVER-19817</key>
            <summary>mongod crash &quot;cannot allocate memory&quot; during aggregate</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="rj-10gen@arsynet.com">Remi Jolin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Aug 2015 09:56:29 +0000</created>
                <updated>Fri, 7 Aug 2015 13:16:50 +0000</updated>
                            <resolved>Fri, 7 Aug 2015 13:16:50 +0000</resolved>
                                    <version>3.0.4</version>
                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="999293" author="ramon.fernandez" created="Fri, 7 Aug 2015 13:16:12 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rj-10gen%40arsynet.com&quot; class=&quot;user-hover&quot; rel=&quot;rj-10gen@arsynet.com&quot;&gt;rj-10gen@arsynet.com&lt;/a&gt;, the error message and stack trace seem to indicate this is a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17364&quot; title=&quot;Idle cursors shouldn&amp;#39;t hold storage engine resources&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17364&quot;&gt;&lt;del&gt;SERVER-17364&lt;/del&gt;&lt;/a&gt;, which was fixed in the 3.0.5 stable version as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17386&quot; title=&quot;Cursor cache causes excessive memory utilization in WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17386&quot;&gt;&lt;del&gt;SERVER-17386&lt;/del&gt;&lt;/a&gt;. You can see a &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19273?focusedCommentId=992396&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-992396&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;more detailed explanation with workarounds here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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