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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-35527] Ignore session information on the embedded version of mongod</title>
                <link>https://jira.mongodb.org/browse/SERVER-35527</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When requests with a session id are parsed, the id is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1c21898e28/src/mongo/db/initialize_operation_session_info.cpp#L69-L70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;vivified in the LogicalSessionCache decoration&lt;/a&gt;. The embedded storage engine does not set up the LogicalSessionCache (the decoration is a null pointer), so sending a session id to &lt;tt&gt;mongoed&lt;/tt&gt; triggers a segmentation fault when &lt;tt&gt;LogicalSessionCache::vivify&lt;/tt&gt; is called.&lt;/p&gt;

&lt;p&gt;Since session based behavior can&apos;t work without the cache, any session information received when there is no LogicalSessionCache should just be ignored, avoiding the crash.&lt;/p&gt;

&lt;p&gt;This is a required change for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32064&quot; title=&quot;A logical session id should be included in all command requests from the mongo shell&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32064&quot;&gt;&lt;del&gt;SERVER-32064&lt;/del&gt;&lt;/a&gt;, which will change the shell to use implicit sessions, meaning (almost) every request will have a session id. Alternatively, the shell could check the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1c21898e28/src/mongo/client/dbclient_connection.cpp#L206&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;isMaster response it receives when creating a connection&lt;/a&gt;&#160;and choose not to send session ids when sessions aren&apos;t supported (&lt;a href=&quot;https://github.com/mongodb/specifications/blob/356e1f2/source/sessions/driver-sessions.rst#how-to-check-whether-a-deployment-supports-sessions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;like what drivers do&lt;/a&gt;), but this would require more work and could be done as a follow-up or as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33606&quot; title=&quot;mongo shell startSession() should fail if the server doesn&amp;#39;t support logical sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33606&quot;&gt;&lt;del&gt;SERVER-33606&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="557406">SERVER-35527</key>
            <summary>Ignore session information on the embedded version of mongod</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="13201">Fixed</resolution>
                                        <assignee username="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Jun 2018 14:54:24 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:53 +0000</updated>
                            <resolved>Mon, 11 Jun 2018 21:16:54 +0000</resolved>
                                                    <fixVersion>4.0.0-rc5</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1917674" author="xgen-internal-githook" created="Mon, 11 Jun 2018 21:47:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jsmulrow&apos;, &apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35527&quot; title=&quot;Ignore session information on the embedded version of mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35527&quot;&gt;&lt;del&gt;SERVER-35527&lt;/del&gt;&lt;/a&gt; Ignore session information on the embedded version of mongod&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 7070ff68a75f10a906c0b0cdbbf50697ec1372c2)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/43c2f1b3564c4ea6a342525052a814c9fa98b946&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/43c2f1b3564c4ea6a342525052a814c9fa98b946&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1917584" author="xgen-internal-githook" created="Mon, 11 Jun 2018 21:16:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jsmulrow&apos;, &apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35527&quot; title=&quot;Ignore session information on the embedded version of mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35527&quot;&gt;&lt;del&gt;SERVER-35527&lt;/del&gt;&lt;/a&gt; Ignore session information on the embedded version of mongod&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7070ff68a75f10a906c0b0cdbbf50697ec1372c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7070ff68a75f10a906c0b0cdbbf50697ec1372c2&lt;/a&gt;&lt;/p&gt;</comment>
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