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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-71544] Race condition on _sessionCatalogSource in LogOpShardingHandler::commit</title>
                <link>https://jira.mongodb.org/browse/SERVER-71544</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The LogOpShardingHandler::commit method checks if the _sessionCatalogSource&lt;br/&gt;
&#160;member from the `MigrationChunkClonerSourceLegacy` class is constructed, but that member may be in the process of being constructed (via the MigrationChunkClonerSourceLegacy::startClone method). This is a race condition because the check may succeed because the memory address for _sessionCatalogSource has some data written, but not all of the data may have been finished being written, so using it would be unsafe.&lt;/p&gt;

&lt;p&gt;Note that other methods in MigrationChunkClonerSource that do a similar check for if the sessionCatalgSource exists are not racy because they are assumed to be running after startClone is ran (which is the only method that constructs the _sessionCatalogSource).&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2192149">SERVER-71544</key>
            <summary>Race condition on _sessionCatalogSource in LogOpShardingHandler::commit</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="wenqin.ye@mongodb.com">Wenqin Ye</assignee>
                                    <reporter username="wenqin.ye@mongodb.com">Wenqin Ye</reporter>
                        <labels>
                            <label>sharding-nyc-subteam2</label>
                    </labels>
                <created>Tue, 22 Nov 2022 16:10:47 +0000</created>
                <updated>Sun, 29 Oct 2023 21:30:13 +0000</updated>
                            <resolved>Tue, 29 Nov 2022 17:14:40 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5013319" author="xgen-internal-githook" created="Mon, 28 Nov 2022 23:05:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;wenqinYe&apos;, &apos;email&apos;: &apos;wenqin908@gmail.com&apos;, &apos;username&apos;: &apos;wenqinYe&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71544&quot; title=&quot;Race condition on _sessionCatalogSource in LogOpShardingHandler::commit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71544&quot;&gt;&lt;del&gt;SERVER-71544&lt;/del&gt;&lt;/a&gt; Fix race condition on _sessionCatalogSource in LogOpShardingHandler::commit&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ee8a38cc92b5ff1e39ff2e702a17e25d29280409&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ee8a38cc92b5ff1e39ff2e702a17e25d29280409&lt;/a&gt;&lt;/p&gt;</comment>
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