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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-40301] Don&apos;t access the filesystem under std::mutex in the chunk cloner&apos;s nextCloneBatch()</title>
                <link>https://jira.mongodb.org/browse/SERVER-40301</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Accessing the filesystem under a std::mutex can cause deadlocks. When &lt;b&gt;retrieving the next clone batch&lt;/b&gt; in the migration cloner source, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dc747812eec3cff55b8a94d34eea80a97bbb8b6f/src/mongo/db/s/migration_chunk_cloner_source_legacy.cpp#L531&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;check if each document still exists in the storage subsystem&lt;/a&gt;. This is done &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dc747812eec3cff55b8a94d34eea80a97bbb8b6f/src/mongo/db/s/migration_chunk_cloner_source_legacy.h#L285-L286&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;under the cloner&apos;s internal mutex&lt;/a&gt;. We should rework the function so to not access the storage subsystem while holding the mutex.&lt;/p&gt;</description>
                <environment></environment>
        <key id="721278">SERVER-40301</key>
            <summary>Don&apos;t access the filesystem under std::mutex in the chunk cloner&apos;s nextCloneBatch()</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 22 Mar 2019 18:50:59 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:42 +0000</updated>
                            <resolved>Wed, 3 Apr 2019 20:06:26 +0000</resolved>
                                    <version>3.4.20</version>
                    <version>3.6.11</version>
                    <version>4.0.7</version>
                    <version>4.1.9</version>
                                    <fixVersion>4.1.10</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2201110" author="xgen-internal-githook" created="Wed, 3 Apr 2019 20:06:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;name&apos;: &apos;Randolph Tan&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40301&quot; title=&quot;Don&amp;#39;t access the filesystem under std::mutex in the chunk cloner&amp;#39;s nextCloneBatch()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40301&quot;&gt;&lt;del&gt;SERVER-40301&lt;/del&gt;&lt;/a&gt; Don&apos;t hold mutex while doing queries in nextCloneBatch and nextModsBatch&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/47153dbf7aebeba9a5b9086a82709adfa6fd7226&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/47153dbf7aebeba9a5b9086a82709adfa6fd7226&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="722272">SERVER-40326</issuekey>
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