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    <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-62458] Fix deadlock in FCBIS _cloneFiles</title>
                <link>https://jira.mongodb.org/browse/SERVER-62458</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;&lt;ins&gt;Issue&lt;/ins&gt;:&lt;/b&gt;&lt;br/&gt;
 In &lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/blob/eba0791a9c80ca495a15a4ec097f49bbc81fa590/src/fcbis/file_copy_based_initial_syncer.cpp#L1118&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;FileCopyBasedInitialSyncer::_cloneFiles&lt;/a&gt;, we can have a deadlock while acquiring FileCopyBasedInitialSyncer::_mutex between the &lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/blob/eba0791a9c80ca495a15a4ec097f49bbc81fa590/src/fcbis/file_copy_based_initial_syncer.cpp#L1122&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;main asyncTry&lt;/a&gt; and the &lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/blob/eba0791a9c80ca495a15a4ec097f49bbc81fa590/src/fcbis/file_copy_based_initial_syncer.cpp#L1170&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;return future.&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I assume that can happen if the&#160;&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/blob/eba0791a9c80ca495a15a4ec097f49bbc81fa590/src/fcbis/file_copy_based_initial_syncer.cpp#L1158&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;startClonerFuture&lt;/a&gt; is ready before we hit the return statement.&lt;/p&gt;



&lt;p&gt;&lt;ins&gt;&lt;b&gt;Proposed fix:&lt;/b&gt;&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;The lock in the &lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/blob/eba0791a9c80ca495a15a4ec097f49bbc81fa590/src/fcbis/file_copy_based_initial_syncer.cpp#L1122&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;main asyncTry&lt;/a&gt;&#160;needs to be scoped to include only state&apos;s changing lines and not to include the return statement.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;&lt;b&gt;Needed for better debugging:&lt;/b&gt;&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;Can we add also a log line in the begging of&#160;&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/blob/eba0791a9c80ca495a15a4ec097f49bbc81fa590/src/fcbis/file_copy_based_initial_syncer.cpp#L1118&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;FileCopyBasedInitialSyncer::_cloneFiles&lt;/a&gt; to output the number of files in&#160;filesToClone&lt;/p&gt;</description>
                <environment></environment>
        <key id="1960757">SERVER-62458</key>
            <summary>Fix deadlock in FCBIS _cloneFiles</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="13201">Fixed</resolution>
                                        <assignee username="m.maher@mongodb.com">Moustafa Maher</assignee>
                                    <reporter username="m.maher@mongodb.com">Moustafa Maher</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Jan 2022 06:46:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:44:21 +0000</updated>
                            <resolved>Tue, 11 Jan 2022 18:17:27 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>5.2.0-rc6</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4286661" author="xgen-internal-githook" created="Tue, 11 Jan 2022 19:46:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Moustafa Maher Khalil&apos;, &apos;email&apos;: &apos;m.maher@mongodb.com&apos;, &apos;username&apos;: &apos;moustafamaher&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62458&quot; title=&quot;Fix deadlock in FCBIS _cloneFiles&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62458&quot;&gt;&lt;del&gt;SERVER-62458&lt;/del&gt;&lt;/a&gt; Fix deadlock in FCBIS _cloneFiles&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/0b9a52927cd90d589e76b008aa2c6b9a2df080c0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/0b9a52927cd90d589e76b008aa2c6b9a2df080c0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4286302" author="xgen-internal-githook" created="Tue, 11 Jan 2022 17:50:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Moustafa Maher Khalil&apos;, &apos;email&apos;: &apos;m.maher@mongodb.com&apos;, &apos;username&apos;: &apos;moustafamaher&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62458&quot; title=&quot;Fix deadlock in FCBIS _cloneFiles&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62458&quot;&gt;&lt;del&gt;SERVER-62458&lt;/del&gt;&lt;/a&gt; Fix deadlock in FCBIS _cloneFiles&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/c0512f09e311e3657e3e2d5554e60dc1b454b6e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/c0512f09e311e3657e3e2d5554e60dc1b454b6e6&lt;/a&gt;&lt;/p&gt;</comment>
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