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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-75511] FLE2 unsharded compaction may deadlock if a setFCV occurs concurrently</title>
                <link>https://jira.mongodb.org/browse/SERVER-75511</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a setFCV command is issued while a FLE 2 compaction (unsharded) operation has transactions running,  the FCV op observer will abort those transactions, and cause them to be retried.  The FCV command then waits until it can acquire the FCV lock in S mode. At this point the FCV command is blocked, because the compact command is still holding onto a DBLock (and the global lock) in IX mode &lt;a href=&quot;https://github.com/mongodb/mongo/blob/25ee01d72c5de1ef751679b9fdc63154adad553d/src/mongo/db/commands/fle2_compact_cmd.cpp#L81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Meanwhile, the The retry transaction step will issue a &quot;best effort abort&quot; on the cancelled transaction, which entails issuing an &lt;tt&gt;abortTransaction&lt;/tt&gt; command (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/25ee01d72c5de1ef751679b9fdc63154adad553d/src/mongo/db/transaction/transaction_api.cpp#L292&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;).  The invocation of this command ultimately tries to acquire the global lock on IX mode as well, so it also blocks.  This lock acquisition happens &lt;a href=&quot;https://github.com/mongodb/mongo/blob/25ee01d72c5de1ef751679b9fdc63154adad553d/src/mongo/db/transaction/transaction_participant.cpp#L545&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2302326">SERVER-75511</key>
            <summary>FLE2 unsharded compaction may deadlock if a setFCV occurs concurrently</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="erwin.pe@mongodb.com">Erwin Pe</assignee>
                                    <reporter username="erwin.pe@mongodb.com">Erwin Pe</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Mar 2023 17:04:08 +0000</created>
                <updated>Sun, 29 Oct 2023 21:23:56 +0000</updated>
                            <resolved>Thu, 6 Apr 2023 19:48:30 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5330749" author="xgen-internal-githook" created="Thu, 6 Apr 2023 18:35:09 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Erwin Pe&apos;, &apos;email&apos;: &apos;erwin.pe@mongodb.com&apos;, &apos;username&apos;: &apos;erwee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75511&quot; title=&quot;FLE2 unsharded compaction may deadlock if a setFCV occurs concurrently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75511&quot;&gt;&lt;del&gt;SERVER-75511&lt;/del&gt;&lt;/a&gt; Block setFCV while performing unsharded compaction&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/210d64dc0fb5bccff00495849855cf9d5d37e9d3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/210d64dc0fb5bccff00495849855cf9d5d37e9d3&lt;/a&gt;&lt;/p&gt;</comment>
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