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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-63169] Fix deadlock in balancer_defragmentation_merge_chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-63169</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to prevent problems with step down during defragmentation, user cancellation of defragmentation no longer removes the defragmentCollection flag on the collection, but checks whether there is an existing defragmentation state for this collection and then changes the phase to kSplitChunks. This check &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3688d67613ff68795b42425d9a53a24a76940b19/src/mongo/db/s/balancer/balancer_defragmentation_policy_impl.cpp#L1368&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;requires a lock acquisition&lt;/a&gt;. If the test has completed phase 1 when defragmentation is cancelled, the balancer thread will be waiting&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/3688d67613ff68795b42425d9a53a24a76940b19/src/mongo/db/s/balancer/balancer_defragmentation_policy_impl.cpp#L1598&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;at the failpoint&lt;/a&gt; while holding the mutex, causing a deadlock with the cancellation.&lt;/p&gt;

&lt;p&gt;This can be solved by causing the failpoint to not pause, but make transition phases a no-op. Then the deadlock will be solved, and each balancer round will&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/3688d67613ff68795b42425d9a53a24a76940b19/src/mongo/db/s/balancer/balancer_defragmentation_policy_impl.cpp#L1402&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;try to transition phases again&lt;/a&gt; until the failpoint is cleared.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1974978">SERVER-63169</key>
            <summary>Fix deadlock in balancer_defragmentation_merge_chunks</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="allison.easton@mongodb.com">Allison Easton</assignee>
                                    <reporter username="allison.easton@mongodb.com">Allison Easton</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Feb 2022 15:16:51 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:18 +0000</updated>
                            <resolved>Wed, 2 Feb 2022 15:36:20 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4330444" author="xgen-internal-githook" created="Wed, 2 Feb 2022 15:30:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63169&quot; title=&quot;Fix deadlock in balancer_defragmentation_merge_chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63169&quot;&gt;&lt;del&gt;SERVER-63169&lt;/del&gt;&lt;/a&gt; Fix deadlock in balancer_defragmentation_merge_chunks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b2ec1f2a8da36081e7792a4299a894444d740f17&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b2ec1f2a8da36081e7792a4299a894444d740f17&lt;/a&gt;&lt;/p&gt;</comment>
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