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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-13420] the notifier and syncSourceFeedback threads can reach a deadlock</title>
                <link>https://jira.mongodb.org/browse/SERVER-13420</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In connectOplogNotifier, the notifier thread grabs bgsync&apos;s _mutex and then calls syncSourceFeedback.connect() which grabs SyncSourceFeedback&apos;s _mtx and _connmtx. Meanwhile SyncSourceFeedback&apos;s run() loop grabs its _mtx and _connmtx and then calls bgsync&apos;s getSyncTarget() which grabs bgsync&apos;s _mutex. If each of these threads grabs their first lock, we end up deadlocked.&lt;/p&gt;</description>
                <environment></environment>
        <key id="128591">SERVER-13420</key>
            <summary>the notifier and syncSourceFeedback threads can reach a deadlock</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="9">Done</resolution>
                                        <assignee username="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="matt.dannenberg">Matt Dannenberg</reporter>
                        <labels>
                    </labels>
                <created>Mon, 31 Mar 2014 17:50:27 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:12 +0000</updated>
                            <resolved>Tue, 1 Apr 2014 12:30:19 +0000</resolved>
                                    <version>2.6.0-rc2</version>
                                    <fixVersion>2.6.0-rc3</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="530739" author="xgen-internal-githook" created="Tue, 1 Apr 2014 12:29:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dannenberg&apos;, u&apos;name&apos;: u&apos;matt dannenberg&apos;, u&apos;email&apos;: u&apos;matt.dannenberg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13420&quot; title=&quot;the notifier and syncSourceFeedback threads can reach a deadlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13420&quot;&gt;&lt;del&gt;SERVER-13420&lt;/del&gt;&lt;/a&gt; remove syncSourceFeedback connection management from the notifier thread&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 26f3c3140d6c49732d3462235d9dd496e17c504f)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9d9fcde8659cb103d68632064550fb490e370bef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9d9fcde8659cb103d68632064550fb490e370bef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="530736" author="xgen-internal-githook" created="Tue, 1 Apr 2014 12:28:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dannenberg&apos;, u&apos;name&apos;: u&apos;matt dannenberg&apos;, u&apos;email&apos;: u&apos;matt.dannenberg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13420&quot; title=&quot;the notifier and syncSourceFeedback threads can reach a deadlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13420&quot;&gt;&lt;del&gt;SERVER-13420&lt;/del&gt;&lt;/a&gt; remove syncSourceFeedback connection management from the notifier thread&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/26f3c3140d6c49732d3462235d9dd496e17c504f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/26f3c3140d6c49732d3462235d9dd496e17c504f&lt;/a&gt;&lt;/p&gt;</comment>
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