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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-41584] Deadlock shutting down the PeriodicRunner while the LogicalSessionCache is refreshing</title>
                <link>https://jira.mongodb.org/browse/SERVER-41584</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a deadlock in the following scenario:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The secondary nodes of the config server shard are shut down cleanly&lt;/li&gt;
	&lt;li&gt;The test runner then attempts to shut down the primary shard of the config server (on mongod, process 28261, see stack trace above) and the shutdown process is initiated&lt;/li&gt;
	&lt;li&gt;The LogicalSessionCache then begins a refresh, which tries to create config.system.sessions. This sends ShardsvrShardCollection to one of the shards.&lt;/li&gt;
	&lt;li&gt;The shard then sends ConfigsvrCreateCollection back to the config server primary, which then tries to take the database dist lock, and then hangs in ReplicationCoordinatorImpl::waitUntilOpTimeForRead because the secondaries are down and the optime never advances&lt;/li&gt;
	&lt;li&gt;In the meantime, the shutdown thread advances to shut down the PeriodicRunner, but the LogicalSessionCacheRefresh job is running inside the PeriodicRunner, and it&apos;s hanging, so the PeriodicRunner can never shut down.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;There are a lot of potential fixes, including:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Separate PeriodicRunner shutdown from join, so that we can kill all operations after shutting down the runner and then join jobs after that&lt;/li&gt;
	&lt;li&gt;Put a timeout on the read for the distlock acquisition&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="793885">SERVER-41584</key>
            <summary>Deadlock shutting down the PeriodicRunner while the LogicalSessionCache is refreshing</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="3">Duplicate</resolution>
                                        <assignee username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                            <label>sharding-4.4-stabilization</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 7 Jun 2019 20:33:05 +0000</created>
                <updated>Wed, 25 Mar 2020 00:29:32 +0000</updated>
                            <resolved>Wed, 25 Mar 2020 00:29:32 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2995485" author="amirsaman.memaripour" created="Wed, 25 Mar 2020 00:29:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46841&quot; title=&quot;Make PeriodicRunner interrupt blocked operations on stop&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46841&quot;&gt;&lt;del&gt;SERVER-46841&lt;/del&gt;&lt;/a&gt; should fix this issue.&lt;/p&gt;</comment>
                            <comment id="2300670" author="misha.tyulenev" created="Thu, 27 Jun 2019 14:28:13 +0000"  >&lt;p&gt;This issue is separate from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41217&quot; title=&quot;Potential deadlock between ShardRegistry and LSC refresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41217&quot;&gt;&lt;del&gt;SERVER-41217&lt;/del&gt;&lt;/a&gt; as its a deadlock not related to ShardRegistry reload. However, it should be fixed and I think that the fixes can be related.&lt;/p&gt;</comment>
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            <issuekey id="981085">SERVER-44279</issuekey>
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