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    <title>MongoDB Jira</title>
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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-34917] Move the expired transaction aborter thread off of PeriodicRunnerASIO</title>
                <link>https://jira.mongodb.org/browse/SERVER-34917</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;PeriodicRunnerASIO runs jobs serially and there are already jobs on it that take locks. Thus inactive transactions can block such PeriodicRunnerASIO jobs, and then the expired transaction aborter thread will never run to clear an expired transaction&apos;s lock resources, to unblock the PeriodicRunnerASIO jobs.&lt;/p&gt;

&lt;p&gt;While v4.0 transaction operations take only intent locks, a concurrent non-transaction operation like dropCollection that requires an exclusive X lock can block behind a transaction, and then the lock fairness policy will cause IS and IX lock requests to queue up behind the X lock request.&lt;/p&gt;

&lt;p&gt;So the following deadlock can occur in v4.0:&lt;br/&gt;
expired transaction aborter wait on -&amp;gt; PeriodicRunnerASIO job waits on -&amp;gt; drop cmd waits on -&amp;gt; inactive transaction locks&lt;/p&gt;
</description>
                <environment></environment>
        <key id="541541">SERVER-34917</key>
            <summary>Move the expired transaction aborter thread off of PeriodicRunnerASIO</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="13203">Gone away</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 May 2018 14:41:25 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:08 +0000</updated>
                            <resolved>Fri, 11 May 2018 03:07:48 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1888815" author="dianna.hohensee" created="Fri, 11 May 2018 03:07:27 +0000"  >&lt;p&gt;I&apos;m resolving this ticket as gone away, since running on the PeriodicRunner is no longer a problem due to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34923&quot; title=&quot;Replace PeriodicRunnerASIO&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34923&quot;&gt;&lt;del&gt;SERVER-34923&lt;/del&gt;&lt;/a&gt;. The repro in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34732&quot; title=&quot;collection drop hangs in test of transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34732&quot;&gt;&lt;del&gt;SERVER-34732&lt;/del&gt;&lt;/a&gt; now runs without a hang.&lt;/p&gt;</comment>
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