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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-80978] Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-80978</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The mechanism introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68477&quot; title=&quot;Improve NaN-handling for expireAfterSeconds TTL index parameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68477&quot;&gt;&lt;del&gt;SERVER-68477&lt;/del&gt;&lt;/a&gt; to resolve invalid expireAfterSeconds values and prevent unintended document deletions can potentially induce a deadlock during step-up with appropriate prepared transactions.&lt;/p&gt;

&lt;p&gt;A prepared transaction which has a write to a collection &quot;foo&quot; will reacquire an IX lock on &quot;foo&quot; &lt;a href=&quot;https://github.com/10gen/mongo/blob/3226ff88ab0c7b23ff03c6dbaf88f2a825914138/src/mongo/db/session/session_catalog_mongod.cpp#L557-L560&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;prior&lt;/a&gt; to &lt;a href=&quot;https://github.com/10gen/mongo/blob/3226ff88ab0c7b23ff03c6dbaf88f2a825914138/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L571&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;running&lt;/a&gt; the index onStepUp method, where the TTLMonitor will attempt to acquire an X lock on a collection &quot;foo&quot; if it decides it needs to normalize its index spec. We cannot safely reverse the order of the operations.&lt;/p&gt;

&lt;p&gt;As of this time we have not observed this deadlock in practice in any released builds, so we believe it to be extremely rare, and will be addressing it out of an abundance of caution.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2439643">SERVER-80978</key>
            <summary>Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction</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="daotang.yang@mongodb.com">Daotang Yang</assignee>
                                    <reporter username="dan.larkin-york@mongodb.com">Dan Larkin-York</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Sep 2023 14:07:53 +0000</created>
                <updated>Wed, 24 Jan 2024 17:17:47 +0000</updated>
                            <resolved>Tue, 9 Jan 2024 19:07:15 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                    <fixVersion>7.0.6</fixVersion>
                    <fixVersion>5.0.25</fixVersion>
                    <fixVersion>6.0.14</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="6036888" author="xgen-internal-githook" created="Wed, 24 Jan 2024 07:45:36 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;mongodt&apos;, &apos;email&apos;: &apos;146988481+mongodt@users.noreply.github.com&apos;, &apos;username&apos;: &apos;mongodt&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80978&quot; title=&quot;Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80978&quot;&gt;&lt;del&gt;SERVER-80978&lt;/del&gt;&lt;/a&gt; Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction (#17863)&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 662c63e868af3fe388ad4d81b14c479b2f5be7f9)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 4b5d21e1ada5db5ac9eb662707a98cc4df17ecad&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6328bdefc28e386f56e53d06723dd29ae6d5b24a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6328bdefc28e386f56e53d06723dd29ae6d5b24a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="6024039" author="xgen-internal-githook" created="Thu, 18 Jan 2024 21:36:41 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;mongodt&apos;, &apos;email&apos;: &apos;146988481+mongodt@users.noreply.github.com&apos;, &apos;username&apos;: &apos;mongodt&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80978&quot; title=&quot;Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80978&quot;&gt;&lt;del&gt;SERVER-80978&lt;/del&gt;&lt;/a&gt; Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction (#17863)&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 662c63e868af3fe388ad4d81b14c479b2f5be7f9)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 7a2d8a34790a82eafc406047efe0985fe0064e44&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8df7f440f9f135da0ae8b6b9e34a456bc68b3057&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8df7f440f9f135da0ae8b6b9e34a456bc68b3057&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="6018357" author="xgen-internal-githook" created="Wed, 17 Jan 2024 18:21:53 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;mongodt&apos;, &apos;email&apos;: &apos;146988481+mongodt@users.noreply.github.com&apos;, &apos;username&apos;: &apos;mongodt&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80978&quot; title=&quot;Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80978&quot;&gt;&lt;del&gt;SERVER-80978&lt;/del&gt;&lt;/a&gt; Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction (#17863)&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 662c63e868af3fe388ad4d81b14c479b2f5be7f9)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 3f108e717fbe7d00caeb67993f695efbf3f95093&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/462ae8ae2570308a697395365d7080d370e7c317&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/462ae8ae2570308a697395365d7080d370e7c317&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5998235" author="xgen-internal-githook" created="Tue, 9 Jan 2024 18:53:57 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;mongodt&apos;, &apos;email&apos;: &apos;146988481+mongodt@users.noreply.github.com&apos;, &apos;username&apos;: &apos;mongodt&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80978&quot; title=&quot;Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80978&quot;&gt;&lt;del&gt;SERVER-80978&lt;/del&gt;&lt;/a&gt; Fix potential deadlock between TTLMonitor::onStepUp and prepared transaction (#17863)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 662c63e868af3fe388ad4d81b14c479b2f5be7f9&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6e9f1c857df45d4d17c1bef31801322dd40415e5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6e9f1c857df45d4d17c1bef31801322dd40415e5&lt;/a&gt;&lt;/p&gt;</comment>
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