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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-40084] Prevent readers from reading garbage/stale value from global_lock_acquisition_tracker.</title>
                <link>https://jira.mongodb.org/browse/SERVER-40084</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, when we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/43de192f45e15fefed5b5c033feee35848b1f066/src/mongo/db/concurrency/d_concurrency.cpp#L218&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;modify&lt;/a&gt;&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/43de192f45e15fefed5b5c033feee35848b1f066/src/mongo/db/concurrency/global_lock_acquisition_tracker.h#L67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;GlobalLockAcquisitionTracker:_globalLockMode&lt;/a&gt;, there is a possibility that the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/43de192f45e15fefed5b5c033feee35848b1f066/src/mongo/db/repl/replication_coordinator_impl.cpp#L1768-L1769&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;step down thread is reading its value&lt;/a&gt;&#160;concurrently. In order to avoid the step down thread from reading a garbage/stale value, make GlobalLockAcquisitionTracker:_globalLockMode as an AtomicWord&amp;lt;unsigned char&amp;gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="715235">SERVER-40084</key>
            <summary>Prevent readers from reading garbage/stale value from global_lock_acquisition_tracker.</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="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Mar 2019 05:23:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:02 +0000</updated>
                            <resolved>Thu, 28 Mar 2019 15:48:35 +0000</resolved>
                                                    <fixVersion>4.1.11</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2216908" author="judah.schvimer" created="Wed, 17 Apr 2019 18:53:33 +0000"  >&lt;p&gt;Between the above commits there was this revert:&lt;br/&gt;
Author:&lt;/p&gt;

{&apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;name&apos;: &apos;Benety Goh&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40069&quot; title=&quot;GlobalLockAcquisitionTracker::getGlobalWriteLocked should return true if the OperationContext it decorates ever held a global write lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40069&quot;&gt;&lt;del&gt;SERVER-40069&lt;/del&gt;&lt;/a&gt; Fix global lock tracking for txns&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit d99db775dbf73e27bd20e402f26f068dc199203d.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/46d303c2de5529d3158f1fe0afc5bbeef6444dac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/46d303c2de5529d3158f1fe0afc5bbeef6444dac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2216862" author="xgen-internal-githook" created="Wed, 17 Apr 2019 18:30:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;username&apos;: &apos;judahschvimer&apos;, &apos;email&apos;: &apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40069&quot; title=&quot;GlobalLockAcquisitionTracker::getGlobalWriteLocked should return true if the OperationContext it decorates ever held a global write lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40069&quot;&gt;&lt;del&gt;SERVER-40069&lt;/del&gt;&lt;/a&gt; Fix global lock tracking for txns&lt;/p&gt;

&lt;p&gt;Includes &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40084&quot; title=&quot;Prevent readers from reading garbage/stale value from global_lock_acquisition_tracker.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40084&quot;&gt;&lt;del&gt;SERVER-40084&lt;/del&gt;&lt;/a&gt;, stores global lock acquisition flag in an&lt;br/&gt;
atomic.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7a9f240519c55cc6af45e4783bfd54d81a79d1e0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7a9f240519c55cc6af45e4783bfd54d81a79d1e0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2194735" author="xgen-internal-githook" created="Thu, 28 Mar 2019 15:48:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;username&apos;: &apos;ajdavis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40069&quot; title=&quot;GlobalLockAcquisitionTracker::getGlobalWriteLocked should return true if the OperationContext it decorates ever held a global write lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40069&quot;&gt;&lt;del&gt;SERVER-40069&lt;/del&gt;&lt;/a&gt; Fix global lock tracking for txns&lt;/p&gt;

&lt;p&gt;Includes &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40084&quot; title=&quot;Prevent readers from reading garbage/stale value from global_lock_acquisition_tracker.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40084&quot;&gt;&lt;del&gt;SERVER-40084&lt;/del&gt;&lt;/a&gt;, stores global lock acquisition flags in an&lt;br/&gt;
atomic.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d99db775dbf73e27bd20e402f26f068dc199203d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d99db775dbf73e27bd20e402f26f068dc199203d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="714605">SERVER-40069</issuekey>
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