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    <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-34674] Prevent logical clock from advancing while it&apos;s disabled</title>
                <link>https://jira.mongodb.org/browse/SERVER-34674</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A race condition exists in the following situation:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;A call to readRequestMetadata can pass the check for the logical clock&apos;s being enabled.&lt;/li&gt;
	&lt;li&gt;A node can transition to an arbiter on another thread, disabling the logical clock.&lt;/li&gt;
	&lt;li&gt;readRequestMetadata can attempt to advance the logical clock, tripping the invariant that the logical clock is enabled.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Relevant lines are here:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b7b55e75bbf18bcd7e38fdee430e0fd972183f68/src/mongo/rpc/metadata.cpp#L93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/b7b55e75bbf18bcd7e38fdee430e0fd972183f68/src/mongo/rpc/metadata.cpp#L93&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b7b55e75bbf18bcd7e38fdee430e0fd972183f68/src/mongo/db/repl/replication_coordinator_impl.cpp#L569&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/b7b55e75bbf18bcd7e38fdee430e0fd972183f68/src/mongo/db/repl/replication_coordinator_impl.cpp#L569&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b7b55e75bbf18bcd7e38fdee430e0fd972183f68/src/mongo/rpc/metadata.cpp#L112&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/b7b55e75bbf18bcd7e38fdee430e0fd972183f68/src/mongo/rpc/metadata.cpp#L112&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="534035">SERVER-34674</key>
            <summary>Prevent logical clock from advancing while it&apos;s disabled</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 Apr 2018 17:24:44 +0000</created>
                <updated>Sun, 29 Oct 2023 22:32:23 +0000</updated>
                            <resolved>Mon, 14 May 2018 15:24:52 +0000</resolved>
                                    <version>3.7.7</version>
                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1890512" author="xgen-internal-githook" created="Mon, 14 May 2018 15:24:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34674&quot; title=&quot;Prevent logical clock from advancing while it&amp;#39;s disabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34674&quot;&gt;&lt;del&gt;SERVER-34674&lt;/del&gt;&lt;/a&gt; Remove _isEnabled invariants from the logical clock&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/15d7cab640425bcb4de62e6b3c13d9188181f5ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/15d7cab640425bcb4de62e6b3c13d9188181f5ce&lt;/a&gt;&lt;/p&gt;</comment>
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