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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2645] Potential distributed lock forcing inconsistency</title>
                <link>https://jira.mongodb.org/browse/SERVER-2645</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a distributed lock is forced:&lt;/p&gt;

&lt;p&gt;from distlock.cpp&amp;gt;&lt;/p&gt;

&lt;p&gt;                log() &amp;lt;&amp;lt; &quot;dist_lock forcefully taking over from: &quot; &amp;lt;&amp;lt; o &amp;lt;&amp;lt; &quot; elapsed minutes: &quot; &amp;lt;&amp;lt; elapsed &amp;lt;&amp;lt; endl;&lt;br/&gt;
                conn-&amp;gt;update( _ns , _id , BSON( &quot;$set&quot; &amp;lt;&amp;lt; BSON( &quot;state&quot; &amp;lt;&amp;lt; 0 ) ) );&lt;/p&gt;

&lt;p&gt;the update takes into account only the &lt;b&gt;name&lt;/b&gt; of the lock, not it&apos;s current state or the unique ts value associated with every active lock entry.  If processes interleave such that:&lt;/p&gt;

&lt;p&gt;Process 0 crashes with lock&lt;br/&gt;
Process 1 detects forcing required&lt;br/&gt;
Process 2 detects forcing required&lt;br/&gt;
Process 1 forces Process 0 lock by name, creates and acquires new lock with same name&lt;br/&gt;
Process 2 forces Process 1 lock by name, which is bad because Process 1 is still using that lock&lt;/p&gt;

&lt;p&gt;Fix: Check for ts value and state&lt;/p&gt;

&lt;p&gt;conn-&amp;gt;update( _ns , BSON( &quot;_id&quot; &amp;lt;&amp;lt; _id&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;_id&amp;quot;&amp;#93;&lt;/span&gt;.String() &amp;lt;&amp;lt; &quot;state&quot; &amp;lt;&amp;lt; o&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;state&amp;quot;&amp;#93;&lt;/span&gt;.numberInt() &amp;lt;&amp;lt; &quot;ts&quot; &amp;lt;&amp;lt; o&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;ts&amp;quot;&amp;#93;&lt;/span&gt; ), BSON( &quot;$set&quot; &amp;lt;&amp;lt; BSON( &quot;state&quot; &amp;lt;&amp;lt; 0 ) ) );&lt;/p&gt;

&lt;p&gt;Difficult to reproduce without new test cases which modify timeout.  &lt;/p&gt;</description>
                <environment></environment>
        <key id="14936">SERVER-2645</key>
            <summary>Potential distributed lock forcing inconsistency</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="9">Done</resolution>
                                        <assignee username="greg_10gen">Greg Studer</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Mar 2011 00:57:03 +0000</created>
                <updated>Tue, 12 Jul 2016 00:18:26 +0000</updated>
                            <resolved>Wed, 2 Mar 2011 15:39:57 +0000</resolved>
                                                    <fixVersion>1.9.0</fixVersion>
                                    <component>Concurrency</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
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