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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-35576] Fix PlanCacheClear::clear time of check/time of use bug</title>
                <link>https://jira.mongodb.org/browse/SERVER-35576</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;PlanCacheClear::clear, two checks happen: one for whether the cache entry exists, and another for whether removing it was successful:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/56a4d894cc679db1ccd2336c490a1c3cd838f0d6/src/mongo/db/commands/plan_cache_commands.cpp#L313-L325&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/56a4d894cc679db1ccd2336c490a1c3cd838f0d6/src/mongo/db/commands/plan_cache_commands.cpp#L313-L325&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This strange because the call to &lt;tt&gt;contains()&lt;/tt&gt; and &lt;tt&gt;remove()&lt;/tt&gt; each acquire the plan cache mutex separately, so it&apos;s possible for something to happen between the two calls and for the command to return an error without logging a message. While this won&apos;t crash the server or do anything &lt;em&gt;really&lt;/em&gt; nasty, we should fix it. This would just involve removing the call to &lt;tt&gt;contains()&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I do not believe we&apos;d need to add any specific testing for this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="558480">SERVER-35576</key>
            <summary>Fix PlanCacheClear::clear time of check/time of use bug</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="yuta.arai@mongodb.com">Yuta Arai</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 13 Jun 2018 14:10:49 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:50 +0000</updated>
                            <resolved>Mon, 10 Sep 2018 15:14:27 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1996912" author="xgen-internal-githook" created="Fri, 7 Sep 2018 21:12:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;yarai&apos;, &apos;email&apos;: &apos;yuta.arai@10gen.com&apos;, &apos;username&apos;: &apos;yarai&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35576&quot; title=&quot;Fix PlanCacheClear::clear time of check/time of use bug&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35576&quot;&gt;&lt;del&gt;SERVER-35576&lt;/del&gt;&lt;/a&gt; Fixed PlanCacheClear clear time of check&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5310a3a7ab70f44bd864c4738aa95d0165256945&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5310a3a7ab70f44bd864c4738aa95d0165256945&lt;/a&gt;&lt;/p&gt;</comment>
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