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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20234] Async MockStream&apos;s race in unblock </title>
                <link>https://jira.mongodb.org/browse/SERVER-20234</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;AsyncMockStreamFactor::MockStream::unblock() drops its lock to unblock consuming threads.  Then it re-acquires the lock before returning.&lt;/p&gt;

&lt;p&gt;Under enough contention, this can lead simulateServer to attempt to re-acquire a lock that has just gotten deleted if completeOperation finishes within NetworkInterfaceASIO in time.&lt;/p&gt;

&lt;p&gt;The solution is to avoid dropping the lock for the notify.&lt;/p&gt;</description>
                <environment></environment>
        <key id="227859">SERVER-20234</key>
            <summary>Async MockStream&apos;s race in unblock </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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Mon, 31 Aug 2015 22:36:08 +0000</created>
                <updated>Sat, 19 Sep 2015 00:11:16 +0000</updated>
                            <resolved>Mon, 31 Aug 2015 22:38:42 +0000</resolved>
                                    <version>3.1.7</version>
                                    <fixVersion>3.1.8</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1018784" author="xgen-internal-githook" created="Mon, 31 Aug 2015 22:38:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hanumantmk&apos;, u&apos;name&apos;: u&apos;Jason Carey&apos;, u&apos;email&apos;: u&apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20234&quot; title=&quot;Async MockStream&amp;#39;s race in unblock &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20234&quot;&gt;&lt;del&gt;SERVER-20234&lt;/del&gt;&lt;/a&gt; Async MockStream&apos;s race in unblock&lt;/p&gt;

&lt;p&gt;AsyncMockStreamFactor::MockStream::unblock() drops its lock to unblock&lt;br/&gt;
consuming threads. Then it re-acquires the lock before returning.&lt;/p&gt;

&lt;p&gt;Under enough contention, this can lead simulateServer to attempt to&lt;br/&gt;
re-acquire a lock that has just gotten deleted if completeOperation&lt;br/&gt;
finishes within NetworkInterfaceASIO in time.&lt;/p&gt;

&lt;p&gt;The solution is to avoid dropping the lock for the notify.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/78f7878663828b5fb70d102a338a32dd91ac2cea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/78f7878663828b5fb70d102a338a32dd91ac2cea&lt;/a&gt;&lt;/p&gt;</comment>
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