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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-38858] Fix race in blocking_results_merger_test</title>
                <link>https://jira.mongodb.org/browse/SERVER-38858</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a race in ShouldBeAbleToBlockUntilNextResultIsReadyWithDeadline:&lt;/p&gt;
</description>
                <environment></environment>
        <key id="665938">SERVER-38858</key>
            <summary>Fix race in blocking_results_merger_test</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="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Jan 2019 23:19:55 +0000</created>
                <updated>Sun, 29 Oct 2023 22:25:21 +0000</updated>
                            <resolved>Fri, 11 Jan 2019 21:29:34 +0000</resolved>
                                                    <fixVersion>4.1.7</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2112947" author="xgen-internal-githook" created="Fri, 11 Jan 2019 21:18:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;ian.boros@10gen.com&apos;, &apos;name&apos;: &apos;Ian Boros&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38858&quot; title=&quot;Fix race in blocking_results_merger_test&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38858&quot;&gt;&lt;del&gt;SERVER-38858&lt;/del&gt;&lt;/a&gt; fix race&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/424621d33255e28cf5f4988935a0d175f6e9fd78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/424621d33255e28cf5f4988935a0d175f6e9fd78&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2106309" author="ian.boros" created="Sat, 5 Jan 2019 00:19:01 +0000"  >&lt;p&gt;Notes to myself about this:&lt;/p&gt;

&lt;p&gt;It&apos;s possible that the response to the getMore scheduled by this call to next() (see line 140) is already queued up, causing next() to return a document.&lt;/p&gt;

&lt;p&gt;Specifically, the following order of events will cause this part of the test to fail:&lt;/p&gt;

&lt;p&gt;1) the onCommand() on line 140 is run&lt;br/&gt;
2) blockingMerger.next() is entered on line 124 (does not complete yet)&lt;br/&gt;
2) BlockingResultsMerger::next() schedules the getMore: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/907c8c786e26414735892bfbe763cd67e7f7e7e4/src/mongo/s/query/blocking_results_merger.cpp#L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/907c8c786e26414735892bfbe763cd67e7f7e7e4/src/mongo/s/query/blocking_results_merger.cpp#L86&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;4) The response to the getMore is processed and queued up by the network thread. The &quot;event&quot; returned by the code above is signaled&lt;br/&gt;
5) BlockingResultsMerger::next() waits for the event: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/907c8c786e26414735892bfbe763cd67e7f7e7e4/src/mongo/s/query/blocking_results_merger.cpp#L93-L94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/907c8c786e26414735892bfbe763cd67e7f7e7e4/src/mongo/s/query/blocking_results_merger.cpp#L93-L94&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Since it&apos;s already been signaled, the document is available, so it is returned.&lt;/p&gt;

&lt;p&gt;6) The assertion fails because next is not EOF.&lt;/p&gt;</comment>
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