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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-36738] BlockingResultsMergerTest incorrectly configures blocking next call</title>
                <link>https://jira.mongodb.org/browse/SERVER-36738</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9fd731be471c3d0f40bf5208f2bdd3923c9ea3e8/src/mongo/s/query/blocking_results_merger_test.cpp#L79-L116&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This test&lt;/a&gt; is attempting to verify that a blocking call to &lt;tt&gt;BlockingResultsMerger::next()&lt;/tt&gt; can be interrupted via the &lt;tt&gt;OperationContext&lt;/tt&gt;. This test was adapted from &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.0/src/mongo/s/query/async_results_merger_test.cpp#L1926&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this test&lt;/a&gt; during &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33323&quot; title=&quot;Refactor $mergeCursors stage to allow it to be used to merge cursors on mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33323&quot;&gt;&lt;del&gt;SERVER-33323&lt;/del&gt;&lt;/a&gt;, but mistakenly changed the configuration so that the cursor was tailable and awaitData. Now that the cursor is tailable and awaitData, the call to &lt;tt&gt;next()&lt;/tt&gt; is actually going into &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9fd731be471c3d0f40bf5208f2bdd3923c9ea3e8/src/mongo/s/query/blocking_results_merger.cpp#L56-L57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this code path&lt;/a&gt; which reads the &lt;tt&gt;awaitDataState&lt;/tt&gt; off the OperationContext. This state has not been configured by the test, so the &lt;tt&gt;Date_t&lt;/tt&gt; that is part of that struct will be default-constructed to the unix epoch. This means that the thread waiting for the event can be woken up immediately. On a tailable and awaitData cursor this is not an error and causes the call to &lt;tt&gt;next()&lt;/tt&gt; to return EOF with an OK status.&lt;/p&gt;

&lt;p&gt;This causes &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9fd731be471c3d0f40bf5208f2bdd3923c9ea3e8/src/mongo/s/query/blocking_results_merger_test.cpp#L91&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this assertion&lt;/a&gt; to fail. As a result, the BlockingResultsMerger is destroyed upon exit, but has not yet cleaned up all of the remote cursors, so further triggers &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9fd731be471c3d0f40bf5208f2bdd3923c9ea3e8/src/mongo/s/query/async_results_merger.cpp#L115&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this invariant&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="590207">SERVER-36738</key>
            <summary>BlockingResultsMergerTest incorrectly configures blocking next call</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Aug 2018 18:45:06 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:50 +0000</updated>
                            <resolved>Tue, 21 Aug 2018 22:10:08 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Querying</component>
                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1981921" author="xgen-internal-githook" created="Tue, 21 Aug 2018 22:09:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36738&quot; title=&quot;BlockingResultsMergerTest incorrectly configures blocking next call&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36738&quot;&gt;&lt;del&gt;SERVER-36738&lt;/del&gt;&lt;/a&gt; Block without timeout when test expects to block.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/853cb4d0b54353bb835b27f6332cbb3ad8f5cb3f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/853cb4d0b54353bb835b27f6332cbb3ad8f5cb3f&lt;/a&gt;&lt;/p&gt;</comment>
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