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    <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-57378] Fix data-race in the resharding commit monitor unit-tests</title>
                <link>https://jira.mongodb.org/browse/SERVER-57378</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;UnblocksWhenCancellationTokenIsCancelled&lt;/tt&gt; test (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9f6598c1e321b88d7467547a2d0a80a92ae5a944/src/mongo/db/s/resharding/resharding_coordinator_commit_monitor_test.cpp#L175-L180&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;defined here&lt;/a&gt;) may hang due to the following:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The main-thread proceeds with running commands for the mocked network interface (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/1e1ae49e84368b838c0f8e771a22a2cca077dc1c/src/mongo/db/s/resharding/resharding_coordinator_commit_monitor_test.cpp#L159-L160&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;), but is scheduled out after running the first command, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1e1ae49e84368b838c0f8e771a22a2cca077dc1c/src/mongo/db/s/resharding/resharding_coordinator_commit_monitor_test.cpp#L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cancels the cancelation token&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;The commit monitor is notified about the cancelation, by checking the cancelation token in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af1405bc804add82c458913c0f5955ca1917b999/src/mongo/db/s/resharding/resharding_coordinator_commit_monitor.cpp#L144-L146&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, and returns from the function that queries the shards. As a result, the instance of ARS goes out of scope, and the destructor for ARS cancels any pending network operations.&lt;/li&gt;
	&lt;li&gt;The main thread is scheduled again to run commands on behalf of the mocked network interface, but since the pending commands are canceled, it will stay blocked forever.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The simple fix for this data-race is to create a new fail-point that blocks the commit-monitor in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af1405bc804add82c458913c0f5955ca1917b999/src/mongo/db/s/resharding/resharding_coordinator_commit_monitor.cpp#L142&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, and unblocks it after canceling the cancelation token. This change obviates the need for the main thread to serve any commands for the mocked network interface.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1766814">SERVER-57378</key>
            <summary>Fix data-race in the resharding commit monitor unit-tests</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="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                            <label>servicearch-wfbf-day</label>
                    </labels>
                <created>Wed, 2 Jun 2021 22:38:11 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:45 +0000</updated>
                            <resolved>Thu, 3 Jun 2021 15:31:48 +0000</resolved>
                                                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4107330" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:23:40 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3863079" author="xgen-internal-githook" created="Mon, 7 Jun 2021 17:56:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57378&quot; title=&quot;Fix data-race in the resharding commit monitor unit-tests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57378&quot;&gt;&lt;del&gt;SERVER-57378&lt;/del&gt;&lt;/a&gt; Fix data-race in the resharding commit monitor unit-tests&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 30dff6a113de31eecf54a0721da61f6d3e781ffa)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b9b9650937fe86dbfef773aa9447c571c22ac137&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b9b9650937fe86dbfef773aa9447c571c22ac137&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3857617" author="xgen-internal-githook" created="Thu, 3 Jun 2021 15:29:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57378&quot; title=&quot;Fix data-race in the resharding commit monitor unit-tests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57378&quot;&gt;&lt;del&gt;SERVER-57378&lt;/del&gt;&lt;/a&gt; Fix data-race in the resharding commit monitor unit-tests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/30dff6a113de31eecf54a0721da61f6d3e781ffa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/30dff6a113de31eecf54a0721da61f6d3e781ffa&lt;/a&gt;&lt;/p&gt;</comment>
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