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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>
    </build-info>


<item>
            <title>[SERVER-39337] MigrationSourceManager can hit an invariant if initial lock acquisition timed out</title>
                <link>https://jira.mongodb.org/browse/SERVER-39337</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MSM modifies the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b8bfe9ff391ebeb10a5c2fb86979d854d17d0fd5/src/mongo/db/s/migration_source_manager.cpp#L242&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_state&lt;/a&gt; outside the collection lock and updates the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b8bfe9ff391ebeb10a5c2fb86979d854d17d0fd5/src/mongo/db/s/migration_source_manager.cpp#L259&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;decorator&lt;/a&gt; inside the lock. So, when &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b8bfe9ff391ebeb10a5c2fb86979d854d17d0fd5/src/mongo/db/s/migration_source_manager.cpp#L692-L700&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_cleanup gets run&lt;/a&gt; it is possible to have _state != created and decorator to be nullptr.&lt;/p&gt;</description>
                <environment></environment>
        <key id="682205">SERVER-39337</key>
            <summary>MigrationSourceManager can hit an invariant if initial lock acquisition timed out</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Feb 2019 19:34:29 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:30 +0000</updated>
                            <resolved>Tue, 5 Mar 2019 14:54:56 +0000</resolved>
                                    <version>4.1.7</version>
                                    <fixVersion>4.1.9</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2170989" author="xgen-internal-githook" created="Tue, 5 Mar 2019 14:53:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39337&quot; title=&quot;MigrationSourceManager can hit an invariant if initial lock acquisition timed out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39337&quot;&gt;&lt;del&gt;SERVER-39337&lt;/del&gt;&lt;/a&gt; Assume variables installed for chunk cloning only after state transitions to kCloning&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5e9df07fa5d0fdb0a26706473f580dbbde1e4baa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5e9df07fa5d0fdb0a26706473f580dbbde1e4baa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2157225" author="renctan" created="Wed, 20 Feb 2019 17:06:05 +0000"  >&lt;p&gt;lgtm&lt;/p&gt;</comment>
                            <comment id="2156551" author="blake.oler" created="Wed, 20 Feb 2019 00:53:09 +0000"  >&lt;p&gt;I&apos;ve been looking at the code, and I&apos;m not seeing any general problems with building in the following assumption:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;If we are still in kCreated, it is possible,&#160;but not guranteed, for the MSM to be on the CSR, and for the _cloneDriver&#160;to&#160;exist. To guarantee this, we will only transition to kCloning after both variables have been set.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;If we are still in kCreated on cleanup, we simply check if either variable exists &#8211; if so, do the already-existing cleanup task. This is fine because we will have the collection lock at the time of cleanup. If we&apos;re past kCreated, then we&apos;re good and can assume the variables exist regardless.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt; lgty?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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            <issuekey id="674873">SERVER-39091</issuekey>
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                            <customfieldvalue>&lt;p&gt;1. Run fsyncLock on to be donor shard.&lt;br/&gt;
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4. Run fsyncUnlock, this will allow the MSM::_cleanup to grab the collection lock, and then triggering the invariant.&lt;/p&gt;</customfieldvalue>

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