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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-32554] Source shard stepdown while entering critical section can trigger cloner invariant</title>
                <link>https://jira.mongodb.org/browse/SERVER-32554</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A stepdown during MigrationSourceManager::enterCriticalSection can trigger the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd9ed5bbe0/src/mongo/db/s/migration_source_manager.cpp#L290&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cleanupOnError scope guard&lt;/a&gt; and eventually call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd9ed5bbe0/src/mongo/db/s/migration_source_manager.cpp#L650-L699&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MigrationSourceManager::_cleanup&lt;/a&gt;. This function std::moves the manager&apos;s clone driver into a local variable so it is destructed when the function exits, but it calls two functions before calling cancelClone on the cloneDriver (which puts it into state kDone), and if either of them throws (which ShardServerCatalogCacheLoader::waitForCollectionFlush can &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd9ed5bbe0/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L392-L395&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if the node&apos;s replication role changes&lt;/a&gt;), the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd9ed5bbe0/src/mongo/db/s/migration_chunk_cloner_source_legacy.cpp#L199&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant in the clone driver&apos;s destructor fails&lt;/a&gt;, because it will still be in state kCloning.&lt;/p&gt;

&lt;p&gt;I think the fix would be to either move the cancelClone call earlier in _cleanup, or put it in a scope guard declared after _cloneDriver is extracted into a local variable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="479246">SERVER-32554</key>
            <summary>Source shard stepdown while entering critical section can trigger cloner invariant</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Fri, 5 Jan 2018 16:31:43 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:33 +0000</updated>
                            <resolved>Mon, 8 Jan 2018 22:49:04 +0000</resolved>
                                                    <fixVersion>3.6.3</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1774993" author="xgen-internal-githook" created="Tue, 16 Jan 2018 14:56:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32554&quot; title=&quot;Source shard stepdown while entering critical section can trigger cloner invariant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32554&quot;&gt;&lt;del&gt;SERVER-32554&lt;/del&gt;&lt;/a&gt; Ensure migration cloner is cancelled in cleanup&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9f36a4b903401c8d2f1f7e248cf96eaa64ff99ce)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5f4c526b0d33e0aa305d33e17b4f466216b2b556&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5f4c526b0d33e0aa305d33e17b4f466216b2b556&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1768362" author="xgen-internal-githook" created="Mon, 8 Jan 2018 22:48:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32554&quot; title=&quot;Source shard stepdown while entering critical section can trigger cloner invariant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32554&quot;&gt;&lt;del&gt;SERVER-32554&lt;/del&gt;&lt;/a&gt; Ensure migration cloner is cancelled in cleanup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9f36a4b903401c8d2f1f7e248cf96eaa64ff99ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9f36a4b903401c8d2f1f7e248cf96eaa64ff99ce&lt;/a&gt;&lt;/p&gt;</comment>
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