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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-70653] CreateCollectionCoordinator should check if a request has been already served without acquiring the CriticalSection over the collection (for both current and legacy request versions).</title>
                <link>https://jira.mongodb.org/browse/SERVER-70653</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It has been observed a failure on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/jstests/concurrency/fsm_workloads/autosplit_setFCV_downgrade_from_60.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;autosplit_setFCV_downgrade_from_60.js&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Looking at the logs, the following sequence may have triggered &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2cc7da28b9ddd1eb91516a2ba25f7dd67db88ca8/src/mongo/db/s/sharding_migration_critical_section.cpp#L62&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this invariant&lt;/a&gt;:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;&lt;tt&gt;j0:s0:prim&lt;/tt&gt; succesfully completes the &lt;tt&gt;shardCollection()&lt;/tt&gt; of &lt;tt&gt;test10_fsmdb0.autosplit_setFCV_downgrade_from_60_1&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;j0:s0:prim&lt;/tt&gt; gets downgraded to 6.0 (from now on, any new &lt;tt&gt;shardCollection()&lt;/tt&gt; request will be served applying the V2 of the DDL coordinator.&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;j0:s0:prim&lt;/tt&gt; starts donating a chunk of  &lt;tt&gt;test10_fsmdb0.autosplit_setFCV_downgrade_from_60_1&lt;/tt&gt; and acquires the critical section for the collection&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;j0:s0:prim&lt;/tt&gt; receives a second  &lt;tt&gt;shardCollection()&lt;/tt&gt; request for &lt;tt&gt;test10_fsmdb0.autosplit_setFCV_downgrade_from_60_1&lt;/tt&gt;, which should be treated as a no-op;
	&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
		&lt;li&gt;being run as a V2 DDL, it needs to acquire the critical section before verifying that the command is equivalent to what has been performed on step 1&lt;/li&gt;
		&lt;li&gt;nevertheless, such acquisition is illegal due to step 3 - and leads to the invariant&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2161186">SERVER-70653</key>
            <summary>CreateCollectionCoordinator should check if a request has been already served without acquiring the CriticalSection over the collection (for both current and legacy request versions).</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="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                    </labels>
                <created>Tue, 18 Oct 2022 07:41:55 +0000</created>
                <updated>Sun, 29 Oct 2023 21:31:48 +0000</updated>
                            <resolved>Mon, 24 Oct 2022 20:37:35 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4923674" author="xgen-internal-githook" created="Mon, 24 Oct 2022 20:25:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70653&quot; title=&quot;CreateCollectionCoordinator should check if a request has been already served without acquiring the CriticalSection over the collection (for both current and legacy request versions).&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70653&quot;&gt;&lt;del&gt;SERVER-70653&lt;/del&gt;&lt;/a&gt; Call checkIfCollectionIsAlreadySharded without acquiring the collection CriticalSection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0b55b04b6565de04d3c6fee3267f1a2812170633&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0b55b04b6565de04d3c6fee3267f1a2812170633&lt;/a&gt;&lt;/p&gt;</comment>
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