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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-56560] Avoid thread scheduling deadlock in create collection coordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-56560</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/create_collection_coordinator.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;create collection coordinator&lt;/a&gt; is executed on the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ca592cd08f5050951e244db170a1b986d1dd8a8/src/mongo/db/repl/primary_only_service.cpp#L291-L306&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingDDLCoordinator service thread pool &lt;/a&gt;that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ca592cd08f5050951e244db170a1b986d1dd8a8/src/mongo/db/s/sharding_ddl_coordinator_service.h#L57-L59&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is capped to max 6 concurrent threads&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The problem is that this coordinator schedule a task on this threadpool and wait synchronously for its completion without releasing its current thread. If the threadpool doesn&apos;t have any available thread to execute the task the coordinator will hang forever.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1698714">SERVER-56560</key>
            <summary>Avoid thread scheduling deadlock in create collection coordinator</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>PM-1965-Milestone-1</label>
                    </labels>
                <created>Sun, 2 May 2021 12:07:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:10 +0000</updated>
                            <resolved>Mon, 3 May 2021 13:16:49 +0000</resolved>
                                    <version>Backlog</version>
                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3764352" author="xgen-internal-githook" created="Mon, 10 May 2021 17:17:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56495&quot; title=&quot;Complete TODO listed in SERVER-55396&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56495&quot;&gt;&lt;del&gt;SERVER-56495&lt;/del&gt;&lt;/a&gt; Remove TODO already addressed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56560&quot; title=&quot;Avoid thread scheduling deadlock in create collection coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56560&quot;&gt;&lt;del&gt;SERVER-56560&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/691aa844de3827a0aae0978feb34a6e7c5298ad5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/691aa844de3827a0aae0978feb34a6e7c5298ad5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3751596" author="xgen-internal-githook" created="Mon, 3 May 2021 13:11:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56560&quot; title=&quot;Avoid thread scheduling deadlock in create collection coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56560&quot;&gt;&lt;del&gt;SERVER-56560&lt;/del&gt;&lt;/a&gt; Avoid thread scheduling deadlock in create collection coordinator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/85dad3bf26622966b7c144751e14d0d6983bc75d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/85dad3bf26622966b7c144751e14d0d6983bc75d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1698490">SERVER-56555</issuekey>
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