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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-41869] Reverse mutex acquisition order in CatalogCache::_scheduleCollectionRefresh</title>
                <link>https://jira.mongodb.org/browse/SERVER-41869</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;CatalogCache::_scheduleCollectionRefresh holds CatalogCache::_mutex while calling ShardServerCatalogCacheLoader::getsChunkSince, which will try to grab ShardServerCCL::_mutex at the beginning:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.10/src/mongo/s/catalog_cache.cpp#L603&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r4.0.10/src/mongo/s/catalog_cache.cpp#L603&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Inside async task, tries to run callback while holding ShardServerCLL::_mutex:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.10/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L416&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r4.0.10/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L416&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;and the callback tries to grab the CatalogCache::_mutex:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.10/src/mongo/s/catalog_cache.cpp#L577&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r4.0.10/src/mongo/s/catalog_cache.cpp#L577&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="810766">SERVER-41869</key>
            <summary>Reverse mutex acquisition order in CatalogCache::_scheduleCollectionRefresh</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Jun 2019 19:54:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:19:40 +0000</updated>
                            <resolved>Wed, 3 Jul 2019 12:54:28 +0000</resolved>
                                    <version>3.6.13</version>
                    <version>4.0.10</version>
                                    <fixVersion>3.6.14</fixVersion>
                    <fixVersion>4.0.11</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="2311336" author="xgen-internal-githook" created="Wed, 3 Jul 2019 16:15:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41869&quot; title=&quot;Reverse mutex acquisition order in CatalogCache::_scheduleCollectionRefresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41869&quot;&gt;&lt;del&gt;SERVER-41869&lt;/del&gt;&lt;/a&gt; On term mismatch do not invoke the getChunkSince callback under mutex&lt;/p&gt;

&lt;p&gt;As part of this change also backports the following cleanup:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Use alias for the callback of CatalogCacheLoader::getChunksSince&lt;/li&gt;
	&lt;li&gt;Use StringMap in CollectionShardingState instead of std::unordered_map&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(cherry picked from commit cb0393248d26e21e69efde15d9d3965293ead29b)&lt;br/&gt;
(cherry picked from commit 059b8a9dc777e3940caa26f2a909d4988b605645)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6296d2f907565ec44410a43868ee41cf46fbdd16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6296d2f907565ec44410a43868ee41cf46fbdd16&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2310915" author="xgen-internal-githook" created="Wed, 3 Jul 2019 12:53:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;username&apos;: &apos;kaloianm&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41869&quot; title=&quot;Reverse mutex acquisition order in CatalogCache::_scheduleCollectionRefresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41869&quot;&gt;&lt;del&gt;SERVER-41869&lt;/del&gt;&lt;/a&gt; Rename `struct dbTask` to DBTask&lt;/p&gt;

&lt;p&gt;... to follow naming conventions&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b919fb48eb611b3c8cbba9d7f03f6df1d25d4cd5)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6fa35fa8ffa5edd47a2e78e11f524a03fd99567d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6fa35fa8ffa5edd47a2e78e11f524a03fd99567d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2310914" author="xgen-internal-githook" created="Wed, 3 Jul 2019 12:53:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;username&apos;: &apos;kaloianm&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41869&quot; title=&quot;Reverse mutex acquisition order in CatalogCache::_scheduleCollectionRefresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41869&quot;&gt;&lt;del&gt;SERVER-41869&lt;/del&gt;&lt;/a&gt; On term mismatch do not invoke the getChunkSince callback under mutex&lt;/p&gt;

&lt;p&gt;As part of this change also backports the following cleanup:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Use alias for the callback of CatalogCacheLoader::getChunksSince&lt;/li&gt;
	&lt;li&gt;Use StringMap in CollectionShardingState instead of std::unordered_map&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(cherry picked from commit cb0393248d26e21e69efde15d9d3965293ead29b)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/059b8a9dc777e3940caa26f2a909d4988b605645&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/059b8a9dc777e3940caa26f2a909d4988b605645&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2293517" author="renctan" created="Fri, 21 Jun 2019 19:55:35 +0000"  >&lt;p&gt;Note: this deadlock no longer exists in v4.2 due to the changes made in this commit: &lt;a href=&quot;https://github.com/mongodb/mongo/commit/cb0393248d26e21e69efde15d9d3965293ead29b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cb0393248d26e21e69efde15d9d3965293ead29b&lt;/a&gt;&lt;/p&gt;</comment>
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