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    <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-41866] Reverse mutex acquisition order in CatalogCache::_scheduleDatabaseRefresh</title>
                <link>https://jira.mongodb.org/browse/SERVER-41866</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;CatalogCache::_mutex -&amp;gt; ShardServerCatalogCacheLoader::_mutex order:&lt;/p&gt;

&lt;p&gt;CatalogCache::_scheduleDatabaseRefresh has catalog cache mutex and calls getDatabase:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2393ed14199eddebe25e56bc0a8fe1d47f2297cf/src/mongo/s/catalog_cache.cpp#L532&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/2393ed14199eddebe25e56bc0a8fe1d47f2297cf/src/mongo/s/catalog_cache.cpp#L532&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;which will take the ShardServerCCL _mutex at the beginning of the call.&lt;/p&gt;

&lt;p&gt;ShardServerCCL::_mutex -&amp;gt; CatalogCache::_mutex order:&lt;/p&gt;

&lt;p&gt;Inside the async task lamda we take the ShardServerCCL mutex then tries to run a callback:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2393ed14199eddebe25e56bc0a8fe1d47f2297cf/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L460&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/2393ed14199eddebe25e56bc0a8fe1d47f2297cf/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L460&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;And the callback tries to get the CatalogCache::_mutex:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2393ed14199eddebe25e56bc0a8fe1d47f2297cf/src/mongo/s/catalog_cache.cpp#L523&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/2393ed14199eddebe25e56bc0a8fe1d47f2297cf/src/mongo/s/catalog_cache.cpp#L523&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="810665">SERVER-41866</key>
            <summary>Reverse mutex acquisition order in CatalogCache::_scheduleDatabaseRefresh</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 18:37:56 +0000</created>
                <updated>Sun, 29 Oct 2023 22:19:40 +0000</updated>
                            <resolved>Mon, 8 Jul 2019 15:13:20 +0000</resolved>
                                    <version>4.0.10</version>
                    <version>4.2.0-rc1</version>
                                    <fixVersion>4.0.11</fixVersion>
                    <fixVersion>4.2.0-rc3</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="2316715" author="xgen-internal-githook" created="Tue, 9 Jul 2019 13:09:25 +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-41866&quot; title=&quot;Reverse mutex acquisition order in CatalogCache::_scheduleDatabaseRefresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41866&quot;&gt;&lt;del&gt;SERVER-41866&lt;/del&gt;&lt;/a&gt; On term mismatch do not invoke the getDatabase callback under mutex`&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 75dc5684d4c6be0e8ac7c653f5389df9f45f1baf)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/08d395bc9e66e5be6caa5ae59d1eb50c5b053193&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/08d395bc9e66e5be6caa5ae59d1eb50c5b053193&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2316545" author="xgen-internal-githook" created="Tue, 9 Jul 2019 09:56:50 +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-41866&quot; title=&quot;Reverse mutex acquisition order in CatalogCache::_scheduleDatabaseRefresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41866&quot;&gt;&lt;del&gt;SERVER-41866&lt;/del&gt;&lt;/a&gt; On term mismatch do not invoke the getDatabase callback under mutex`&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 75dc5684d4c6be0e8ac7c653f5389df9f45f1baf)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3c4de4cae84a648e4a55a2b9cbef57b25a68cc0d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3c4de4cae84a648e4a55a2b9cbef57b25a68cc0d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2315323" author="xgen-internal-githook" created="Mon, 8 Jul 2019 15:11:58 +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-41866&quot; title=&quot;Reverse mutex acquisition order in CatalogCache::_scheduleDatabaseRefresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41866&quot;&gt;&lt;del&gt;SERVER-41866&lt;/del&gt;&lt;/a&gt; On term mismatch do not invoke the getDatabase callback under mutex`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/75dc5684d4c6be0e8ac7c653f5389df9f45f1baf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/75dc5684d4c6be0e8ac7c653f5389df9f45f1baf&lt;/a&gt;&lt;/p&gt;</comment>
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