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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-47515] Skip config validation if contents have not changed to avoid isSelf call during reconfig on step up</title>
                <link>https://jira.mongodb.org/browse/SERVER-47515</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We currently &lt;a href=&quot;https://github.com/mongodb/mongo/blob/88c3019bb204ac8a5f30304c7e94f09d30a5d0c8/src/mongo/db/repl/replication_coordinator_impl.cpp#L1124-L1158&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;hold the RSTL&lt;/a&gt; while doing a reconfig on step up after drain mode completion. This can lead to a deadlock since we call isSelf when we are &lt;a href=&quot;https://github.com/mongodb/mongo/blob/88c3019bb204ac8a5f30304c7e94f09d30a5d0c8/src/mongo/db/repl/repl_set_config_checks.cpp#L53-L60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checking for ourselves&lt;/a&gt; in the config during config validation. This isSelf call may try to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0b1bd1ac75787ce46523cab72cedb7715522014e/src/mongo/db/repl/isself.cpp#L214&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;authenticate via a DBClientConnection call&lt;/a&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b2493375543cb89b020f224a1759c1f4d40aa638/src/mongo/db/auth/authz_session_external_state_d.cpp#L49-L54&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;which&lt;/a&gt; can trigger a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0f7625b5cdbc24ed0fce1e168059118cb025d869/src/mongo/db/auth/authz_manager_external_state_d.cpp#L77-L84&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;find on a collection&lt;/a&gt; that takes a MODE_IS lock. This conflicts with the RSTL and deadlocks. &lt;/p&gt;

&lt;p&gt;To avoid this we can skip config validation and the call to isSelf if the contents of the config (everything except version/term) have not changed, since the step up reconfig doesn&apos;t change the contents of the config.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1313535">SERVER-47515</key>
            <summary>Skip config validation if contents have not changed to avoid isSelf call during reconfig on step up</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="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                            <label>safe-reconfig-related</label>
                    </labels>
                <created>Mon, 13 Apr 2020 20:26:52 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:34 +0000</updated>
                            <resolved>Tue, 28 Apr 2020 00:36:26 +0000</resolved>
                                    <version>4.4.0-rc0</version>
                    <version>4.5.1</version>
                                    <fixVersion>4.4.0-rc4</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3059430" author="xgen-internal-githook" created="Tue, 28 Apr 2020 20:30:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47515&quot; title=&quot;Skip config validation if contents have not changed to avoid isSelf call during reconfig on step up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47515&quot;&gt;&lt;del&gt;SERVER-47515&lt;/del&gt;&lt;/a&gt; Avoid finding self on replica set reconfig if config contents have not changed&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 83f98c05609c4559dfdaf384c5512b0100a9e1b5)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e33cb0c81df6901645788f1df484c2d492c08b1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e33cb0c81df6901645788f1df484c2d492c08b1f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3057731" author="xgen-internal-githook" created="Tue, 28 Apr 2020 00:25:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47515&quot; title=&quot;Skip config validation if contents have not changed to avoid isSelf call during reconfig on step up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47515&quot;&gt;&lt;del&gt;SERVER-47515&lt;/del&gt;&lt;/a&gt; Avoid finding self on replica set reconfig if config contents have not changed&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/83f98c05609c4559dfdaf384c5512b0100a9e1b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/83f98c05609c4559dfdaf384c5512b0100a9e1b5&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1315180">SERVER-47545</issuekey>
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