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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-57432] Prevent MODE_X and MODE_S locks from being yielded and reacquired</title>
                <link>https://jira.mongodb.org/browse/SERVER-57432</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Callers typically acquire a MODE&amp;#95;X lock to exclude all readers and writers and a MODE&amp;#95;S lock to exclude all writers. Allowing query yielding, hybrid index building, etc. to release and later reacquire these locks can invalidate assumptions about what these internal callers thought acquiring a strong lock meant within the system because it enables other readers and writers to act on the collection.&lt;/p&gt;

&lt;p&gt;We should consider making it a programmer error to use Locker::saveLockStateAndUnlock() and/or Locker::restoreLockState() to yield and reacquire MODE&amp;#95;X and MODE&amp;#95;S locks, or consider making it a programmer error to use PlanYieldPolicy::YieldPolicy::YIELD&amp;#95;AUTO while holding a MODE&amp;#95;X or MODE&amp;#95;S lock. Note: The caller could instead set PlanYieldPolicy::YieldPolicy::NO&amp;#95;YIELD or similar with an intent lock to reflect their intention to not see the effects of other writers if they actually wanted the effects of what yielding and reacquiring strong locks would imply for some reason.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1768556">SERVER-57432</key>
            <summary>Prevent MODE_X and MODE_S locks from being yielded and reacquired</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Jun 2021 06:05:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:40 +0000</updated>
                            <resolved>Tue, 22 Feb 2022 15:02:47 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>1</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="4379704" author="louis.williams" created="Mon, 28 Feb 2022 09:19:08 +0000"  >&lt;p&gt;For what it&apos;s worth, this exposed a bug in rollback-via-refetch yielding the Global X lock: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63992&quot; title=&quot;Make dropCollection in rs_rollback never yield locks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63992&quot;&gt;&lt;del&gt;SERVER-63992&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4368316" author="xgen-internal-githook" created="Tue, 22 Feb 2022 14:53:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57432&quot; title=&quot;Prevent MODE_X and MODE_S locks from being yielded and reacquired&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57432&quot;&gt;&lt;del&gt;SERVER-57432&lt;/del&gt;&lt;/a&gt; Forbid yielding MODE_X/MODE_S locks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a0eb65c457a250baada836c0b6165e93449cd079&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a0eb65c457a250baada836c0b6165e93449cd079&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1953845">SERVER-62172</issuekey>
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            <issuekey id="1766282">SERVER-57358</issuekey>
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            <issuelink>
            <issuekey id="1986382">SERVER-63833</issuekey>
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            <issuelink>
            <issuekey id="2028885">SERVER-65818</issuekey>
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            <issuekey id="1990278">SERVER-63992</issuekey>
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            <issuekey id="2101529">SERVER-68394</issuekey>
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