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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-46664] runCmdOnPrimaryAndAwaitResponse() should not run DBDirect client command with the rstl lock held.</title>
                <link>https://jira.mongodb.org/browse/SERVER-46664</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently runCmdOnPrimaryAndAwaitResponse() takes RSTL lock in IX mode and performs DBDirectClient command using AlternativeClientRegion. If the DBDirectClient command takes RSTL lock in the AlternativeClientRegion&apos;s opCtx, then it can lead to deadlock involving the stepdown thread and the thread that calls runCmdOnPrimaryAndAwaitResponse().&lt;br/&gt;
The reason for the deadlock is that, the stepdown thread can&apos;t acquire RSTL lock as the caller&apos;s original opCtx (including locks) has been stashed and replaced with a new opCtx by runCmdOnPrimaryAndAwaitResponse() using AlternativeClientRegion class. So, no way stepdown can interrupt and make the original opCtx to release the locks. As a result, StepDown thread gets blocked behind runCmdOnPrimaryAndAwaitResponse() RSTL lock due to lock conflict . DBDirectClient command gets blocked behind stepdown as stepdown has enqueued the RSTL lock in X mode. And, runCmdOnPrimaryAndAwaitResponse() will be waiting for the DBDirectClient command&apos;s response.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1234217">SERVER-46664</key>
            <summary>runCmdOnPrimaryAndAwaitResponse() should not run DBDirect client command with the rstl lock held.</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Mar 2020 20:28:00 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:11 +0000</updated>
                            <resolved>Mon, 9 Mar 2020 15:29:19 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2968592" author="xgen-internal-githook" created="Wed, 11 Mar 2020 18:46:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Suganthi Mani&apos;, &apos;username&apos;: &apos;smani87&apos;, &apos;email&apos;: &apos;suganthi.mani@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46664&quot; title=&quot;runCmdOnPrimaryAndAwaitResponse() should not run DBDirect client command with the rstl lock held.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46664&quot;&gt;&lt;del&gt;SERVER-46664&lt;/del&gt;&lt;/a&gt; runCmdOnPrimaryAndAwaitResponse() should not run DBDirect client command with the rstl lock held.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 997841bdace7ff9ed5fd5bd0f952ec20880b9d92)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5b01fd594e0b75182c212f39c59d25d15d92bc0b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5b01fd594e0b75182c212f39c59d25d15d92bc0b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2953497" author="xgen-internal-githook" created="Mon, 9 Mar 2020 15:04:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Suganthi Mani&apos;, &apos;username&apos;: &apos;smani87&apos;, &apos;email&apos;: &apos;suganthi.mani@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46664&quot; title=&quot;runCmdOnPrimaryAndAwaitResponse() should not run DBDirect client command with the rstl lock held.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46664&quot;&gt;&lt;del&gt;SERVER-46664&lt;/del&gt;&lt;/a&gt; runCmdOnPrimaryAndAwaitResponse() should not run DBDirect client command with the rstl lock held.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/997841bdace7ff9ed5fd5bd0f952ec20880b9d92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/997841bdace7ff9ed5fd5bd0f952ec20880b9d92&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1234216">SERVER-46663</issuekey>
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