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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-41036] Make ReadWriteAbility::_canAcceptNonLocalWrites AtomicWord&lt;bool&gt; to prevent torn reads.</title>
                <link>https://jira.mongodb.org/browse/SERVER-41036</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, we are &lt;b&gt;accessing&lt;/b&gt; &lt;b&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/cf322abb3069b05e6ea32afe53a31381f0c0c6df/src/mongo/db/repl/replication_coordinator_impl.h#L684&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_canAcceptNonLocalWrites&lt;/a&gt;&lt;/b&gt; &lt;b&gt;in an unsafe manner by NOT taking any RSTL lock.&lt;/b&gt; &#160;This can lead to torn read/ undefined behavior if concurrently a step up/step down thread is modifying the value.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;service_entry_point_common.cpp - &lt;a href=&quot;https://github.com/mongodb/mongo/blob/79d96979125e9aaa53774a4e1767b1eb231031a9/src/mongo/db/service_entry_point_common.cpp#L585&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;b&gt;execCommandDatabase&lt;/b&gt;&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/79d96979125e9aaa53774a4e1767b1eb231031a9/src/mongo/db/service_entry_point_common.cpp#L667&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;line 667.&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/79d96979125e9aaa53774a4e1767b1eb231031a9/src/mongo/db/service_entry_point_common.cpp#L691&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;line 691.&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Command_can_run_here.cpp - &lt;a href=&quot;https://github.com/mongodb/mongo/blob/79d96979125e9aaa53774a4e1767b1eb231031a9/src/mongo/db/command_can_run_here.cpp#L45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;commandCanRunHere&lt;/a&gt;. And, below are the callers.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/79d96979125e9aaa53774a4e1767b1eb231031a9/src/mongo/db/commands/explain_cmd.cpp#L102&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Explain cmd.&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/79d96979125e9aaa53774a4e1767b1eb231031a9/src/mongo/db/service_entry_point_common.cpp#L678&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;execCommandDatabase.&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;And, they all are best effort checks. So, it&apos;s ok to just make&#160;reading _canAcceptNonLocalWrites thread safe.&lt;/p&gt;</description>
                <environment></environment>
        <key id="759619">SERVER-41036</key>
            <summary>Make ReadWriteAbility::_canAcceptNonLocalWrites AtomicWord&lt;bool&gt; to prevent torn reads.</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="vesselina.ratcheva@mongodb.com">Vesselina Ratcheva</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 May 2019 14:50:31 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:16 +0000</updated>
                            <resolved>Thu, 9 May 2019 17:35:40 +0000</resolved>
                                                    <fixVersion>3.4.22</fixVersion>
                    <fixVersion>3.6.14</fixVersion>
                    <fixVersion>4.1.12</fixVersion>
                    <fixVersion>4.0.11</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2320008" author="xgen-internal-githook" created="Wed, 10 Jul 2019 19:10:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41036&quot; title=&quot;Make ReadWriteAbility::_canAcceptNonLocalWrites AtomicWord&amp;lt;bool&amp;gt; to prevent torn reads.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41036&quot;&gt;&lt;del&gt;SERVER-41036&lt;/del&gt;&lt;/a&gt; Make ReadWriteAbility::_canAcceptNonLocalWrites an AtomicWord&amp;lt;bool&amp;gt;&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 21746d3302f37a9d5716c2f249b99d7f0e273344)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/79d6588c61d60627e015cab590026dc08b0f1c50&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/79d6588c61d60627e015cab590026dc08b0f1c50&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2319976" author="xgen-internal-githook" created="Wed, 10 Jul 2019 18:53:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41036&quot; title=&quot;Make ReadWriteAbility::_canAcceptNonLocalWrites AtomicWord&amp;lt;bool&amp;gt; to prevent torn reads.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41036&quot;&gt;&lt;del&gt;SERVER-41036&lt;/del&gt;&lt;/a&gt; Make ReadWriteAbility::_canAcceptNonLocalWrites an AtomicWord&amp;lt;bool&amp;gt;&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 21746d3302f37a9d5716c2f249b99d7f0e273344)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c3477b307f27c3a7be957c5475eeebdc51140c10&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c3477b307f27c3a7be957c5475eeebdc51140c10&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2319930" author="xgen-internal-githook" created="Wed, 10 Jul 2019 18:26:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41036&quot; title=&quot;Make ReadWriteAbility::_canAcceptNonLocalWrites AtomicWord&amp;lt;bool&amp;gt; to prevent torn reads.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41036&quot;&gt;&lt;del&gt;SERVER-41036&lt;/del&gt;&lt;/a&gt; Make ReadWriteAbility::_canAcceptNonLocalWrites an AtomicWord&amp;lt;bool&amp;gt;&lt;/p&gt;

&lt;p&gt;(cherry-picked from commit 21746d3302f37a9d5716c2f249b99d7f0e273344)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c91ee22877d56754df99563673bed49e59c6007c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c91ee22877d56754df99563673bed49e59c6007c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2240241" author="xgen-internal-githook" created="Thu, 9 May 2019 17:32:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41036&quot; title=&quot;Make ReadWriteAbility::_canAcceptNonLocalWrites AtomicWord&amp;lt;bool&amp;gt; to prevent torn reads.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41036&quot;&gt;&lt;del&gt;SERVER-41036&lt;/del&gt;&lt;/a&gt; Make ReadWriteAbility::_canAcceptNonLocalWrites an AtomicWord&amp;lt;bool&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/21746d3302f37a9d5716c2f249b99d7f0e273344&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/21746d3302f37a9d5716c2f249b99d7f0e273344&lt;/a&gt;&lt;/p&gt;</comment>
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