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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-70634] Add protection to _implicitDefaultWriteConcernMajority</title>
                <link>https://jira.mongodb.org/browse/SERVER-70634</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It is possible for a race on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9d5bb60d991c246700db2dc1d619b7d72dcaf7e4/src/mongo/db/read_write_concern_defaults.h#L212&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;_implicitDefaultWriteConcernMajority&lt;/tt&gt;&lt;/a&gt; to occur between the replication coordinator, which is setting the read / write concern settings on start up etc. and the &lt;tt&gt;GetDefaultRWConcernCommand&lt;/tt&gt; command.&lt;/p&gt;

&lt;p&gt;We should prevent this race by protecting that variable with a mutex. See my comment for more info.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2160685">SERVER-70634</key>
            <summary>Add protection to _implicitDefaultWriteConcernMajority</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="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="vishnu.kaushik@mongodb.com">Vishnu Kaushik</reporter>
                        <labels>
                            <label>repl-shortlist</label>
                            <label>tsan</label>
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                <created>Mon, 17 Oct 2022 17:19:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:31:50 +0000</updated>
                            <resolved>Tue, 3 Jan 2023 02:15:01 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5061420" author="xgen-internal-githook" created="Fri, 16 Dec 2022 21:24:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70634&quot; title=&quot;Add protection to _implicitDefaultWriteConcernMajority&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70634&quot;&gt;&lt;del&gt;SERVER-70634&lt;/del&gt;&lt;/a&gt;: Fix data race in _implicitDefaultWriteConcernMajority&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c201da20671a73b78593ff4cf9b21fa04973004c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c201da20671a73b78593ff4cf9b21fa04973004c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4907729" author="vishnu.kaushik" created="Mon, 17 Oct 2022 17:23:14 +0000"  >&lt;p&gt;Requesting a backport up to 5.0 - I don&apos;t see this variable in 4.4.&lt;/p&gt;</comment>
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