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    <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>[CDRIVER-3381] Unsafe to call mongoc_read_concern_append / mongoc_write_concern_append on the same struct from multiple threads</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-3381</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;Conversation with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jmikola&quot; class=&quot;user-hover&quot; rel=&quot;jmikola&quot;&gt;jmikola&lt;/a&gt; revealed that &lt;tt&gt;mongoc_read_concern_append&lt;/tt&gt; and &lt;tt&gt;mongoc_write_concern_append&lt;/tt&gt; may be unsafe to call on the same struct concurrently from multiple threads as the &quot;freeze&quot; functions that get called for these types do not use locks.&lt;/p&gt;

&lt;p&gt;Note this is not a problem for Swift as we don&apos;t call these methods at all, and manually encode our read concern / write concern types to bson_ts instead.&lt;/p&gt;</description>
                <environment></environment>
        <key id="948021">CDRIVER-3381</key>
            <summary>Unsafe to call mongoc_read_concern_append / mongoc_write_concern_append on the same struct from multiple threads</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kaitlin.mahar@mongodb.com">Kaitlin Mahar</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Oct 2019 22:40:34 +0000</created>
                <updated>Fri, 10 Feb 2023 16:07:44 +0000</updated>
                                                                            <component>libmongoc</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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