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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-76197] Lock-free reads on a shard secondary node can mismatch the storage snapshot and shard version</title>
                <link>https://jira.mongodb.org/browse/SERVER-76197</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Lock-free reads first &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9fae6f63e917c33d6b4bee6d57446a3b6111b96a/src/mongo/db/db_raii.cpp#L1337-L1341&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;open a storage engine snapshot&lt;/a&gt; and later &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9fae6f63e917c33d6b4bee6d57446a3b6111b96a/src/mongo/db/db_raii.cpp#L1454&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;check that the shard version&lt;/a&gt; the router sent matches the installed one. Because there&apos;s no shardVersion check before opening the snapshot, the snapshot could correspond to a different sharding placement. This will cause the query to not notice a placement mismatch or to be executed with a sharding filter that does not match the storage engine snapshot.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2316451">SERVER-76197</key>
            <summary>Lock-free reads on a shard secondary node can mismatch the storage snapshot and shard version</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                            <label>PM-2144-Milestone-0</label>
                    </labels>
                <created>Mon, 17 Apr 2023 15:44:26 +0000</created>
                <updated>Fri, 27 Oct 2023 20:44:48 +0000</updated>
                            <resolved>Fri, 21 Jul 2023 14:22:51 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5582840" author="JIRAUSER1257318" created="Fri, 21 Jul 2023 14:22:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78832&quot; title=&quot;AutoGetCollectionForReadLockFree constructor should check the shard version when setting shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78832&quot;&gt;&lt;del&gt;SERVER-78832&lt;/del&gt;&lt;/a&gt; fixed this.&lt;/p&gt;</comment>
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                            <attachment id="443360" name="repro-76197.patch" size="5614" author="jordi.serra-torrens@mongodb.com" created="Mon, 17 Apr 2023 18:26:08 +0000"/>
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