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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-41803] Standalone server crash with &apos;Unique index cursor seeing multiple records for key { : null } &apos;</title>
                <link>https://jira.mongodb.org/browse/SERVER-41803</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongo server crashes when it sees multiple records for key &apos;null&apos; in an unique index. It won&apos;t restart unless the systemd service has endless respawn configured.&lt;/p&gt;</description>
                <environment></environment>
        <key id="805791">SERVER-41803</key>
            <summary>Standalone server crash with &apos;Unique index cursor seeing multiple records for key { : null } &apos;</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="3">Duplicate</resolution>
                                        <assignee username="daniel.hatcher@mongodb.com">Danny Hatcher</assignee>
                                    <reporter username="h-line">Lauri H&#228;linen</reporter>
                        <labels>
                    </labels>
                <created>Tue, 18 Jun 2019 06:42:20 +0000</created>
                <updated>Tue, 18 Jun 2019 14:57:11 +0000</updated>
                            <resolved>Tue, 18 Jun 2019 14:57:11 +0000</resolved>
                                    <version>4.0.4</version>
                    <version>4.0.10</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2288498" author="daniel.hatcher" created="Tue, 18 Jun 2019 14:56:54 +0000"  >&lt;p&gt;Glad to hear it! I&apos;ll close this ticket as a duplicate but please let us know if you see the issue again.&lt;/p&gt;</comment>
                            <comment id="2288390" author="h-line" created="Tue, 18 Jun 2019 13:53:59 +0000"  >&lt;p&gt;I actually already rebuilt the indexes and removed all the documents without the indexed fields. After that the server did not crash with the specified query. Good to know that it&apos;s been fixed already.&lt;/p&gt;</comment>
                            <comment id="2288380" author="daniel.hatcher" created="Tue, 18 Jun 2019 13:48:30 +0000"  >&lt;p&gt;It is likely that you are encountering &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41213&quot; title=&quot;Unique background index builds may produce inconsistent keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41213&quot;&gt;&lt;del&gt;SERVER-41213&lt;/del&gt;&lt;/a&gt;. It was resolved going forward in 4.0.10 but you will still need to rebuild the broken indexes. Can you please do so and let me know if you still see the problem?&lt;/p&gt;</comment>
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