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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-70445] Server crash when reading from sharded collections with user-created &apos;&lt;db&gt;.system.buckets.&lt;coll&gt;&apos; collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-70445</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Users should never create collections with the &apos;system.buckets&apos; prefix. However, today nothing prevents it (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61589&quot; title=&quot;Disallow users from creating collections with &amp;#39;system.buckets&amp;#39; prefix&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61589&quot;&gt;&lt;del&gt;SERVER-61589&lt;/del&gt;&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;On a non time-series sharded collection &amp;lt;dbName&amp;gt;.&amp;lt;collName&amp;gt;, if the user manually creates the &amp;lt;db&amp;gt;system.buckets.&amp;lt;collName&amp;gt; collection, reads on the sharded collections will crash the server. This is because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0406b63884d9993f0eafd7d6dcd680e0ecdc1a1f/src/mongo/db/service_entry_point_common.cpp#L1708-L1713&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this logic&lt;/a&gt; will choose the bucket namespace to install on the OperationShardingState alongside the attached shardVersion. Then, when calling getOwnershipFilter, the namespace &amp;lt;db&amp;gt;.&amp;lt;collName&amp;gt; won&apos;t be found on the OperationShardingState and and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/84c76f3bcaf758158168a91a3283250816f8fb23/src/mongo/db/s/collection_sharding_runtime.cpp#L105-L108&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt; will be tripped.&lt;/p&gt;

&lt;p&gt;One possible fix is to prevent users from creating the buckets collection (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61589&quot; title=&quot;Disallow users from creating collections with &amp;#39;system.buckets&amp;#39; prefix&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61589&quot;&gt;&lt;del&gt;SERVER-61589&lt;/del&gt;&lt;/a&gt;). This tickets is to decide whether to go with that solution, or fix it in some different way.&lt;/p&gt;

&lt;p&gt;Edit: This ticket is to fix the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0406b63884d9993f0eafd7d6dcd680e0ecdc1a1f/src/mongo/db/service_entry_point_common.cpp#L1708-L1711&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;nss rewrite done on service_entry_point&lt;/a&gt; so that looks at the TimeseriesOptions to confirm whether it is really a timeseries collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2156453">SERVER-70445</key>
            <summary>Server crash when reading from sharded collections with user-created &apos;&lt;db&gt;.system.buckets.&lt;coll&gt;&apos; collection</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="rushan.chen@mongodb.com">Rushan Chen</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                            <label>query-director-triage</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Tue, 11 Oct 2022 13:19:41 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:03 +0000</updated>
                            <resolved>Wed, 11 Jan 2023 12:43:09 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="5105622" author="xgen-internal-githook" created="Wed, 11 Jan 2023 12:33:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Rushan Chen&apos;, &apos;email&apos;: &apos;rushan.chen@mongodb.com&apos;, &apos;username&apos;: &apos;ruchen&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70445&quot; title=&quot;Server crash when reading from sharded collections with user-created &amp;#39;&amp;lt;db&amp;gt;.system.buckets.&amp;lt;coll&amp;gt;&amp;#39; collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70445&quot;&gt;&lt;del&gt;SERVER-70445&lt;/del&gt;&lt;/a&gt; check existence of TimeseriesOptions before using the time series bucket collection name space&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37bbca32d5adc3654dff73b94816a7bd56cd9d42&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37bbca32d5adc3654dff73b94816a7bd56cd9d42&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5099027" author="JIRAUSER1259232" created="Mon, 9 Jan 2023 08:50:35 +0000"  >&lt;p&gt;While this ticket solves (1), I agree we should also do (2) above.&#160;&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="1928469">SERVER-61589</issuekey>
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&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sh.shardCollection(&apos;test.foo&apos;, {x:1})&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.system.buckets.foo.insert({a: 1})&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.foo.find()&lt;/span&gt;&lt;/pre&gt;
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