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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-78103] SBE can crash for $_resumeAfter for clustered collections with null value</title>
                <link>https://jira.mongodb.org/browse/SERVER-78103</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a difference in classic and SBE when running $_resumeAfter with clustered collections where SBE can crash the server (steps to reproduce are below). This will affect all versions that use SBE for clustered collections (right now only 7.1)&lt;/p&gt;

&lt;p&gt;I think this is partially because how SBE and classic handle null input to $_resumeAfter. Classic and SBE return different results for the postBatchResumeToken after all the documents are returned in the collection. When we have no more documents left, classic returns {$recordId: null} and then after returns the first document recordId. SBE just returns the last document recordId again and again. SBE does not return a null value.&lt;/p&gt;

&lt;p&gt;Either both engines should return the same output, or at least SBE should not crash when run with {&apos;$recordId&apos;: null}. This was discovered in another bug investigation (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77386&quot; title=&quot;Make &amp;#39;$_resumeAfter&amp;#39; parameter work with clustered collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77386&quot;&gt;&lt;del&gt;SERVER-77386&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2368431">SERVER-78103</key>
            <summary>SBE can crash for $_resumeAfter for clustered collections with null value</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="kevin.cherkauer@mongodb.com">Kevin Cherkauer</assignee>
                                    <reporter username="gil.alon@mongodb.com">Gil Alon</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Jun 2023 19:16:13 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:02 +0000</updated>
                            <resolved>Thu, 6 Jul 2023 19:44:57 +0000</resolved>
                                    <version>7.1.0-rc0</version>
                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5548656" author="xgen-internal-githook" created="Thu, 6 Jul 2023 19:40:05 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Cherkauer&apos;, &apos;email&apos;: &apos;kevin.cherkauer@mongodb.com&apos;, &apos;username&apos;: &apos;kevin-cherkauer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78103&quot; title=&quot;SBE can crash for $_resumeAfter for clustered collections with null value&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78103&quot;&gt;&lt;del&gt;SERVER-78103&lt;/del&gt;&lt;/a&gt; Fix clustered coll $_resumeAfter: {$recordId: null} in SBE&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c53b81d0d800f7338a7f3f81b9526343fef5f5a1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c53b81d0d800f7338a7f3f81b9526343fef5f5a1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5537721" author="JIRAUSER1270811" created="Fri, 30 Jun 2023 19:03:05 +0000"  >&lt;p&gt;The problem is that in SBE, $_resumeAfter: {$recordId: null} results in a null record ID value coming in through the _seekRecordId slot, which crashes seekExact() as it expects this to be a string.&lt;/p&gt;

&lt;p&gt;The fix is to add a check for this case in scan.cpp ScanStage::getNext().&lt;/p&gt;</comment>
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            <issuekey id="2347604">SERVER-77386</issuekey>
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