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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-82736] [BF-30666] sbe::UnwindStage does not correctly handle child yields</title>
                <link>https://jira.mongodb.org/browse/SERVER-82736</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is a previously existing latent bug that has been exposed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80563&quot; title=&quot;Push $unwind aggregation stage down to SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80563&quot;&gt;&lt;del&gt;SERVER-80563&lt;/del&gt;&lt;/a&gt;, where sbe::UnwindStage does not correctly handle child yields and thus references memory (in &lt;b&gt;UnwindStage::_inArrayAccessor&lt;/b&gt;) owned by a WiredTiger cursor that has been freed after a child yield event.&lt;/p&gt;

&lt;p&gt;Apparently the prior internal uses of sbe::UnwindStage (e.g. in the SBE $lookup implementation) did not have the possibility of a child yielding under this stage, so the yield code paths were not exercised before. It looks like the bug has been latent for ~3 years.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2489614">SERVER-82736</key>
            <summary>[BF-30666] sbe::UnwindStage does not correctly handle child yields</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="kevin.cherkauer@mongodb.com">Kevin Cherkauer</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Nov 2023 21:08:02 +0000</created>
                <updated>Tue, 14 Nov 2023 21:32:31 +0000</updated>
                            <resolved>Sat, 11 Nov 2023 00:08:20 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                    <fixVersion>7.2.0-rc2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5880241" author="xgen-internal-githook" created="Tue, 14 Nov 2023 21:09:03 +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-82736&quot; title=&quot;[BF-30666] sbe::UnwindStage does not correctly handle child yields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82736&quot;&gt;&lt;del&gt;SERVER-82736&lt;/del&gt;&lt;/a&gt; Fix sbe::UnwindStage yield handling to not use freed memory&lt;br/&gt;
Branch: v7.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5ed10c76ee46c24137b6d38f387535cd48b53d4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5ed10c76ee46c24137b6d38f387535cd48b53d4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5872683" author="xgen-internal-githook" created="Sat, 11 Nov 2023 00:01:07 +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-82736&quot; title=&quot;[BF-30666] sbe::UnwindStage does not correctly handle child yields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82736&quot;&gt;&lt;del&gt;SERVER-82736&lt;/del&gt;&lt;/a&gt; Fix sbe::UnwindStage yield handling to not use freed memory&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0a729cd810108699045473797e6127fb9d0eb997&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0a729cd810108699045473797e6127fb9d0eb997&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5850947" author="JIRAUSER1270811" created="Thu, 2 Nov 2023 21:48:26 +0000"  >&lt;p&gt;The failing test &lt;b&gt;jstests/aggregation/bugs/server5932.js --suite=aggregation_auth&lt;/b&gt; of memory accessed after being freed passes when run locally on a non-ASAN build but the failure reproduces with an ASAN build:&lt;/p&gt;
&lt;p/&gt;
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					&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;build/install/bin/resmoke.py run --dbpathPrefix ~/data \&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&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;   --mongodSetParameters=&quot;{featureFlagSbeFull: true}&quot; \&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;   --suite=aggregation_auth \&lt;/span&gt;&lt;/pre&gt;
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					&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;  jstests/aggregation/bugs/server5932.js&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
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