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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-60451] Index builds code can access an invalid BSONObj because the cursor was saved&amp;restored at a lower level</title>
                <link>https://jira.mongodb.org/browse/SERVER-60451</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e76b270a58dabd46b0a29f937fc9548f7bc0044e/src/mongo/db/catalog/multi_index_block.cpp#L605-L611&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;objToIndex BSONObj&lt;/a&gt; is pointing to a cursor, which can be saved/restored and no longer save the data to which objToIndex points. Save/restore was exercised further down the stack, because we were running a createIndex command on two indexes at once, so &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e76b270a58dabd46b0a29f937fc9548f7bc0044e/src/mongo/db/catalog/multi_index_block.cpp#L652-L658&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this loop&lt;/a&gt; further down the stack with a reference to objToIndex can hit a WCE, save/restore the cursor, and then keep trying to use the now invalid objToIndex/doc BSONObj for the second index.&lt;/p&gt;

&lt;p&gt;Recommendations: call getOwned() to assign a copy in objToIndex; or, update the objToIndex reference in the same lambda that restores the cursor.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1889529">SERVER-60451</key>
            <summary>Index builds code can access an invalid BSONObj because the cursor was saved&amp;restored at a lower level</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 Oct 2021 19:54:00 +0000</created>
                <updated>Sun, 29 Oct 2023 21:47:50 +0000</updated>
                            <resolved>Tue, 5 Oct 2021 20:15:20 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>5.0.4</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4110140" author="xgen-internal-githook" created="Thu, 7 Oct 2021 13:58:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60451&quot; title=&quot;Index builds code can access an invalid BSONObj because the cursor was saved&amp;amp;restored at a lower level&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60451&quot;&gt;&lt;del&gt;SERVER-60451&lt;/del&gt;&lt;/a&gt; Copy BSON before saving and restoring a cursor around index build side table writes&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0300f19cd738e58cdeaa88b7406a2f38718b0ad9)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a3836f36f60ed692824bf444eaecc1704fdd57fb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a3836f36f60ed692824bf444eaecc1704fdd57fb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4103689" author="xgen-internal-githook" created="Tue, 5 Oct 2021 20:58:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60451&quot; title=&quot;Index builds code can access an invalid BSONObj because the cursor was saved&amp;amp;restored at a lower level&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60451&quot;&gt;&lt;del&gt;SERVER-60451&lt;/del&gt;&lt;/a&gt; Copy BSON before saving and restoring a cursor around index build side table writes&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0300f19cd738e58cdeaa88b7406a2f38718b0ad9)&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ec4438e4bd2f69fc4fa73b9123b0c7e06c28ab6f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ec4438e4bd2f69fc4fa73b9123b0c7e06c28ab6f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4103526" author="xgen-internal-githook" created="Tue, 5 Oct 2021 20:00:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60451&quot; title=&quot;Index builds code can access an invalid BSONObj because the cursor was saved&amp;amp;restored at a lower level&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60451&quot;&gt;&lt;del&gt;SERVER-60451&lt;/del&gt;&lt;/a&gt; Copy BSON before saving and restoring a cursor around index build side table writes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0300f19cd738e58cdeaa88b7406a2f38718b0ad9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0300f19cd738e58cdeaa88b7406a2f38718b0ad9&lt;/a&gt;&lt;/p&gt;</comment>
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