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    <title>MongoDB Jira</title>
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    <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-85790] Innocuous change in jstests/libs/optimizer_utils.js causes consistent system failures</title>
                <link>https://jira.mongodb.org/browse/SERVER-85790</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;(Ticket based on a &lt;a href=&quot;https://mongodb.slack.com/archives/C0V896UV8/p1706288632953899&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Slack thread&lt;/a&gt;.)&lt;/p&gt;

&lt;p&gt;I&apos;ve consistently gotten system failures for &lt;tt&gt;version_burn_in_gen&lt;/tt&gt; on a series of (what I think) as simple JS test changes:&lt;br/&gt;
&lt;a href=&quot;https://spruce.mongodb.com/version/65b2b23861837d702a8a1cb3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;1&lt;/a&gt; &lt;a href=&quot;https://spruce.mongodb.com/version/65b2e84aa4cf478978ff04b8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;2&lt;/a&gt; &lt;a href=&quot;https://spruce.mongodb.com/version/65b2f22fd1fe076fed3e06d1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;3&lt;/a&gt; &lt;a href=&quot;https://spruce.mongodb.com/version/65b2f8da0305b96cfc86580d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;4&lt;/a&gt; &lt;a href=&quot;https://spruce.mongodb.com/version/65b2fe313627e06e81b77c0d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;5&lt;/a&gt; &lt;a href=&quot;https://spruce.mongodb.com/version/65b31ad5e3c33176f5ab3777&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;6&lt;/a&gt; &lt;a href=&quot;https://spruce.mongodb.com/version/65b32e27d6d80a9364171751&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;7&lt;/a&gt; &lt;a href=&quot;https://spruce.mongodb.com/version/65b32e513627e06e81b7ecae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;8&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In questioning my sanity, I also ran a patch against the &lt;a href=&quot;https://spruce.mongodb.com/version/65b3094732f41769b7ef72ec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;base&lt;/a&gt; commit, which completes without error.&lt;/p&gt;

&lt;p&gt;Eventually, I landed on &lt;a href=&quot;https://spruce.mongodb.com/version/65b32e27d6d80a9364171751/changes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this diff&lt;/a&gt; as being a minimal reproduction of the system failure... but for the life of me, I can&apos;t figure out why. That &lt;a href=&quot;https://spruce.mongodb.com/version/65b3e16a2fbabe3bce37502c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; patch and &lt;a href=&quot;https://spruce.mongodb.com/version/65b3e7e3c9ec44d729df209a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this other&lt;/a&gt; patch both pass &lt;tt&gt;version_burn_in_gen&lt;/tt&gt; adds to my suspicion that the change to &lt;tt&gt;jstests/libs/optimizer_utils.js&lt;/tt&gt; is the culprit&lt;/p&gt;

&lt;p&gt;Does anyone have insight into this? This seems like a pretty big nuisance at minimum, a potentially serious bug at worst.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2558637">SERVER-85790</key>
            <summary>Innocuous change in jstests/libs/optimizer_utils.js causes consistent system failures</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="jacob.evans@mongodb.com">Jacob Evans</assignee>
                                    <reporter username="william.qian@mongodb.com">William Qian</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Jan 2024 17:29:57 +0000</created>
                <updated>Thu, 1 Feb 2024 23:31:18 +0000</updated>
                            <resolved>Thu, 1 Feb 2024 23:31:17 +0000</resolved>
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