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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-82167] $regex may use unbounded cpu and memory</title>
                <link>https://jira.mongodb.org/browse/SERVER-82167</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once the server admits a regular expression operation and hands it over the PCRE engine we no longer have control over its resource utilization. This can break the cloud QoS implementation by preventing feedback from the mongod from being integrated in request throttling in the router, but also may result in a noisy neighbor problem on the mongod.&lt;/p&gt;

&lt;p&gt;Two possible mitigations were discussed:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Perform regex matching on a dedicated thread with a low priority (see &lt;a href=&quot;https://man7.org/linux/man-pages/man2/nice.2.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;nice&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;Use &#160;&lt;a href=&quot;https://man7.org/linux/man-pages/man3/pcre2_set_match_limit.3.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;pcre2_set_match_limit&lt;/a&gt; to &quot;page&quot; regex results. Each time we reach a limit would be an opportunity to yield the matching to re-engage with execution control&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2473650">SERVER-82167</key>
            <summary>$regex may use unbounded cpu and memory</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="11262" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Investigating</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="shameek.ray@mongodb.com">Shameek Ray</assignee>
                                    <reporter username="matt.broadstone@mongodb.com">Matt Broadstone</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Oct 2023 11:24:56 +0000</created>
                <updated>Tue, 17 Oct 2023 20:16:01 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>9</watches>
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            <issuekey id="291127">SERVER-24375</issuekey>
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