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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-84730] It&apos;s unsafe to reuse OpCtx for multiple operations when queryStats is concurrently disabled</title>
                <link>https://jira.mongodb.org/browse/SERVER-84730</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The fuzzer found this problem via the FTDC background thread which appears to run a couple back-to-back aggregation commands using the same OperationContext. What seems to be happening is the following:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;FTDC thread begins, and issues one aggregation which successfully records query stats.&lt;/li&gt;
	&lt;li&gt;Another thread disables query stats by setting the cache size to 0.&lt;/li&gt;
	&lt;li&gt;(back in FTDC) With&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/bcff594b195b48c6ceca0f97ad825ef736277ec5/src/mongo/db/ftdc/collector.cpp#L69-L73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the same OperationContext, but a different collector&lt;/a&gt;, we run a second aggregate.&lt;/li&gt;
	&lt;li&gt;This second aggregate shares the old OperationContext (and CurOp, and OpDebug) which still has a query stats key&#160;&lt;em&gt;hash&lt;/em&gt;&#160;on it, but will never have a query stats key, because query stats has been disabled.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;This doesn&apos;t cause too much trouble, it just causes us to miss that one recording for FTDC. The thread can continue without crashing or anything.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2542393">SERVER-84730</key>
            <summary>It&apos;s unsafe to reuse OpCtx for multiple operations when queryStats is concurrently disabled</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>qi-query-stats</label>
                    </labels>
                <created>Wed, 10 Jan 2024 17:54:10 +0000</created>
                <updated>Mon, 22 Jan 2024 21:42:08 +0000</updated>
                            <resolved>Mon, 22 Jan 2024 21:42:07 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="6031827" author="xgen-internal-githook" created="Mon, 22 Jan 2024 19:06:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84730&quot; title=&quot;It&amp;#39;s unsafe to reuse OpCtx for multiple operations when queryStats is concurrently disabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84730&quot;&gt;&lt;del&gt;SERVER-84730&lt;/del&gt;&lt;/a&gt; Update query stats assertions (#18043)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 0766fb001ac394aec4410d27276d1721fb72ff8a&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/04c36b7c059bb2807f2a2dde9ff63d87e44285eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/04c36b7c059bb2807f2a2dde9ff63d87e44285eb&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2550490">SERVER-85405</issuekey>
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