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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-54448] Add an invariant to a query yield path, releasing only the storage snapshot, to ensure lock-free reads operations never accidentally use it</title>
                <link>https://jira.mongodb.org/browse/SERVER-54448</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/461350791520a9f092630cbe3520e11dff09b746/src/mongo/db/query/plan_yield_policy_impl.cpp#L72-L73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This bit of code&lt;/a&gt;&#160;calling abandonSnapshot without releasing locks is not currently run by lock-free read operations, but we should make sure that we never accidentally do so without knowing about it. We can add an invariant that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/461350791520a9f092630cbe3520e11dff09b746/src/mongo/db/operation_context.h#L300-L302&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;opCtx-&amp;gt;isLockFreeReadsOp()&lt;/a&gt;&#160;returns false.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1619768">SERVER-54448</key>
            <summary>Add an invariant to a query yield path, releasing only the storage snapshot, to ensure lock-free reads operations never accidentally use it</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="13201">Fixed</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 Feb 2021 17:58:10 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:42 +0000</updated>
                            <resolved>Fri, 23 Apr 2021 14:48:45 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3735685" author="xgen-internal-githook" created="Fri, 23 Apr 2021 14:29:24 +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-54448&quot; title=&quot;Add an invariant to a query yield path, releasing only the storage snapshot, to ensure lock-free reads operations never accidentally use it&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54448&quot;&gt;&lt;del&gt;SERVER-54448&lt;/del&gt;&lt;/a&gt; Add an invariant to a query yield path that calls abandonSnapshot() that the operation is not lock-free&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/494e27692ed98e71158514b118f7178884fb7f08&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/494e27692ed98e71158514b118f7178884fb7f08&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3609823" author="dianna.hohensee" created="Wed, 10 Feb 2021 18:10:46 +0000"  >&lt;p&gt;This is really not a definitive general solution. Ideally, we&apos;d want to somehow ensure that abandonSnapshot() is never called for AutoGet*LockFree instances, except for when we do want to yield locks &#8211; even trickier. It&apos;s unclear to me right now how to achieve that ideal, however. Probably worth some further thought at some point.&lt;/p&gt;</comment>
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