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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-43886] Check if the index was dropped after locking the weak_ptr to the IndexCatalogEntry in RequiresIndexStage and RequiresAllIndicesStage</title>
                <link>https://jira.mongodb.org/browse/SERVER-43886</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While working on the background validation project, it came to my attention that requires_index_stage.h holds a weak_ptr to a shared_ptr of IndexCatalogEntry. This is used to detect when the underlying index entry has been destroyed.&lt;/p&gt;

&lt;p&gt;However, background collection validation holds a shared_ptr to the IndexCatalogEntries it&#8217;s validating even when they&#8217;ve been removed from the IndexCatalog while periodically yielding locks during validation.&lt;/p&gt;

&lt;p&gt;This seems unsafe for requires_index_stage.h to rely on a weak_ptr now. I was thinking if we should change the weak_ptr to a shared_ptr and check the isDropped() flag on the IndexCatalogEntry that was added as part of the background validation project &lt;a href=&quot;https://github.com/mongodb/mongo/commit/4acaa3f536fe2f3fc2355c7a3e860663201c6f37&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="964693">SERVER-43886</key>
            <summary>Check if the index was dropped after locking the weak_ptr to the IndexCatalogEntry in RequiresIndexStage and RequiresAllIndicesStage</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Oct 2019 16:59:52 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:19 +0000</updated>
                            <resolved>Thu, 10 Oct 2019 22:41:20 +0000</resolved>
                                    <version>4.3.1</version>
                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Querying</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2476427" author="xgen-internal-githook" created="Thu, 10 Oct 2019 19:58:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43886&quot; title=&quot;Check if the index was dropped after locking the weak_ptr to the IndexCatalogEntry in RequiresIndexStage and RequiresAllIndicesStage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43886&quot;&gt;&lt;del&gt;SERVER-43886&lt;/del&gt;&lt;/a&gt; Check if the index was dropped after locking the weak_ptr to the IndexCatalogEntry in RequiresIndexStage and RequiresAllIndicesStage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c4b5fd5f87de0ba8ffeaf86388f244a4a294c504&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c4b5fd5f87de0ba8ffeaf86388f244a4a294c504&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2472272" author="david.storch" created="Tue, 8 Oct 2019 19:26:32 +0000"  >&lt;p&gt;We believe that this was a regression introduced in 4.3 development. However, if the background validation work gets backported, then this fix must get backported too.&lt;/p&gt;</comment>
                            <comment id="2471955" author="charlie.swanson" created="Tue, 8 Oct 2019 17:02:24 +0000"  >&lt;p&gt;One clarification: It certainly seems like we should be checking &apos;isDropped()&apos; here, but is the weak pointer really a problem? Should a yielded query really prevent the destruction of the IndexCatalogEntry? I&apos;m happy either way but I don&apos;t see the motivation for changing it.&lt;/p&gt;</comment>
                            <comment id="2471947" author="gregory.wlodarek" created="Tue, 8 Oct 2019 17:00:49 +0000"  >&lt;p&gt;Clarification from Slack: background validation holds shared_ptrs to IndexCatalogEntries even if they&apos;ve been dropped. So if the index is dropped and validation was running, the shared_ptr would still exist even though the index was dropped.&lt;/p&gt;</comment>
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