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    <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-53837] Race of OplogFetcher access in TenantMigrationRecipientServiceTest.OplogApplierFails</title>
                <link>https://jira.mongodb.org/browse/SERVER-53837</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In this &lt;a href=&quot;https://github.com/mongodb/mongo/blob/aaa6470f8e380579e86db9d0d0f5e81faea7e2fa/src/mongo/db/repl/tenant_migration_recipient_service_test.cpp#L1299&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;OplogApplierFails&lt;/tt&gt;&lt;/a&gt; test, we use an &lt;tt&gt;OplogFetcherMock&lt;/tt&gt; to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/aaa6470f8e380579e86db9d0d0f5e81faea7e2fa/src/mongo/db/repl/tenant_migration_recipient_service_test.cpp#L1349-L1350&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;feed an oplog entry that doesn&apos;t belong to the tenant&lt;/a&gt; to test that TenantOplogApplier fails the migration. When failing the migration, the main chain would call &lt;tt&gt;_cleanupOnDataSyncCompletion&lt;/tt&gt; which would &lt;a href=&quot;https://github.com/mongodb/mongo/blob/aaa6470f8e380579e86db9d0d0f5e81faea7e2fa/src/mongo/db/repl/tenant_migration_recipient_service.cpp#L983&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;clean up and free the &lt;tt&gt;_donorOplogFetcher&lt;/tt&gt;&lt;/a&gt;. But this could race with the test thread that calls &lt;tt&gt;oplogFetcher-&amp;gt;receiveBatch&lt;/tt&gt; which could end up accessing freed memory if the &lt;tt&gt;_donorOplogFetcher&lt;/tt&gt; object is freed before the &lt;tt&gt;receiveBatch&lt;/tt&gt; returns.&lt;/p&gt;

&lt;p&gt;To fix this, we could use the &lt;tt&gt;hangBeforeTaskCompletion&lt;/tt&gt; failpoint to hang the main chain before &lt;tt&gt;_cleanupOnDataSyncCompletion&lt;/tt&gt; is run.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1592475">SERVER-53837</key>
            <summary>Race of OplogFetcher access in TenantMigrationRecipientServiceTest.OplogApplierFails</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="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
                            <label>pm-1791_other_required</label>
                    </labels>
                <created>Fri, 15 Jan 2021 18:47:09 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:45 +0000</updated>
                            <resolved>Fri, 22 Jan 2021 17:00:54 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3578148" author="xgen-internal-githook" created="Fri, 22 Jan 2021 17:20:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergey Galtsev&apos;, &apos;email&apos;: &apos;sergey.galtsev@mongodb.com&apos;, &apos;username&apos;: &apos;brushless-glitch&apos;}
&lt;p&gt;Message: master: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53837&quot; title=&quot;Race of OplogFetcher access in TenantMigrationRecipientServiceTest.OplogApplierFails&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53837&quot;&gt;&lt;del&gt;SERVER-53837&lt;/del&gt;&lt;/a&gt;: Fix race of OplogFetcher access in TenantMigrationRecipientServiceTest.OplogApplierFails&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/b2d1ddb3112df766789e34e25a6d3ad0bfa29dad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/b2d1ddb3112df766789e34e25a6d3ad0bfa29dad&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3578094" author="xgen-internal-githook" created="Fri, 22 Jan 2021 16:56:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53837&quot; title=&quot;Race of OplogFetcher access in TenantMigrationRecipientServiceTest.OplogApplierFails&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53837&quot;&gt;&lt;del&gt;SERVER-53837&lt;/del&gt;&lt;/a&gt;: Fix race of OplogFetcher access in TenantMigrationRecipientServiceTest.OplogApplierFails&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/02b4940e6fd5b0ede47da618721b9a70eb5f603a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/02b4940e6fd5b0ede47da618721b9a70eb5f603a&lt;/a&gt;&lt;/p&gt;</comment>
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