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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-36975] Fix race condition in read_concern_snapshot_catalog_invalidation.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-36975</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In&#160;&lt;tt&gt;read_concern_snapshot_catalog_invalidation.js&lt;/tt&gt;, there is code to&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/23794c14b03bb272daad7a2b25eca0b80c03a31c/jstests/noPassthrough/read_concern_snapshot_catalog_invalidation.js#L18&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wait for an operation to start&lt;/a&gt;. The test is racy because the test assumes that once&#160;&lt;tt&gt;waitForOp()&lt;/tt&gt;&#160;has returned, the operation is hanging on a fail point. This is not necessarily true, and can cause the test to fail if the following happens:&lt;/p&gt;

&lt;p&gt;1) The operation starts, but does not reach the fail point&lt;br/&gt;
 2)&#160;&lt;tt&gt;waitForOp&lt;/tt&gt;&#160;is run,&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/23794c14b03bb272daad7a2b25eca0b80c03a31c/jstests/noPassthrough/read_concern_snapshot_catalog_invalidation.js#L23&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;and returns true&lt;/a&gt;&lt;br/&gt;
 3)&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/23794c14b03bb272daad7a2b25eca0b80c03a31c/jstests/noPassthrough/read_concern_snapshot_catalog_invalidation.js#L62&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;createIndexes&lt;/tt&gt; is run&lt;/a&gt;&lt;br/&gt;
 4) The operation reaches the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/23794c14b03bb272daad7a2b25eca0b80c03a31c/src/mongo/db/transaction_participant.cpp#L518&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fail point&lt;/a&gt; and preallocates a snapshot at a time that includes the new index, so the operation unexpectedly succeeds&lt;/p&gt;</description>
                <environment></environment>
        <key id="599210">SERVER-36975</key>
            <summary>Fix race condition in read_concern_snapshot_catalog_invalidation.js</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Sep 2018 15:39:42 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:28 +0000</updated>
                            <resolved>Wed, 5 Sep 2018 17:39:23 +0000</resolved>
                                                    <fixVersion>4.0.3</fixVersion>
                    <fixVersion>4.1.3</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1994120" author="xgen-internal-githook" created="Wed, 5 Sep 2018 17:40:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36975&quot; title=&quot;Fix race condition in read_concern_snapshot_catalog_invalidation.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36975&quot;&gt;&lt;del&gt;SERVER-36975&lt;/del&gt;&lt;/a&gt; Fix race condition in read_concern_snapshot_catalog_invalidation.js&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0ee0cabe0a12006080521f47ebb43f36205736c7)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1c23962dd2af6da3e6b3a33d3dd1a6097506ceab&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1c23962dd2af6da3e6b3a33d3dd1a6097506ceab&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1994115" author="xgen-internal-githook" created="Wed, 5 Sep 2018 17:39:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36975&quot; title=&quot;Fix race condition in read_concern_snapshot_catalog_invalidation.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36975&quot;&gt;&lt;del&gt;SERVER-36975&lt;/del&gt;&lt;/a&gt; Fix race condition in read_concern_snapshot_catalog_invalidation.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d9b5ba2d1710d7f52536ab9c53c3a68329f61b90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d9b5ba2d1710d7f52536ab9c53c3a68329f61b90&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1993895" author="xgen-internal-githook" created="Wed, 5 Sep 2018 15:38:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36975&quot; title=&quot;Fix race condition in read_concern_snapshot_catalog_invalidation.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36975&quot;&gt;&lt;del&gt;SERVER-36975&lt;/del&gt;&lt;/a&gt; Fix race condition in read_concern_snapshot_catalog_invalidation.js&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit bd982824a7967b5e518bf9255b8f5e051bdaff7d.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/28cef55d81126b04732eaa41ff8b20e45636dde1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/28cef55d81126b04732eaa41ff8b20e45636dde1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1993866" author="xgen-internal-githook" created="Wed, 5 Sep 2018 15:21:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36975&quot; title=&quot;Fix race condition in read_concern_snapshot_catalog_invalidation.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36975&quot;&gt;&lt;del&gt;SERVER-36975&lt;/del&gt;&lt;/a&gt; Fix race condition in read_concern_snapshot_catalog_invalidation.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bd982824a7967b5e518bf9255b8f5e051bdaff7d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bd982824a7967b5e518bf9255b8f5e051bdaff7d&lt;/a&gt;&lt;/p&gt;</comment>
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