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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>
    </build-info>


<item>
            <title>[SERVER-28251] Fix race condition in index_killop.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-28251</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;index_killop.js uses the &apos;hangAfterStartingIndexBuild&apos; fail point in order to freeze an index build in-flight and allow for the build to be killed via killop. Execution of the killop depends on a call to &apos;checkForInterrupt()&apos; from within the fail point block to allow the killop to execute. As implemented it is possible for index_killop.js to fail in the following scenario:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The hangAfterStartingIndexBuild failpoint is activated&lt;/li&gt;
	&lt;li&gt;Index build starts, entry appears in curop&lt;/li&gt;
	&lt;li&gt;The test detects the running index build and kills the op (which flags it for kill at next interrupt check).&lt;/li&gt;
	&lt;li&gt;The test deactivates the failpoint&lt;/li&gt;
	&lt;li&gt;the index build hasn&apos;t yet reached the failpoint code yet, so it actually does not perform the failpoint log, the sleep, or, critically, the checkForInterrupt call.&lt;/li&gt;
	&lt;li&gt;The index build completes successfully, because there are no further checkForInterrupt calls.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;To fix we could:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Call &apos;checkForInterrupt()&apos; on each loop of the &apos;hangAfterStartingIndexBuild&apos; failpoint.&lt;/li&gt;
	&lt;li&gt;Move disabling of the &apos;hangAfterStartingIndexBuild&apos; failpoint (in index_killop.js) to after &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.4/jstests/noPassthrough/index_killop.js#L53-L56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;confirmation that the index build has stopped&lt;/a&gt;. This move requires the above change, as otherwise the killop is blocked waiting for a checkForInterrupt call.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;As part of this work we should look to reimplement the &apos;hangAfterStartingIndexBuild&apos; failpoint to be part of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.4/src/mongo/db/catalog/index_create.cpp#L310-L359&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;insert loop&lt;/a&gt;, taking advantage of the checkForInterrupt() call performed there. Removing the failpoint-only call allows us to more closely test real-world behavior.&lt;/p&gt;


&lt;p&gt;Steps to reproduce:&lt;br/&gt;
1. Force the server thread to sleep for 5 seconds before the failpoint checkpoint to simulate the situation when the test runs &apos;faster&apos; than the server. In this case, &lt;b&gt;checkForInterrupt&lt;/b&gt; won&apos;t get executed because the failpoint definitely gets deactivated by the test in this 5-second period.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+ sleepmillis(5000);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if (MONGO_FAIL_POINT(hangAfterStartingIndexBuild)) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // Need the index build to hang before the progress meter is marked as finished so we can&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // reliably check that the index build has actually started in js tests.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    while (MONGO_FAIL_POINT(hangAfterStartingIndexBuild)) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        log() &amp;lt;&amp;lt; &quot;Hanging index build due to &apos;hangAfterStartingIndexBuild&apos; failpoint&quot;;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        sleepmillis(1000);&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // Check for interrupt to allow for killop prior to index build completion.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    _opCtx-&amp;gt;checkForInterrupt();&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="362588">SERVER-28251</key>
            <summary>Fix race condition in index_killop.js</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="9">Done</resolution>
                                        <assignee username="xiangyu.yao@mongodb.com">Xiangyu Yao</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 8 Mar 2017 19:27:24 +0000</created>
                <updated>Tue, 11 Sep 2018 20:40:08 +0000</updated>
                            <resolved>Fri, 10 Nov 2017 21:15:42 +0000</resolved>
                                                    <fixVersion>3.4.18</fixVersion>
                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1999953" author="xgen-internal-githook" created="Tue, 11 Sep 2018 20:31:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Xiangyu Yao&apos;, &apos;email&apos;: &apos;xiangyu.yao@mongodb.com&apos;, &apos;username&apos;: &apos;xy24&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28251&quot; title=&quot;Fix race condition in index_killop.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28251&quot;&gt;&lt;del&gt;SERVER-28251&lt;/del&gt;&lt;/a&gt; Fix race condition in index_killop.js&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6a416de4330d6368ea77bace41e297082e8cf3bd)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ec5ca87650b4e4663b182aa736c523bc585865ec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ec5ca87650b4e4663b182aa736c523bc585865ec&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1723025" author="xgen-internal-githook" created="Fri, 10 Nov 2017 21:14:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Xiangyu Yao&apos;, &apos;username&apos;: &apos;xy24&apos;, &apos;email&apos;: &apos;xiangyu.yao@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28251&quot; title=&quot;Fix race condition in index_killop.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28251&quot;&gt;&lt;del&gt;SERVER-28251&lt;/del&gt;&lt;/a&gt; Fix race condition in index_killop.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6a416de4330d6368ea77bace41e297082e8cf3bd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6a416de4330d6368ea77bace41e297082e8cf3bd&lt;/a&gt;&lt;/p&gt;</comment>
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