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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-5028] Bug in fsync2.js causes RHEL 64bit Nightly to never finish</title>
                <link>https://jira.mongodb.org/browse/SERVER-5028</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I believe there is a bug in jstests/fsync2.js such that the test hangs and blocks future builds from being scheduled. I believe the problematic code is:&lt;/p&gt;

&lt;p/&gt;
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					&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;assert.commandWorked( d.runCommand( {fsync:1, lock: 1 } ) );&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;&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;for ( i=0; i&amp;lt;200; i++) {&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;&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;    assert.eq(1, db.fsync2.count());&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;&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;    sleep(1);&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;
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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;   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;db.fsync2.save( {x:1} );&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;As I understand it, once a database is fsync/locked and a write comes in (the save on the last line), all reads and writes are blocked until the fsync/lock is un-done. Since the Mongo shell does safe-mode writes by default, control will never return to the jstest after the .save() line (it will block indefinitely, or at least seems to be doing so).&lt;/p&gt;

&lt;p&gt;Possibly related cases:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4243&quot; title=&quot;If there is a pending write due to an fsync lock, all reads are blocked&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4243&quot;&gt;&lt;del&gt;SERVER-4243&lt;/del&gt;&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1423&quot; title=&quot;reads often aren&amp;#39;t possible while in fsync and lock mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1423&quot;&gt;&lt;del&gt;SERVER-1423&lt;/del&gt;&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="31137">SERVER-5028</key>
            <summary>Bug in fsync2.js causes RHEL 64bit Nightly to never finish</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="dcrosta">Daniel Crosta</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Feb 2012 18:54:44 +0000</created>
                <updated>Wed, 15 Aug 2012 14:04:17 +0000</updated>
                            <resolved>Mon, 27 Feb 2012 14:59:40 +0000</resolved>
                                                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="92795" author="milkie" created="Mon, 27 Feb 2012 14:59:40 +0000"  >&lt;p&gt;dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5100&quot; title=&quot;writelocktry in replMasterThread may make reads hang&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5100&quot;&gt;&lt;del&gt;SERVER-5100&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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                            <attachment id="14975" name="mongod.log.server-5028" size="1259781" author="dcrosta" created="Tue, 21 Feb 2012 21:01:25 +0000"/>
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