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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-52655] Mongo thread hangs intermittently.</title>
                <link>https://jira.mongodb.org/browse/SERVER-52655</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello,&lt;/p&gt;

&lt;p&gt;&#160; Mongod thread hangs on &quot;recvmsg&quot; system call because of this seeing very high load on replica set. I don&apos;t see any COLLSCAN in logs. When thread hangs read and write queue increases which is obvious. Not sure what is happening with this replicaset.&lt;/p&gt;

&lt;p&gt;Currently running 3.6.16 mongod on aws i3.16xlarge instance type. PRIMARY is failing over all the time whenever all the threads hangs.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1535429">SERVER-52655</key>
            <summary>Mongo thread hangs intermittently.</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="9">Done</resolution>
                                        <assignee username="edwin.zhou@mongodb.com">Edwin Zhou</assignee>
                                    <reporter username="nvaidyanath@paloaltonetworks.com">Nitesh Vaidyanath</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Nov 2020 03:59:45 +0000</created>
                <updated>Wed, 2 Dec 2020 15:37:08 +0000</updated>
                            <resolved>Wed, 2 Dec 2020 15:37:08 +0000</resolved>
                                    <version>3.6.16</version>
                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3512493" author="JIRAUSER1257066" created="Wed, 2 Dec 2020 15:36:36 +0000"  >&lt;p&gt;Hi Nitesh,&lt;/p&gt;

&lt;p&gt;Glad to hear it&apos;s been resolved. I&apos;ll close this ticket now as requested.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Best,&lt;/p&gt;

&lt;p&gt;Edwin&lt;/p&gt;</comment>
                            <comment id="3506725" author="JIRAUSER1257522" created="Thu, 26 Nov 2020 16:34:23 +0000"  >&lt;p&gt;Hi Edwin, feel free to close the Jira case. Issue was with one of our clients, after restarting client service issue got resolved. Thanks for your help and quick response.&#160;&lt;/p&gt;</comment>
                            <comment id="3504353" author="JIRAUSER1257066" created="Tue, 24 Nov 2020 21:10:28 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nvaidyanath%40paloaltonetworks.com&quot; class=&quot;user-hover&quot; rel=&quot;nvaidyanath@paloaltonetworks.com&quot;&gt;nvaidyanath@paloaltonetworks.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We still need additional information to diagnose the problem. If this is still an issue for you, would you please collect perf, logs, and diagnostic.data with the timestamps and attach it to this ticket?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="3484187" author="JIRAUSER1257066" created="Tue, 10 Nov 2020 20:05:49 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nvaidyanath%40paloaltonetworks.com&quot; class=&quot;user-hover&quot; rel=&quot;nvaidyanath@paloaltonetworks.com&quot;&gt;nvaidyanath@paloaltonetworks.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for your report and for providing the gdb, ftdc and screenshots detailing the events. After some investigation, we were unable to pinpoint an exact reason why you&apos;re witnessing performance issues. We were unable to make any concrete correlations as the screenshots provided are missing a timezone.&lt;/p&gt;

&lt;p&gt;Could you provide a detailed timeline of events when the queuing occurs, when the hanging occurs, when the node fails over, and when the stack traces were collected?&lt;/p&gt;

&lt;p&gt;While the mongod is running and your issues are occurring, would you be able to collect perf during the incidents you described? Please make sure an exact timestamp is included. If it&apos;s not, you can run perf with the &lt;tt&gt;--start&lt;/tt&gt; option.&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;
		&lt;tbody &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;  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;# record call stack samples and generate text output on test node&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;# note the exact time at which the recording was done in order&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;# to allow correlation with other events&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;perf record  -a -g -F 99 sleep 60&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;   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;perf script &amp;gt;perf.txt&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;We will also want the diagnostic.data, logs, and the perf.txt&#160;&lt;/p&gt;

&lt;p&gt;Best,&lt;/p&gt;

&lt;p&gt;Edwin&lt;/p&gt;</comment>
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