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    <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-475] IO Wait and CPU 100% utilization with no workload</title>
                <link>https://jira.mongodb.org/browse/SERVER-475</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongod is using 1 cpu core while doing absolutely nothing. There is nothing reading from , or writing to mongodb and yet 1 cpu core is at 100% (most of it is iowait)&lt;/p&gt;

&lt;p&gt;Fri Dec 11 10:11:07 connection accepted from 192.168.7.142:49806 #2&lt;br/&gt;
Fri Dec 11 10:11:07 end connection 192.168.7.142:49806&lt;br/&gt;
Fri Dec 11 10:12:07 connection accepted from 192.168.7.142:49811 #3&lt;br/&gt;
Fri Dec 11 10:12:07 end connection 192.168.7.142:49811&lt;br/&gt;
Fri Dec 11 10:13:08 connection accepted from 192.168.7.142:44181 #4&lt;br/&gt;
Fri Dec 11 10:13:08 end connection 192.168.7.142:44181&lt;br/&gt;
Fri Dec 11 10:14:07 connection accepted from 192.168.7.142:44183 #5&lt;br/&gt;
Fri Dec 11 10:14:08 end connection 192.168.7.142:44183&lt;br/&gt;
Fri Dec 11 10:15:07 connection accepted from 192.168.7.142:44185 #6&lt;br/&gt;
Fri Dec 11 10:15:08 end connection 192.168.7.142:44185&lt;br/&gt;
Fri Dec 11 10:16:08 connection accepted from 192.168.7.142:44187 #7&lt;br/&gt;
Fri Dec 11 10:16:08 end connection 192.168.7.142:44187&lt;/p&gt;

&lt;p&gt;stracing the process gives:&lt;/p&gt;

&lt;p&gt;rt_sigreturn(0x16)                      = -1 EINTR (Interrupted system call)&lt;br/&gt;
ioctl(6, SNDCTL_TMR_TIMEBASE or TCGETS, &lt;/p&gt;
{B38400 opost isig -icanon -echo ...}
&lt;p&gt;) = 0&lt;br/&gt;
ioctl(6, SNDCTL_TMR_CONTINUE or TCSETSF, &lt;/p&gt;
{B38400 opost isig icanon echo ...}
&lt;p&gt;) = ? ERESTARTSYS (To be restarted)&lt;br/&gt;
&amp;#8212; SIGTTOU (Stopped (tty output)) @ 0 (0) &amp;#8212;&lt;/p&gt;

&lt;p&gt;(the above output is constantly repeated)&lt;/p&gt;

&lt;p&gt;Killing the process and starting it again returned to normal idle usage&lt;/p&gt;</description>
                <environment>Ubuntu 9.10 64bit</environment>
        <key id="10985">SERVER-475</key>
            <summary>IO Wait and CPU 100% utilization with no workload</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="5">Cannot Reproduce</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="bandito">George Chatzigeorgiou</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Dec 2009 03:19:01 +0000</created>
                <updated>Fri, 26 Feb 2010 11:39:27 +0000</updated>
                            <resolved>Fri, 26 Feb 2010 11:39:27 +0000</resolved>
                                    <version>1.1.4</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="12590" author="eliot" created="Fri, 26 Feb 2010 11:39:27 +0000"  >&lt;p&gt;if this happens again - please comment and we can re-open&lt;/p&gt;</comment>
                            <comment id="11343" author="bandito" created="Fri, 11 Dec 2009 14:39:38 +0000"  >&lt;p&gt;Sorry, but I didn&apos;t. &lt;br/&gt;
I&apos;m trying to reproduce the problem so I can post the web console information.&lt;/p&gt;
</comment>
                            <comment id="11340" author="eliot" created="Fri, 11 Dec 2009 13:54:06 +0000"  >&lt;p&gt;did you happen to view the web console?  that&apos;s the most useful for debugging&lt;/p&gt;</comment>
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