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    <title>MongoDB Jira</title>
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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-3477] Signal 11 crash</title>
                <link>https://jira.mongodb.org/browse/SERVER-3477</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The mongos crashed with a signal 11 after a lot of &quot;killing old cursor&quot;.&lt;/p&gt;

&lt;p&gt;I can see a &lt;br/&gt;
MessagingPort say send() errno:104 Connection reset by peer CLIENT:52821&lt;br/&gt;
Tue Jul 26 10:51:10 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn177&amp;#93;&lt;/span&gt; DBException in process: socket exception&lt;br/&gt;
Tue Jul 26 10:51:10 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn177&amp;#93;&lt;/span&gt; MessagingPort say send() errno:32 Broken pipe CLIENT:52821&lt;br/&gt;
Tue Jul 26 10:51:10 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn177&amp;#93;&lt;/span&gt; unclean socket shutdown from: CLIENT:52821&lt;/p&gt;

&lt;p&gt;just before the crash (see attachment)&lt;/p&gt;</description>
                <environment>Linux 2.6.18-238.19.1.el5 #1 SMP Fri Jul 15 07:31:24 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux&lt;br/&gt;
CentOS 5</environment>
        <key id="20140">SERVER-3477</key>
            <summary>Signal 11 crash</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="kamaradclimber">Gr&#233;goire Seux</reporter>
                        <labels>
                            <label>mongos</label>
                    </labels>
                <created>Tue, 26 Jul 2011 13:13:42 +0000</created>
                <updated>Tue, 30 Aug 2011 03:05:47 +0000</updated>
                            <resolved>Tue, 30 Aug 2011 03:05:47 +0000</resolved>
                                    <version>1.8.2</version>
                                                    <component>Sharding</component>
                    <component>Stability</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="51383" author="eliot" created="Tue, 30 Aug 2011 03:05:47 +0000"  >&lt;p&gt;see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3002&quot; title=&quot;mongos memory error CursorCache iterator error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3002&quot;&gt;&lt;del&gt;SERVER-3002&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="46049" author="kamaradclimber" created="Wed, 3 Aug 2011 08:15:04 +0000"  >&lt;p&gt;Ok now I know what may be responsible for this bug : background index building.&lt;/p&gt;

&lt;p&gt;My use case is the following :&lt;br/&gt;
in the beginning of the operation I create an index using the background option (the collection is empty or so)&lt;br/&gt;
for each batch of operation I ensure this index exists&lt;br/&gt;
the mongos (why ?) crashes while being under pressure (basically when I modify the field indexed by the background index a lot )&lt;/p&gt;


&lt;p&gt;The crash didn&apos;t occur before I have discovered the background indexing, and now that I don&quot;t use it anymore, it has not happened again.&lt;/p&gt;</comment>
                            <comment id="45569" author="kamaradclimber" created="Mon, 1 Aug 2011 14:01:53 +0000"  >&lt;p&gt;the last 10 minutes of mongos with -vvv option are in attachment&lt;/p&gt;

&lt;p&gt;full log is too heavy for being uploaded on jira, here it is : &lt;a href=&quot;http://fichiers.ecp.fr/get?k=2ikD4ciTLPPJJGuVMEs&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://fichiers.ecp.fr/get?k=2ikD4ciTLPPJJGuVMEs&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="45559" author="scotthernandez" created="Mon, 1 Aug 2011 13:10:19 +0000"  >&lt;p&gt;It would be good to get more verbose logs (run with --vvvvv) and more than 10 minutes of logs from before the incident.&lt;/p&gt;

&lt;p&gt;Are you able to reproduce this error?&lt;/p&gt;</comment>
                            <comment id="44491" author="kamaradclimber" created="Tue, 26 Jul 2011 13:14:32 +0000"  >&lt;p&gt;this bug report follows the thread &lt;a href=&quot;https://groups.google.com/forum/?hl=fr#!topic/mongodb-user/Ba-23yny9xY&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?hl=fr#!topic/mongodb-user/Ba-23yny9xY&lt;/a&gt;&lt;/p&gt;
</comment>
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                            <attachment id="12418" name="issue.log" size="64112" author="kamaradclimber" created="Tue, 26 Jul 2011 13:13:43 +0000"/>
                            <attachment id="12454" name="mongos_crash_last10min.log.gz" size="28900094" author="kamaradclimber" created="Mon, 1 Aug 2011 14:01:53 +0000"/>
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