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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-37162] Bad host string given to rs.add() on Replicated Config servers may take down entire cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-37162</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have a sharded development cluster running 3.2.18 that we are moving from SCCC to Replicated config servers.&lt;/p&gt;

&lt;p&gt;The cluster consists of 3 config servers, 18 MongoD shards, and 5 MongoS&apos;s.&lt;/p&gt;

&lt;p&gt;At one point in the migration process, where we were now using a replicated config server configuration, we accidentally issued a bad rs.add() command from the mongo shell against the Primary Config Server:&lt;/p&gt;

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

&lt;p&gt;&amp;gt; rs.add(&quot;csReplSet/dev-config-2.domain.com:27019&quot;)&lt;/p&gt;

&lt;p&gt;We should not have included the initial &quot;csReplSet/&quot; within the string (human error).&lt;/p&gt;

&lt;p&gt;However, what happened next was concerning.&lt;/p&gt;

&lt;p&gt;While the config servers were fine (rs.status showed it couldn&apos;t reach the new host), every MongoS and MongoD host issued a backtrace / core dump and terminated.&lt;/p&gt;

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

&lt;p&gt;Here is what the Config server rs.status reported for the added host:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Here&apos;s the log output from a MongoD (shard) just before the backtrace.&lt;/p&gt;
&lt;p/&gt;
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&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;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;2018-09-14T15:38:55.179+0000 I NETWORK  [ReplicaSetMonitorWatcher] changing hosts to csReplSet/dev-config-0.domain.com:27019,dev-config-4.domain.com:27019,csReplSet/dev-config-3.domain.com:27019 from csReplSet/dev-config-0.domain.com:27019,dev-config-4.domain.com:27019&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;   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;2018-09-14T15:38:55.179+0000 I -        [ReplicaSetMonitorWatcher]&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;It looks like the MongoS and MongoD hosts tried to adjust their config server list to add the new host, but did not validate the hostname before trying to use it?&#160;&lt;/p&gt;

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

&lt;p&gt;We recovered our development environment from backup, and are going to be testing our process again. While I don&apos;t have the full list of log files to provide here, we could try this again if you need more details.&lt;/p&gt;

&lt;p&gt;Reproducing it shouldn&apos;t be hard though, just add a bad host to the config server replicaset!&lt;/p&gt;</description>
                <environment></environment>
        <key id="605873">SERVER-37162</key>
            <summary>Bad host string given to rs.add() on Replicated Config servers may take down entire cluster</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="nick.brewer">Nick Brewer</assignee>
                                    <reporter username="dave.muysson@360pi.com">Dave Muysson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Sep 2018 13:47:22 +0000</created>
                <updated>Wed, 19 Sep 2018 12:54:04 +0000</updated>
                            <resolved>Tue, 18 Sep 2018 18:06:57 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2006899" author="nick.brewer" created="Tue, 18 Sep 2018 18:06:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dave.muysson%40360pi.com&quot; class=&quot;user-hover&quot; rel=&quot;dave.muysson@360pi.com&quot;&gt;dave.muysson@360pi.com&lt;/a&gt; We&apos;ve determined that the best way to prevent this is to strictly disallow including connection strings in a replica set config. We&apos;ve opened a separate ticket to track this work, which you can follow here: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37190&quot; title=&quot;Don&amp;#39;t allow adding replica set connection strings for a member in a replica set config&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37190&quot;&gt;&lt;del&gt;SERVER-37190&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Since we&apos;re now tracking this elsewhere, I&apos;m going to go ahead and close this ticket.  Thanks again for your detailed report, and please let us know if you have any questions.&lt;/p&gt;

&lt;p&gt;-Nick&lt;/p&gt;
</comment>
                            <comment id="2006878" author="spencer" created="Tue, 18 Sep 2018 17:56:45 +0000"  >&lt;p&gt;This does seem like a real bug.  I think the proper fix is that we shouldn&apos;t allow a replica set connection string for a &apos;host&apos; field in a replica set config.  I filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37190&quot; title=&quot;Don&amp;#39;t allow adding replica set connection strings for a member in a replica set config&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37190&quot;&gt;&lt;del&gt;SERVER-37190&lt;/del&gt;&lt;/a&gt; for that change.&lt;/p&gt;</comment>
                            <comment id="2006294" author="dave.muysson@360pi.com" created="Tue, 18 Sep 2018 12:42:38 +0000"  >&lt;p&gt;Thanks Nick - Very happy to hear you were able to reproduce it locally!&lt;/p&gt;

&lt;p&gt;If there&apos;s anything we can do to help out on our end, just let us know.&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Dave&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="2005876" author="nick.brewer" created="Mon, 17 Sep 2018 22:56:37 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dave.muysson%40360pi.com&quot; class=&quot;user-hover&quot; rel=&quot;dave.muysson@360pi.com&quot;&gt;dave.muysson@360pi.com&lt;/a&gt; Thanks for your report. I&apos;ve managed to reproduce this, and we&apos;re currently investigating. &lt;/p&gt;

&lt;p&gt;-Nick&lt;/p&gt;</comment>
                    </comments>
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                            <customfieldvalue>&lt;p&gt;In a sharded environment running with a replicated config server, perform an rs.add() that includes the replicaset name in front of the host dns name and port.&lt;/p&gt;

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

&lt;p&gt;i.e. rs.add(&quot;replsetname/host:port&quot;) instead of rs.add(&quot;host:port&quot;)&lt;/p&gt;</customfieldvalue>

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