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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-57228] Config Server crashes when updating FCV using an inconsistent FCV document</title>
                <link>https://jira.mongodb.org/browse/SERVER-57228</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When receiving an FCV update request, the Config Server relies on the current document &lt;tt&gt;admin.system.version {&quot;_id&quot;: &quot;featureCompatibilityVersion&quot;&lt;/tt&gt;} to determine whether to recover from a previous interrupted run.&lt;/p&gt;

&lt;p&gt;The Config Server could crash during a FCV upgrade and after an explicit (and illegal) amend of such document. The invalid persisted information leads the Config Server to execute a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f38801670ddc271424511a366ea62e099ece6967/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L405&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wrong logic&lt;/a&gt; that requires the availability of missing information in that document (that is changeTimestamp), and then hit and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f38801670ddc271424511a366ea62e099ece6967/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L414&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In this scenario, the FCV document is syntactically but not semantically correct.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1758338">SERVER-57228</key>
            <summary>Config Server crashes when updating FCV using an inconsistent FCV document</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="13201">Fixed</resolution>
                                        <assignee username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</assignee>
                                    <reporter username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 May 2021 20:33:45 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:02 +0000</updated>
                            <resolved>Fri, 28 May 2021 06:59:48 +0000</resolved>
                                                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4106894" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:11:54 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3848478" author="xgen-internal-githook" created="Fri, 28 May 2021 20:19:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57228&quot; title=&quot;Config Server crashes when updating FCV using an inconsistent FCV document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57228&quot;&gt;&lt;del&gt;SERVER-57228&lt;/del&gt;&lt;/a&gt; Config Server crashes when updating FCV using an inconsistent FCV document&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ea20db1c220fb11f74a1ee2f460b07a2820b1e9c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ea20db1c220fb11f74a1ee2f460b07a2820b1e9c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3845996" author="xgen-internal-githook" created="Thu, 27 May 2021 20:30:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57228&quot; title=&quot;Config Server crashes when updating FCV using an inconsistent FCV document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57228&quot;&gt;&lt;del&gt;SERVER-57228&lt;/del&gt;&lt;/a&gt; Config Server crashes when updating FCV using an inconsistent FCV document&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/82369a1da427f67113324ae98f9413669173fdb1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/82369a1da427f67113324ae98f9413669173fdb1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3844368" author="JIRAUSER1259062" created="Thu, 27 May 2021 12:37:08 +0000"  >&lt;p&gt;We had a good range of solutions to the problem, such as the possibility of implementing a consistency check at the time of insertion or modification of the FCV document (there is, the &lt;tt&gt;changeTimestamp&lt;/tt&gt; field must be there during the upgrade/downgrade operation). Nevertheless, considering the various use cases with the consequent possibility of not triggering these checks, I decided to simply resolve the risk of crash replacing the invariant with a user assertion (&lt;tt&gt;uassert&lt;/tt&gt;). See below the new user experience:&lt;/p&gt;
&lt;p/&gt;
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					&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;mongos&amp;gt; db.adminCommand({&quot;setFeatureCompatibilityVersion&quot; : &quot;5.0&quot;})&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
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                            <customfieldvalue>1|hzhyd3:</customfieldvalue>

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                                <customfieldvalue id="4840">Sharding EMEA 2021-05-31</customfieldvalue>

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                        <customfieldname>Steps To Reproduce</customfieldname>
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                            <customfieldvalue>&lt;p&gt;The steps to reproduce the problem with a sharded cluster from a Mongo Shell connected to the Mongo Router are:&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;// This is an environment using FCV 5.0&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;mongos&amp;gt; db.system.version.find()&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;{ &quot;_id&quot; : &quot;featureCompatibilityVersion&quot;, &quot;version&quot; : &quot;5.0&quot; }&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;&amp;nbsp;&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;// Explicitly change the persisted document required by the FCV logic providing inconsistent information&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;mongos&amp;gt; db.system.version.update({&quot;_id&quot; : &quot;featureCompatibilityVersion&quot;}, {$set: {&quot;version&quot; : &quot;4.4&quot;, &quot;targetVersion&quot; : &quot;5.0&quot;}})&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;WriteResult({ &quot;nMatched&quot; : 1, &quot;nUpserted&quot; : 0, &quot;nModified&quot; : 1 })&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;&amp;nbsp;&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;// This causes the Config Server&apos;s crash&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;mongos&amp;gt; db.adminCommand({&quot;setFeatureCompatibilityVersion&quot; : &quot;5.0&quot;})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</customfieldvalue>

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