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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-46667] Avoid invariant from invalid candidateIndex</title>
                <link>https://jira.mongodb.org/browse/SERVER-46667</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Original title and description: &quot;Audit config reference and comparison across config versions&quot;. In Safe Reconfig project, we allow data replication across config version and voting across config version. We need to audit config reference and member index comparison across config versions to avoid index comparison across config versions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1235096">SERVER-46667</key>
            <summary>Avoid invariant from invalid candidateIndex</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Mar 2020 23:56:19 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:10 +0000</updated>
                            <resolved>Wed, 25 Mar 2020 22:51:30 +0000</resolved>
                                                    <fixVersion>4.4.0-rc1</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3037507" author="jesse" created="Mon, 13 Apr 2020 19:03:41 +0000"  >&lt;p&gt;It&apos;s necessary - this audit produced one bugfix. I&apos;ll change the title.&lt;/p&gt;</comment>
                            <comment id="3037437" author="siyuan.zhou@10gen.com" created="Mon, 13 Apr 2020 18:37:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jesse&quot; class=&quot;user-hover&quot; rel=&quot;jesse&quot;&gt;jesse&lt;/a&gt;, this ticket is about a small fix to prevent an out-of-bound candidateIndex, so can we change the title? Since we only vote if the candidate is in the same config in all versions now, is it still necessary?&lt;/p&gt;</comment>
                            <comment id="3036794" author="jesse" created="Mon, 13 Apr 2020 14:40:43 +0000"  >&lt;p&gt;Requesting backport to 4.0 to preempt any BFs on the 4.0 branch.&lt;/p&gt;</comment>
                            <comment id="3034482" author="xgen-internal-githook" created="Fri, 10 Apr 2020 02:40:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;username&apos;: &apos;ajdavis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46667&quot; title=&quot;Avoid invariant from invalid candidateIndex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46667&quot;&gt;&lt;del&gt;SERVER-46667&lt;/del&gt;&lt;/a&gt; Avoid invariant from invalid candidateIndex&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 5adb80de95ab4f7784eb2905f82e4d8712578e3a)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/64c84a7c9d0d6035e9d8794371de33baa79ef020&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/64c84a7c9d0d6035e9d8794371de33baa79ef020&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2984377" author="xgen-internal-githook" created="Tue, 17 Mar 2020 23:10:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46667&quot; title=&quot;Avoid invariant from invalid candidateIndex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46667&quot;&gt;&lt;del&gt;SERVER-46667&lt;/del&gt;&lt;/a&gt; Avoid invariant from invalid candidateIndex&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5adb80de95ab4f7784eb2905f82e4d8712578e3a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5adb80de95ab4f7784eb2905f82e4d8712578e3a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2984361" author="jesse" created="Tue, 17 Mar 2020 23:02:19 +0000"  >&lt;p&gt;Next: unsafe use of primary member index in&#160;shouldChangeSyncSource().&lt;/p&gt;</comment>
                            <comment id="2969534" author="siyuan.zhou@10gen.com" created="Thu, 12 Mar 2020 00:34:43 +0000"  >&lt;p&gt;In election, the last vote records the candidate index given by the candidate, however, if the candidate has a different config, the index isn&apos;t meaningful anymore. We need to investigate either the inconsistency can lead to correctness issues.&lt;/p&gt;

&lt;p&gt;We could either reject the vote if the config version isn&apos;t the same, assuming config versions are unique. After a few heartbeats, they should be on the same config. This may cause liveness issues in the TLA+ spec, however if we assume heartbeats will run eventually, it seems fine to me. We can update the TLA+ spec to confirm the liveness. Alternatively, we may record the candidate&apos;s ID rather than index since we assume nodes never change their ID, but we need to update the vote request messages and the on-disk last vote. There might be upgrade/downgrade issues.&lt;/p&gt;</comment>
                    </comments>
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