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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-69861] Uninterruptible lock guard in election causes FCBIS to hang</title>
                <link>https://jira.mongodb.org/browse/SERVER-69861</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to avoid interrupting ourselves due to our own stepdown, we use uninterruptible locks when writing lastVote in an election.  Unfortunately if we&apos;ve taken the global lock in X mode for FCBIS storage change, this leads to a deadlock &amp;#8211; we&apos;re trying to acquire a write lock on an uninterruptible opCtx while also attempting to kill the opCtx so we can change storage and release the lock.&lt;/p&gt;

&lt;p&gt;The quick fix might be to not acquire the uninterruptible lock guard during STARTUP2, but we should definitely add a test for this; since initial sync nodes are usually non-voting we don&apos;t have coverage for an election during it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2142471">SERVER-69861</key>
            <summary>Uninterruptible lock guard in election causes FCBIS to hang</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="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Sep 2022 15:38:55 +0000</created>
                <updated>Sun, 29 Oct 2023 21:33:00 +0000</updated>
                            <resolved>Tue, 4 Oct 2022 20:49:26 +0000</resolved>
                                                    <fixVersion>6.0.3</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4936764" author="xgen-internal-githook" created="Fri, 28 Oct 2022 19:13:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69861&quot; title=&quot;Uninterruptible lock guard in election causes FCBIS to hang&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69861&quot;&gt;&lt;del&gt;SERVER-69861&lt;/del&gt;&lt;/a&gt; Uninterruptible lock guard in election causes FCBIS to hang&lt;br/&gt;
             Support for reading last vote in data_replicator_external_state&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 810d5c1f2b0f8d3767df55812c3324d6171aa107)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6c1b9191fd8fc814aae17b0c99785983c190f5bf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6c1b9191fd8fc814aae17b0c99785983c190f5bf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4936763" author="xgen-internal-githook" created="Fri, 28 Oct 2022 19:13:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69861&quot; title=&quot;Uninterruptible lock guard in election causes FCBIS to hang&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69861&quot;&gt;&lt;del&gt;SERVER-69861&lt;/del&gt;&lt;/a&gt; Uninterruptible lock guard in election causes FCBIS to hang&lt;/p&gt;

&lt;p&gt;             Avoid an unusual scenario where if an node were being resynced (not added initially)&lt;br/&gt;
             with FCBIS, and an election occurred along with a particular sequence of network&lt;br/&gt;
             splits, and the node was restarted directly after FCBIS completed, the node could&lt;br/&gt;
             vote twice for different canddiates in the same term.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b12d8de0d90fbec0fc180dfa88ec4f77a586f0a4)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/4b242224845c6bc89c47adead1f7784051e80762&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/4b242224845c6bc89c47adead1f7784051e80762&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4876917" author="xgen-internal-githook" created="Tue, 4 Oct 2022 15:49:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69861&quot; title=&quot;Uninterruptible lock guard in election causes FCBIS to hang&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69861&quot;&gt;&lt;del&gt;SERVER-69861&lt;/del&gt;&lt;/a&gt; Uninterruptible lock guard in election causes FCBIS to hang&lt;br/&gt;
             Support for reading last vote in data_replicator_external_state&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/810d5c1f2b0f8d3767df55812c3324d6171aa107&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/810d5c1f2b0f8d3767df55812c3324d6171aa107&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4876916" author="xgen-internal-githook" created="Tue, 4 Oct 2022 15:49:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69861&quot; title=&quot;Uninterruptible lock guard in election causes FCBIS to hang&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69861&quot;&gt;&lt;del&gt;SERVER-69861&lt;/del&gt;&lt;/a&gt; Uninterruptible lock guard in election causes FCBIS to hang&lt;/p&gt;

&lt;p&gt;             Avoid an unusual scenario where if an node were being resynced (not added initially)&lt;br/&gt;
             with FCBIS, and an election occurred along with a particular sequence of network&lt;br/&gt;
             splits, and the node was restarted directly after FCBIS completed, the node could&lt;br/&gt;
             vote twice for different canddiates in the same term.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/b12d8de0d90fbec0fc180dfa88ec4f77a586f0a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/b12d8de0d90fbec0fc180dfa88ec4f77a586f0a4&lt;/a&gt;&lt;/p&gt;</comment>
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