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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-45912] rollback_fuzzer_unclean_shutdowns can fail after restarting a node during rollback</title>
                <link>https://jira.mongodb.org/browse/SERVER-45912</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The following race can occasionally occur:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;rollback_fuzzer_unclean_shutdowns starts a 3-node set&lt;/li&gt;
	&lt;li&gt;it causes Node 1 to enter rollback&lt;/li&gt;
	&lt;li&gt;Node 1 increments its Rollback ID&lt;/li&gt;
	&lt;li&gt;the test restarts Node 1 before it can truncate its oplog&lt;/li&gt;
	&lt;li&gt;Node 1 restarts, it&apos;s still on the wrong branch of history, so it enters rollback again&lt;/li&gt;
	&lt;li&gt;Node 1 increments its RBID again&lt;/li&gt;
	&lt;li&gt;In rollback_test.js, transitionToSteadyStateOperations asserts Node 1&apos;s RBID is exactly the test&apos;s previous known RBID + 1, but fails because it was incremented twice&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The same issue affects code in rollback_test_deluxe, although I don&apos;t think that copy of the bug can be triggered in fuzz testing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1124683">SERVER-45912</key>
            <summary>rollback_fuzzer_unclean_shutdowns can fail after restarting a node during rollback</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="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Jan 2020 18:52:28 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:40 +0000</updated>
                            <resolved>Fri, 14 Feb 2020 14:00:42 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2877820" author="xgen-internal-githook" created="Fri, 14 Feb 2020 00:31:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;vessy-mongodb&apos;, &apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45912&quot; title=&quot;rollback_fuzzer_unclean_shutdowns can fail after restarting a node during rollback&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45912&quot;&gt;&lt;del&gt;SERVER-45912&lt;/del&gt;&lt;/a&gt; Fix typo in rollback_test.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/149aae77fd00cbb0d5760881e76eae631e1f0e11&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/149aae77fd00cbb0d5760881e76eae631e1f0e11&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2877508" author="xgen-internal-githook" created="Thu, 13 Feb 2020 20:42:53 +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-45912&quot; title=&quot;rollback_fuzzer_unclean_shutdowns can fail after restarting a node during rollback&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45912&quot;&gt;&lt;del&gt;SERVER-45912&lt;/del&gt;&lt;/a&gt; Handle shutdown during rollback in fuzz tests&lt;/p&gt;

&lt;p&gt;In rollback_fuzzer_unclean_shutdowns we can restart a node while it&apos;s in&lt;br/&gt;
ROLLBACK, after it has incremented its Rollback ID but before it has truncated&lt;br/&gt;
its oplog. In that case it will restart, pass through states SECONDARY and&lt;br/&gt;
ROLLBACK, and increment its Rollback ID again after restarting. Update&lt;br/&gt;
rollback_test.js to handle cases where the node enters and exits ROLLBACK and&lt;br/&gt;
increments its RBID several times.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9aa9fa4a2844f0fe7890e01d621960a0c64607f6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9aa9fa4a2844f0fe7890e01d621960a0c64607f6&lt;/a&gt;&lt;/p&gt;</comment>
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