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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-57126] Don&apos;t invariant that resharding machine completion promises are fulfilled on destruction</title>
                <link>https://jira.mongodb.org/browse/SERVER-57126</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h4&gt;&lt;a name=&quot;Background%3A&quot;&gt;&lt;/a&gt;Background:&lt;/h4&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;div class=&quot;panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;&quot;&gt;&lt;b&gt;Quote from Max Hirschhorn&#160;on Slack:&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot;&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I noticed while debugging a unit test failure for one of the resharding primary-only services that Instance::run() is scheduled as a task within the _scopedExecutor. This means it is possible for the following sequence to occur:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;getOrCreate() is called and caller now holds shared_ptr&amp;lt;Instance&amp;gt;&lt;/li&gt;
	&lt;li&gt;_insertNewInstance() schedules task to call Instance::run() but it doesn&apos;t run yet due to thread scheduling&lt;/li&gt;
	&lt;li&gt;stepdown occurs&lt;/li&gt;
	&lt;li&gt;_scopedExecutor is shut down and won&apos;t run any tasks&lt;/li&gt;
	&lt;li&gt;Instance::run() is never called&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&#160;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h4&gt;&lt;a name=&quot;Symptoms%3A&quot;&gt;&lt;/a&gt;Symptoms:&lt;/h4&gt;

&lt;p&gt;The completion promise is never fulfilled because Instance::run() is never called. This trips the invariant that the completion promise is fulfilled.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Solution%3A&quot;&gt;&lt;/a&gt;Solution:&lt;/h4&gt;

&lt;p&gt;Remove the invariant. It&apos;s okay for the completion promise to not be fulfilled if the _scopedExecutor has not called Instance::run().&lt;/p&gt;</description>
                <environment></environment>
        <key id="1743580">SERVER-57126</key>
            <summary>Don&apos;t invariant that resharding machine completion promises are fulfilled on destruction</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-autocommits</label>
                            <label>post-rc0</label>
                    </labels>
                <created>Fri, 21 May 2021 14:34:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:13 +0000</updated>
                            <resolved>Tue, 25 May 2021 17:04:24 +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="4108188" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:59:34 +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="3838407" author="xgen-internal-githook" created="Tue, 25 May 2021 16:34:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57126&quot; title=&quot;Don&amp;#39;t invariant that resharding machine completion promises are fulfilled on destruction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57126&quot;&gt;&lt;del&gt;SERVER-57126&lt;/del&gt;&lt;/a&gt; Don&apos;t invariant that resharding machine completion promises are fulfilled on destruction&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 559c162eb6e0fe63d556bf146b5f7898bede9c9d)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b5b8f334eb6dee426636c74e3cb9a90edb152078&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b5b8f334eb6dee426636c74e3cb9a90edb152078&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3837789" author="xgen-internal-githook" created="Tue, 25 May 2021 15:05:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57126&quot; title=&quot;Don&amp;#39;t invariant that resharding machine completion promises are fulfilled on destruction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57126&quot;&gt;&lt;del&gt;SERVER-57126&lt;/del&gt;&lt;/a&gt; Don&apos;t invariant that resharding machine completion promises are fulfilled on destruction&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/559c162eb6e0fe63d556bf146b5f7898bede9c9d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/559c162eb6e0fe63d556bf146b5f7898bede9c9d&lt;/a&gt;&lt;/p&gt;</comment>
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