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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-40297] AsyncWorkScheduler&apos;s join method does not guarantee that all scheduled future chains have ran</title>
                <link>https://jira.mongodb.org/browse/SERVER-40297</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The TransactionCoordinator&apos;s destructor relies on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/181d9dab794d1c2bf41e88e68b63fa5d208468ce/src/mongo/db/s/transaction_coordinator.cpp#L100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;joining&lt;/a&gt; the AsyncWorkScheduler in order to ensure that there are no more threads, which could be accessing it. However, the AsyncWorkScheduler unregisters the subordinate &lt;a href=&quot;https://github.com/mongodb/mongo/blob/181d9dab794d1c2bf41e88e68b63fa5d208468ce/src/mongo/db/s/transaction_coordinator_futures_util.h#L110&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;tasks&apos;&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/181d9dab794d1c2bf41e88e68b63fa5d208468ce/src/mongo/db/s/transaction_coordinator_futures_util.cpp#L153&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;network responses&apos;&lt;/a&gt; handles before the full chain has finished executing, which causes a race condition where the destructor of TransactionCoordinator can finish running while the future chains are still running. This results in an access violation crash.&lt;/p&gt;</description>
                <environment></environment>
        <key id="721217">SERVER-40297</key>
            <summary>AsyncWorkScheduler&apos;s join method does not guarantee that all scheduled future chains have ran</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Mar 2019 17:49:29 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:42 +0000</updated>
                            <resolved>Wed, 3 Apr 2019 20:50:32 +0000</resolved>
                                    <version>4.1.9</version>
                                    <fixVersion>4.1.10</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2201198" author="xgen-internal-githook" created="Wed, 3 Apr 2019 20:48:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;username&apos;: &apos;kaloianm&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40297&quot; title=&quot;AsyncWorkScheduler&amp;#39;s join method does not guarantee that all scheduled future chains have ran&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40297&quot;&gt;&lt;del&gt;SERVER-40297&lt;/del&gt;&lt;/a&gt; Make the TransactionCoordinator entirely futures-based&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7575dac4abe7d5c6164b54487a81771cd3aad644&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7575dac4abe7d5c6164b54487a81771cd3aad644&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2197443" author="xgen-internal-githook" created="Mon, 1 Apr 2019 11:27:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40297&quot; title=&quot;AsyncWorkScheduler&amp;#39;s join method does not guarantee that all scheduled future chains have ran&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40297&quot;&gt;&lt;del&gt;SERVER-40297&lt;/del&gt;&lt;/a&gt; Make all TransactionCoordinatorDriver methods free functions&lt;/p&gt;

&lt;p&gt;The TransactionCoordinatorDriver is not really a &quot;driver&quot;, but just a&lt;br/&gt;
set of functions to perform asynchronous work. There isn&apos;t any state to&lt;br/&gt;
keep, so there is no need for them to be in a class.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/907e4760487e081db031232d1f8326c0f8bdef68&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/907e4760487e081db031232d1f8326c0f8bdef68&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2197442" author="xgen-internal-githook" created="Mon, 1 Apr 2019 11:27:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40297&quot; title=&quot;AsyncWorkScheduler&amp;#39;s join method does not guarantee that all scheduled future chains have ran&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40297&quot;&gt;&lt;del&gt;SERVER-40297&lt;/del&gt;&lt;/a&gt; Move the TransactionCoordinator data structures to a separate file&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9dd07662bbe80415d90131fca2be6312166d6f39&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9dd07662bbe80415d90131fca2be6312166d6f39&lt;/a&gt;&lt;/p&gt;</comment>
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