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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-80328] Fix race condition in cancel_coordinate_txn_commit_with_tickets_exhausted.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-80328</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Test cancel_coordinate_txn_commit_with_tickets_exhausted.js checks that transaction coordinator will correctly timeout and abort transaction even if all write tickets from WiredTiger are exhausted.&lt;/p&gt;

&lt;p&gt;It uses hangWithLockDuringBatchRemove to create threads that exhaust write tickets and transaction coordinator server status to determine when transaction is past certain point: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a4f458fe4d7a44eba056f5c150753e73067c8e4d/jstests/sharding/cancel_coordinate_txn_commit_with_tickets_exhausted.js#L135&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/a4f458fe4d7a44eba056f5c150753e73067c8e4d/jstests/sharding/cancel_coordinate_txn_commit_with_tickets_exhausted.js#L135&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;After the transaction is past kWaitingForVotes, it disabled the fail points.&lt;/p&gt;

&lt;p&gt;It used to work, because we used to do everything inside transaction coordinator synchronously, but as a side effect of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79091&quot; title=&quot;Write endOfTransaction oplog entry to transaction coordinator shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79091&quot;&gt;&lt;del&gt;SERVER-79091&lt;/del&gt;&lt;/a&gt; we know delete coordinator doc asynchronously and the test run one transaction before starting the test to initialize transaction_coordinator system:&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a4f458fe4d7a44eba056f5c150753e73067c8e4d/jstests/sharding/cancel_coordinate_txn_commit_with_tickets_exhausted.js#L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/a4f458fe4d7a44eba056f5c150753e73067c8e4d/jstests/sharding/cancel_coordinate_txn_commit_with_tickets_exhausted.js#L86&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;In rare cases it is possible that the check (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a4f458fe4d7a44eba056f5c150753e73067c8e4d/jstests/sharding/cancel_coordinate_txn_commit_with_tickets_exhausted.js#L135&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;line 135&lt;/a&gt;) that supposed to check our main transaction (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a4f458fe4d7a44eba056f5c150753e73067c8e4d/jstests/sharding/cancel_coordinate_txn_commit_with_tickets_exhausted.js#L99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;line 99&lt;/a&gt;) will be satisfied by prior transaction (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a4f458fe4d7a44eba056f5c150753e73067c8e4d/jstests/sharding/cancel_coordinate_txn_commit_with_tickets_exhausted.js#L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;line 86&lt;/a&gt;) and fail point will disabled before we are able to satisfy check on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a4f458fe4d7a44eba056f5c150753e73067c8e4d/jstests/sharding/cancel_coordinate_txn_commit_with_tickets_exhausted.js#L106&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;line 106&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2424152">SERVER-80328</key>
            <summary>Fix race condition in cancel_coordinate_txn_commit_with_tickets_exhausted.js</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Aug 2023 10:14:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:13 +0000</updated>
                            <resolved>Thu, 24 Aug 2023 10:04:52 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5655670" author="xgen-internal-githook" created="Thu, 24 Aug 2023 10:03:54 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80328&quot; title=&quot;Fix race condition in cancel_coordinate_txn_commit_with_tickets_exhausted.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80328&quot;&gt;&lt;del&gt;SERVER-80328&lt;/del&gt;&lt;/a&gt; Fix race condition in cancel_coordinate_txn_commit_with_tickets_exhausted.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c0c78d35b945397d6fdc789d291fccf83cba08a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c0c78d35b945397d6fdc789d291fccf83cba08a4&lt;/a&gt;&lt;/p&gt;</comment>
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