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    <title>MongoDB Jira</title>
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    <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-46466] Race with findAndModify retryable write and session migration</title>
                <link>https://jira.mongodb.org/browse/SERVER-46466</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Race:&lt;/p&gt;

&lt;p&gt;1. FindAndModify write with txnNumber 10 is executed in shardA&lt;br/&gt;
2. Migration of chunk from shardA to shardB starts.&lt;br/&gt;
3. Session migration thread pulled oplog for write in step#1 and passed all the checks and about to write oplog &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.13/src/mongo/db/s/session_catalog_migration_destination.cpp#L260&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&lt;br/&gt;
4. A new retryable write with txnNumber 11 starts and successfully writes to oplog.&lt;br/&gt;
5. Session migration thread writes oplog for txnNumber 10. Primary successfully wrote an oplog with higher optime but lower txnNumber.&lt;/p&gt;

&lt;p&gt;Consequence:&lt;/p&gt;

&lt;p&gt;Secondaries can potentially hit this fassert:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.15/src/mongo/db/repl/session_update_tracker.cpp#L98&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r4.0.15/src/mongo/db/repl/session_update_tracker.cpp#L98&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Note: this race is no longer possible in v4.2 because we checkout the session when session migration thread tries to process the oplog entries, so the interleaving is no longer possible.&lt;/p&gt;

&lt;p&gt;Here are the conditions to hit to this race:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;running older than v4.2&lt;/li&gt;
	&lt;li&gt;using retryable writes with findAndModify&lt;/li&gt;
	&lt;li&gt;migrations happening while using retryable write&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1198098">SERVER-46466</key>
            <summary>Race with findAndModify retryable write and session migration</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 27 Feb 2020 21:23:25 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:35 +0000</updated>
                            <resolved>Wed, 4 Mar 2020 19:25:42 +0000</resolved>
                                    <version>3.6.0</version>
                    <version>4.0.0</version>
                                    <fixVersion>3.6.18</fixVersion>
                    <fixVersion>4.0.17</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="3896427" author="renctan" created="Thu, 24 Jun 2021 13:43:54 +0000"  >&lt;p&gt;Yes, this is a script used to demonstrate the race. However, as noted in the comment inside the script, you will need a custom mongod build with sleep inserted in a certain location to make the race more likely to occur.&lt;/p&gt;</comment>
                            <comment id="3896144" author="JIRAUSER1260761" created="Thu, 24 Jun 2021 11:12:30 +0000"  >&lt;p&gt;what&apos;s this test.js used for ?&#160; is it for trigger this bug for test ?&#160; i too have encountered this bug , and i want to know how to trigger this bug manually and then update to a fix version to see if this fixed version work or not ?&#160;&lt;/p&gt;</comment>
                            <comment id="2945962" author="xgen-internal-githook" created="Thu, 5 Mar 2020 17:04:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;username&apos;: &apos;renctan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46466&quot; title=&quot;Race with findAndModify retryable write and session migration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46466&quot;&gt;&lt;del&gt;SERVER-46466&lt;/del&gt;&lt;/a&gt; Make session migration destination check out session&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6931d7b2d6b5f6864a3995554f9af9e30fe859e9)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b3e25a1f353cdd7e47e3efe0119ef3a0770c093e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b3e25a1f353cdd7e47e3efe0119ef3a0770c093e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2934949" author="xgen-internal-githook" created="Wed, 4 Mar 2020 19:07:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;renctan&apos;, &apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46466&quot; title=&quot;Race with findAndModify retryable write and session migration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46466&quot;&gt;&lt;del&gt;SERVER-46466&lt;/del&gt;&lt;/a&gt; Make session migration destination check out session&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6931d7b2d6b5f6864a3995554f9af9e30fe859e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6931d7b2d6b5f6864a3995554f9af9e30fe859e9&lt;/a&gt;&lt;/p&gt;</comment>
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