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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-45752] opCtx interruption during migration critical section commit triggers fassert in FCV 4.2</title>
                <link>https://jira.mongodb.org/browse/SERVER-45752</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of the critical section in a migration, the donor shard &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d4970df8517be6aab286d3a0551263b12076e6b3/src/mongo/db/s/migration_source_manager.cpp#L453-L459&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;will send _configsvrCommitChunkMigration&lt;/a&gt; to the config server to complete the migration. If the command fails and the donor shard is in FCV 4.2, the donor attempts to recover the migration&apos;s outcome by doing a write on the config server to recover the latest configOpTime. If this recovery fails, the donor &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d4970df8517be6aab286d3a0551263b12076e6b3/src/mongo/db/s/migration_source_manager.cpp#L522-L527&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;will fassert&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The same operation context is used to send the commit and for the recovery operations, so if it is interrupted (e.g. by a killOp command), the commit and recovery will both fail leading to a crash.&lt;/p&gt;

&lt;p&gt;Notably in FCV &amp;gt;= 4.4, the donor shard instead recovers from a failed commit by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e6468fe7da/src/mongo/db/s/migration_source_manager.cpp#L471&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;repeatedly sending _configsvrEnsureChunkVersionIsGreaterThan&lt;/a&gt;, which also reuses the commit&apos;s operation context but&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/d4970df8517be6aab286d3a0551263b12076e6b3/src/mongo/db/s/migration_util.cpp#L455&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checks for interrupt&lt;/a&gt;, so the migration aborts instead of crashes on interruption.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1113487">SERVER-45752</key>
            <summary>opCtx interruption during migration critical section commit triggers fassert in FCV 4.2</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="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Jan 2020 15:53:23 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:56 +0000</updated>
                            <resolved>Fri, 31 Jan 2020 21:46:11 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2777860" author="xgen-internal-githook" created="Fri, 31 Jan 2020 21:34:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;, &apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45752&quot; title=&quot;opCtx interruption during migration critical section commit triggers fassert in FCV 4.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45752&quot;&gt;&lt;del&gt;SERVER-45752&lt;/del&gt;&lt;/a&gt; opCtx interruption during migration critical section commit triggers fassert in FCV 4.2&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/15801e543a57d999121b6353c6cff401bcff312a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/15801e543a57d999121b6353c6cff401bcff312a&lt;/a&gt;&lt;/p&gt;</comment>
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