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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>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26797] Illegal cast to StaleConfigException is possible after moveChunk which fails with StaleConfigException</title>
                <link>https://jira.mongodb.org/browse/SERVER-26797</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;moveChunk&lt;/tt&gt; command on the shard was made &lt;a href=&quot;https://github.com/mongodb/mongo/blob/266b947f6e9e021b85746b3b80b723b7d3b2c2f2/src/mongo/db/s/move_chunk_command.cpp#L181&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;rejoinable&lt;/a&gt; for the purpose of supporting recovery of active migrations after balancer step down.&lt;/p&gt;

&lt;p&gt;A command which rejoins will take the status from the command which executed the actual move operation and call &lt;tt&gt;uassertStatusOK&lt;/tt&gt; on it.&lt;/p&gt;

&lt;p&gt;However, the &lt;tt&gt;SendStaleConfig&lt;/tt&gt; error code is treated specially and the resulting &lt;tt&gt;DBException&lt;/tt&gt; is later &lt;a href=&quot;https://github.com/mongodb/mongo/blob/266b947f6e9e021b85746b3b80b723b7d3b2c2f2/src/mongo/db/commands/dbcommands.cpp#L1447&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cast&lt;/a&gt; to &lt;tt&gt;StaleConfigException&lt;/tt&gt;. In this case, such a typecast will be illegal and may lead to accessing invalid memory.&lt;/p&gt;</description>
                <environment></environment>
        <key id="327155">SERVER-26797</key>
            <summary>Illegal cast to StaleConfigException is possible after moveChunk which fails with StaleConfigException</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="9">Done</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Oct 2016 21:16:17 +0000</created>
                <updated>Sat, 19 Nov 2016 00:06:35 +0000</updated>
                            <resolved>Mon, 31 Oct 2016 16:42:13 +0000</resolved>
                                    <version>3.4.0-rc1</version>
                                    <fixVersion>3.4.0-rc3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1421947" author="xgen-internal-githook" created="Mon, 31 Oct 2016 16:39:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;mikety&apos;, u&apos;name&apos;: u&apos;Misha Tyulenev&apos;, u&apos;email&apos;: u&apos;misha@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26797&quot; title=&quot;Illegal cast to StaleConfigException is possible after moveChunk which fails with StaleConfigException&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26797&quot;&gt;&lt;del&gt;SERVER-26797&lt;/del&gt;&lt;/a&gt; protect upcast to StaleConfigException from DBException&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2142a7da82ced30ba3e7564d049e1f0021c909bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2142a7da82ced30ba3e7564d049e1f0021c909bb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1421026" author="kaloian.manassiev" created="Fri, 28 Oct 2016 20:28:51 +0000"  >&lt;p&gt;Discussed the issue in person and we decided to remove the &lt;tt&gt;SendStaleConfigException&lt;/tt&gt; which is thrown from MigrationSourceManager and replace it with a regular DBException with error code of &lt;tt&gt;StaleEpoch&lt;/tt&gt;. Originally, when moveChunk was initiated by &lt;tt&gt;mongos&lt;/tt&gt; it was possible that a stale mongos was used and the &lt;tt&gt;SendStaleConfigException&lt;/tt&gt; was necessary in order to bring it up to date. However, in 3.4, with the balancer running on the CSRS primary, having stale chunk information is no longer possible and this exception is of no use.&lt;/p&gt;</comment>
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