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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-54739] Race in ServerDiscoveryMonitor::requestImmediateCheck could lead to multiple outstanding exhaust requests</title>
                <link>https://jira.mongodb.org/browse/SERVER-54739</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When ServerDiscoveryMonitor::requestImmediateCheck is called, in some cases, we attempt to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd5979b18572c26ac44b36c8e5e32972c12a82d5/src/mongo/client/server_discovery_monitor.cpp#L183-L184&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cancel the outstanding hello request and reschedule a new one&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Cancelling the previous request uses a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd5979b18572c26ac44b36c8e5e32972c12a82d5/src/mongo/client/server_discovery_monitor.cpp#L391&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CallbackHandle object&lt;/a&gt; that is set &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd5979b18572c26ac44b36c8e5e32972c12a82d5/src/mongo/client/server_discovery_monitor.cpp#L233&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;after scheduling the request&lt;/a&gt;, which happens &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd5979b18572c26ac44b36c8e5e32972c12a82d5/src/mongo/client/server_discovery_monitor.cpp#L194-L200&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;after a delay&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This means the following sequence of events could occur:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;A call to ServerDiscoveryMonitor::requestImmediateCheck occurs, which calls &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd5979b18572c26ac44b36c8e5e32972c12a82d5/src/mongo/client/server_discovery_monitor.cpp#L187-L209&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_scheduleNextHello&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;The task it schedules to do the exhaust command hangs &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd5979b18572c26ac44b36c8e5e32972c12a82d5/src/mongo/client/server_discovery_monitor.cpp#L199&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;before actually scheduling the command&lt;/a&gt; and setting the callback handle.&lt;/li&gt;
	&lt;li&gt;A new call to requestImmediateCheck arrives. It tries to cancel the outstanding request, but the callback handle hasn&apos;t actually been set yet.&lt;/li&gt;
	&lt;li&gt;The first request continues, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd5979b18572c26ac44b36c8e5e32972c12a82d5/src/mongo/client/server_discovery_monitor.cpp#L233&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setting the callback handle&lt;/a&gt;, which may or may not overwrite the existing one. Either way we end up with two concurrent exhaust commands running for the same host, one of which is no longer tracked or cancellable.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="1631222">SERVER-54739</key>
            <summary>Race in ServerDiscoveryMonitor::requestImmediateCheck could lead to multiple outstanding exhaust requests</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Feb 2021 23:00:42 +0000</created>
                <updated>Tue, 6 Dec 2022 01:33:57 +0000</updated>
                            <resolved>Thu, 25 Feb 2021 22:17:26 +0000</resolved>
                                    <version>4.4.4</version>
                                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
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            <issuekey id="1631214">SERVER-54738</issuekey>
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