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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-64191] Ensure `Session::cancelAsyncOperations` complies with the contract</title>
                <link>https://jira.mongodb.org/browse/SERVER-64191</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/4f3626ff4486e672569699dfde1cc0ae8c54d348/src/mongo/transport/session.h#L133-L137&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Here&lt;/a&gt; is the contract for &lt;tt&gt;cancelAsyncOperations&lt;/tt&gt;:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/**&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; * Cancel any outstanding async operations. There is no way to cancel synchronous calls.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; * Futures will finish with an ErrorCodes::CallbackCancelled error if they haven&apos;t already&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; * completed.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; */&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;virtual&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; cancelAsyncOperations(&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; BatonHandle&amp;amp; handle = nullptr) = 0;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The only implementation for &lt;tt&gt;cancelAsyncOperations&lt;/tt&gt; is the one that &lt;tt&gt;SessionASIO&lt;/tt&gt; provides, which calls into &lt;tt&gt;BatonASIO::cancelSession&lt;/tt&gt; to remove the session from the underlying networking baton (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a90eac974885febfc2499ca4c431e1d0ac20270e/src/mongo/transport/session_asio.cpp#L224-L227&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;). This, however, does not ensure that outstanding operations for the session are canceled/interrupted. Consider the following:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The networking baton (i.e., &lt;tt&gt;BatonASIO&lt;/tt&gt;) notices activity on the file handle corresponding to one of the sessions, returns from polling, and starts processing the continuation for that session. This, for instance, could result in running &lt;a href=&quot;https://github.com/mongodb/mongo/blob/272b9e0bd2425ae15766b198de0f6a1a522bf8d3/src/mongo/transport/session_asio.h#L446-L485&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this continuation&lt;/a&gt; for read operations.&lt;/li&gt;
	&lt;li&gt;Another thread calls &lt;tt&gt;cancelAsyncOperations&lt;/tt&gt; for this session, with the goal of canceling all async operations. This, however, doesn&apos;t have any impact since the session is already removed from the networking baton (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/ef2a62dcc27461d2be1b619c75bc04effa1f2021/src/mongo/transport/baton_asio_linux.cpp#L373-L374&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;see here&lt;/a&gt;).&lt;/li&gt;
	&lt;li&gt;The continuation mentioned earlier may attempt to add the session to the baton again (e.g., from &lt;a href=&quot;https://github.com/mongodb/mongo/blob/272b9e0bd2425ae15766b198de0f6a1a522bf8d3/src/mongo/transport/session_asio.h#L579&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; for &lt;tt&gt;opportunisticRead&lt;/tt&gt;). This is despite the original request to cancel all ongoing asynchronous operations for the session.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The expected outcome for this ticket is to write a test that mimics the behavior described above and reproduce this issue. Next, we should devise a cancelation mechanism that ensures &lt;tt&gt;SessionASIO&lt;/tt&gt; keeps track of all of its asynchronous operations and awaits their cancelation before returning from &lt;tt&gt;cancelAsyncOperations&lt;/tt&gt;. Note that &lt;tt&gt;cancelAsyncOperations&lt;/tt&gt; does not have to await completion of asynchronous tasks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1994381">SERVER-64191</key>
            <summary>Ensure `Session::cancelAsyncOperations` complies with the contract</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="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Mar 2022 22:44:31 +0000</created>
                <updated>Sun, 29 Oct 2023 21:41:38 +0000</updated>
                            <resolved>Thu, 28 Apr 2022 16:41:46 +0000</resolved>
                                    <version>6.0 Desired</version>
                                    <fixVersion>6.1.0-rc0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4513811" author="xgen-internal-githook" created="Thu, 28 Apr 2022 16:37:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64191&quot; title=&quot;Ensure `Session::cancelAsyncOperations` complies with the contract&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64191&quot;&gt;&lt;del&gt;SERVER-64191&lt;/del&gt;&lt;/a&gt; Strictly order cancellation/scheduling of async operations on `Session`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2255f824d44caf48f9c8b0e23ffaf8483f4e0afe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2255f824d44caf48f9c8b0e23ffaf8483f4e0afe&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                                                <inwardlinks description="split from">
                                        <issuelink>
            <issuekey id="1916210">SERVER-61192</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2109707">SERVER-68680</issuekey>
        </issuelink>
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                                                        </issuelinktype>
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