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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-67466] Internal transactions API may be memory unsafe when outer OperationContext is interrupted</title>
                <link>https://jira.mongodb.org/browse/SERVER-67466</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67016&quot; title=&quot;Transaction API transactions should be interrupted if their caller is&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67016&quot;&gt;&lt;del&gt;SERVER-67016&lt;/del&gt;&lt;/a&gt; made it so when the outer OperationContext is interrupted (e.g. due to a stepdown), then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3fa2961b6463ffa5a1ef1211ed2162965fa9cb19/src/mongo/db/transaction_api.cpp#L104-L106&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the cancellation token used by the transaction API will be canceled&lt;/a&gt;. This is important to ensure the operations running within the internal transaction are themselves eventually interrupted. However, canceling the cancellation source isn&apos;t sufficient to ensure the tasks running on the transaction API&apos;s executor have actually completely finished running. This means it is still possible for the outer OperationContext to be interrupted, for the cancellation source to be canceled, but for SyncTransactionWithRetries::runNoThrow() to return and the server to destroy the original command request before the task running on the transaction API&apos;s executor have drained.&lt;/p&gt;

&lt;p&gt;Take the &amp;#95;configsvrRefineCollectionShardKey command for example. The &amp;#95;configsvrRefineCollectionShardKey command calls ShardingCatalogManager::refineCollectionShardKey() using a ShardKeyPattern with an underlying BSONObj which has its lifetime bound to the &amp;#95;configsvrRefineCollectionShardKey command request. If the OperationContext of the refineCollectionShardKey is interrupted (e.g. via the killOp command), then a task running in the task running on the transaction API&apos;s executor may continue to refer to the underlying BSONObj&apos;s memory even after it has been released.&lt;/p&gt;

&lt;p&gt;Instead, the transaction API should additionally wait for the tasks running on the transaction API&apos;s executor to have all settled after canceling the cancellation source. This way none of the captures of the lambda &lt;tt&gt;callback&lt;/tt&gt; may still be in use after SyncTransactionWithRetries::runNoThrow() has returned up the stack.&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;auto txnFuture = _txn-&amp;gt;run(std::move(callback))&lt;/span&gt;&lt;/pre&gt;
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				&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;auto txnResult = txnFuture.getNoThrow(opCtx);&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 the source to guarantee the transaction will terminate if our opCtx was interrupted.&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;_source.cancel();&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;txnFuture.wait()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="2074739">SERVER-67466</key>
            <summary>Internal transactions API may be memory unsafe when outer OperationContext is interrupted</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="sanika.phanse@mongodb.com">Sanika Phanse</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>sharding-nyc-subteam3</label>
                    </labels>
                <created>Wed, 22 Jun 2022 23:25:48 +0000</created>
                <updated>Sun, 29 Oct 2023 21:36:32 +0000</updated>
                            <resolved>Thu, 14 Jul 2022 21:12:08 +0000</resolved>
                                    <version>6.0.0-rc10</version>
                                    <fixVersion>6.0.3</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4881523" author="xgen-internal-githook" created="Thu, 6 Oct 2022 02:34:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sanika Phanse&apos;, &apos;email&apos;: &apos;sanika.phanse@mongodb.com&apos;, &apos;username&apos;: &apos;sphanse99&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67466&quot; title=&quot;Internal transactions API may be memory unsafe when outer OperationContext is interrupted&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67466&quot;&gt;&lt;del&gt;SERVER-67466&lt;/del&gt;&lt;/a&gt; Internal transactions API may be memory unsafe when outer OperationContext is interrupted&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c3932575cb49845903e96e4c26c8e53f707f93f6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c3932575cb49845903e96e4c26c8e53f707f93f6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4680462" author="xgen-internal-githook" created="Thu, 14 Jul 2022 20:41:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sanika Phanse&apos;, &apos;email&apos;: &apos;sanika.phanse@mongodb.com&apos;, &apos;username&apos;: &apos;sphanse99&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67466&quot; title=&quot;Internal transactions API may be memory unsafe when outer OperationContext is interrupted&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67466&quot;&gt;&lt;del&gt;SERVER-67466&lt;/del&gt;&lt;/a&gt; Internal transactions API may be memory unsafe when outer OperationContext is interrupted&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/31efb07ad4029fb56f5a850a7f330330e155961f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/31efb07ad4029fb56f5a850a7f330330e155961f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2097427">SERVER-68237</issuekey>
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            <issuekey id="1671706">SERVER-55813</issuekey>
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