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    <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-63857] Synchronize background thread in SleepInterruption dbtest</title>
                <link>https://jira.mongodb.org/browse/SERVER-63857</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;SleepInterrupt&lt;/tt&gt; dbtest launches a background thread to run the Javascript interpreter and then accesses the background thread&apos;s Javascript &lt;tt&gt;Scope&lt;/tt&gt; object to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5ecff9d8651690595e0729f90fa490d62388adab/src/mongo/dbtests/jstests.cpp#L894&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;issue an interrupt&lt;/a&gt;. There is a potential for a use-after-free error if the background thread exits before the parent thread has the chance to issue the interrupt.&lt;/p&gt;

&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5ecff9d8651690595e0729f90fa490d62388adab/src/mongo/dbtests/jstests.cpp#L897&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;long sleep&lt;/a&gt; in the background Javascript task should prevent this scenario, but some test failures seem to indicate that this use-after-free scenario is occurring nonetheless. It is possible that the sleep is somehow failing and returning immediately.&lt;/p&gt;

&lt;p&gt;Synchronizing the background thread so that it waits until it&apos;s safe to destroy its Javascript &lt;tt&gt;Scope&lt;/tt&gt; will hopefully prevent this crash and instead cause the test to fail with a more useful error.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1986811">SERVER-63857</key>
            <summary>Synchronize background thread in SleepInterruption dbtest</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="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                    </labels>
                <created>Sat, 19 Feb 2022 02:13:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:10 +0000</updated>
                            <resolved>Thu, 24 Mar 2022 17:48:24 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4433057" author="JIRAUSER1257640" created="Thu, 24 Mar 2022 17:48:24 +0000"  >&lt;p&gt;Please note that this ticket fixes the use-after-free problem that was manifested in the linked BF so it won&apos;t crash. It is possible that the ever-sleeping background thread failed to sleep and caused it to exit prematurely. This fix will help us reveal the underlying issue if it happens again and it will be captured as a totally different BF.&lt;/p&gt;</comment>
                            <comment id="4431344" author="xgen-internal-githook" created="Thu, 24 Mar 2022 01:46:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63857&quot; title=&quot;Synchronize background thread in SleepInterruption dbtest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63857&quot;&gt;&lt;del&gt;SERVER-63857&lt;/del&gt;&lt;/a&gt; Synchronize background thread in SleepInterruption dbtest&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/384829b6b0b88824a2657d50068bf446664c5cb4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/384829b6b0b88824a2657d50068bf446664c5cb4&lt;/a&gt;&lt;/p&gt;</comment>
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