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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-53049] stdx::condition invariants and segfaults in unittest framework</title>
                <link>https://jira.mongodb.org/browse/SERVER-53049</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While working on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53035&quot; title=&quot;provide a way to ASSERT from a non-main thread in unit tests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53035&quot;&gt;&lt;del&gt;SERVER-53035&lt;/del&gt;&lt;/a&gt; unittest::ThreadAssertionMonitor, it was found that stdx::condition_variable would segfault or hit invariants where std::condition would succeed reliably.&lt;/p&gt;

&lt;p&gt;The segfaults and invariants were observed in the SharedFuture concurrency tests, which are the first clients of the ThreadAssertionMonitor.&lt;/p&gt;

&lt;p&gt;There&apos;s a note in thread_assertion_monitor.h, next to the _cv variable about it.&lt;br/&gt;
Changing _cv back to stdx::condition_variable for experimentation should reproduce the bug. It was readily observable.&lt;/p&gt;

&lt;p&gt;It&apos;s also possible that ThreadAssertionMonitor&apos;s use of _cv is incorrect somehow and we haven&apos;t thought about it hard enough to see how.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1550711">SERVER-53049</key>
            <summary>stdx::condition invariants and segfaults in unittest framework</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Nov 2020 06:22:23 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:35 +0000</updated>
                            <resolved>Tue, 24 Nov 2020 16:29:40 +0000</resolved>
                                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3503802" author="billy.donahue" created="Tue, 24 Nov 2020 16:29:40 +0000"  >
&lt;p&gt;This was a bug in the test.&lt;/p&gt;

&lt;p&gt;Fixed before submission.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://mongodbcr.appspot.com/720450002/diff2/739890011:711630001/src/mongo/util/future_test_shared_future.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/720450002/diff2/739890011:711630001/src/mongo/util/future_test_shared_future.cpp&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I think it&apos;s probably the case that stdx::condition_variable simply interacts with other threads in such a way as to exacerbate the bug more than std::condition_variable did.&lt;/p&gt;</comment>
                            <comment id="3503215" author="billy.donahue" created="Tue, 24 Nov 2020 06:40:57 +0000"  >&lt;p&gt; &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/288528/288528_test.out&quot; title=&quot;test.out attached to SERVER-53049&quot;&gt;test.out&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; is a sample failure.&lt;br/&gt;
Test is also observed to deadlock.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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            <issuekey id="1550234">SERVER-53035</issuekey>
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                            <attachment id="288528" name="test.out" size="10662" author="billy.donahue@mongodb.com" created="Tue, 24 Nov 2020 06:40:19 +0000"/>
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