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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-37717] Race between Baton::notify() and Waitable::wait()</title>
                <link>https://jira.mongodb.org/browse/SERVER-37717</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If &lt;tt&gt;notify()&lt;/tt&gt; is called after the Baton&apos;s &lt;tt&gt;run()&lt;/tt&gt; method does its final check of the queue and the point where &lt;tt&gt;wait()&lt;/tt&gt; relocks the mutex, it will push an empty task to the queue which won&apos;t have a chance to run before the Baton is detached from the OperationContext. This causes an invariant failure when &lt;tt&gt;detach()&lt;/tt&gt; asserts that the queue is empty.&lt;/p&gt;

&lt;p&gt;This race also exists in 4.0 with a larger window: any time the operation is killed between the last call to &lt;tt&gt;run()&lt;/tt&gt; and the call to &lt;tt&gt;detach()&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;The fix for both branches will be to not schedule the empty task on killop and instead just always tap the event fd.&lt;/p&gt;

&lt;p&gt;Until this is fixed, it can be worked around by setting the &lt;tt&gt;AsyncRequestsSenderUseBaton&lt;/tt&gt; server parameter to false.&lt;/p&gt;</description>
                <environment></environment>
        <key id="623055">SERVER-37717</key>
            <summary>Race between Baton::notify() and Waitable::wait()</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Oct 2018 17:41:15 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:14 +0000</updated>
                            <resolved>Sat, 17 Nov 2018 00:06:57 +0000</resolved>
                                    <version>4.0.0</version>
                    <version>4.1.4</version>
                                    <fixVersion>4.0.5</fixVersion>
                    <fixVersion>4.1.6</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2068526" author="xgen-internal-githook" created="Tue, 20 Nov 2018 23:29:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;, &apos;username&apos;: &apos;RedBeard0531&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37717&quot; title=&quot;Race between Baton::notify() and Waitable::wait()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37717&quot;&gt;&lt;del&gt;SERVER-37717&lt;/del&gt;&lt;/a&gt; Fix race between killOp and Baton::detach()&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8977f3efe6691be7c6b8bc3f3f4f75333f990dd1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8977f3efe6691be7c6b8bc3f3f4f75333f990dd1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2050656" author="xgen-internal-githook" created="Fri, 2 Nov 2018 20:00:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;, &apos;username&apos;: &apos;RedBeard0531&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37717&quot; title=&quot;Race between Baton::notify() and Waitable::wait()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37717&quot;&gt;&lt;del&gt;SERVER-37717&lt;/del&gt;&lt;/a&gt; Fix race between Baton::notify() and Waitable::wait()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bdfe090c66532ea921b4968a32632331c0c44310&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bdfe090c66532ea921b4968a32632331c0c44310&lt;/a&gt;&lt;/p&gt;</comment>
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