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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>[CDRIVER-4185] Access violation when trying to join a thread</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-4185</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;When a new monitor thread fails to create and returns the `EAGAIN` error, we incorrectly assume it has been created. Then when attempting to shutdown the thread later on, we cause an Access Violation in the client application. Some details:&lt;/p&gt;

&lt;p&gt;`thread_create` &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/blob/f9db623e3cea226f9fc40b1fb0aef08e2bdf6d60/src/libmongoc/src/mongoc/mongoc-topology-background-monitoring.c#L161&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;doesn&apos;t check if the creation succeeds or not&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;When we attempt to &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/blob/a4c8c66f3638e59a6acc6733dc8e36b71062fcca/src/libmongoc/src/mongoc/mongoc-topology-background-monitoring.c#L208-L216&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;stop the server monitor thread&lt;/a&gt;, it is assumed that it was already running. The call on `thread_join stop` &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/blob/f9db623e3cea226f9fc40b1fb0aef08e2bdf6d60/src/libmongoc/src/mongoc/mongoc-topology-background-monitoring.c#L339&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;will crash&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;It would be nice if C driver could handle this situation gracefully to avoid crashes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1896808">CDRIVER-4185</key>
            <summary>Access violation when trying to join a thread</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="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="linda.qin@mongodb.com">Linda Qin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Oct 2021 23:00:54 +0000</created>
                <updated>Sat, 28 Oct 2023 11:28:18 +0000</updated>
                            <resolved>Thu, 22 Jun 2023 19:55:59 +0000</resolved>
                                                    <fixVersion>1.24.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5525626" author="xgen-internal-githook" created="Mon, 26 Jun 2023 18:14:15 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;email&apos;: &apos;kevin.albertson@mongodb.com&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-4185&quot; title=&quot;Access violation when trying to join a thread&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-4185&quot;&gt;&lt;del&gt;CDRIVER-4185&lt;/del&gt;&lt;/a&gt; log and do not update state when creating thread fails (#1315)&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;log and do not update state when creating thread fails&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;add `errno_out` arg to mcommon_thread_create&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;return error code&lt;br/&gt;
Branch: r1.24&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/e06751593ee043ea310b47294a22969b56443b94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/e06751593ee043ea310b47294a22969b56443b94&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5519470" author="xgen-internal-githook" created="Thu, 22 Jun 2023 19:55:38 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;email&apos;: &apos;kevin.albertson@mongodb.com&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-4185&quot; title=&quot;Access violation when trying to join a thread&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-4185&quot;&gt;&lt;del&gt;CDRIVER-4185&lt;/del&gt;&lt;/a&gt; log and do not update state when creating thread fails (#1315)&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;log and do not update state when creating thread fails&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;add `errno_out` arg to mcommon_thread_create&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;return error code&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/7d5beeae25e3c821b6e01e204ba6d323184c8b7d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/7d5beeae25e3c821b6e01e204ba6d323184c8b7d&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                    </comments>
                    <attachments>
                            <attachment id="340141" name="mongo-c-driver-thread.png" size="99639" author="linda.qin@mongodb.com" created="Tue, 12 Oct 2021 23:02:22 +0000"/>
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