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    <title>MongoDB Jira</title>
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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-19127] unittest::Test::stopCapturingLogMessages has a sometimes fatal race condition</title>
                <link>https://jira.mongodb.org/browse/SERVER-19127</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The unittest framework offers a facility for capturing log lines for analysis. That framework is not thread safe.  The contract for appenders in the logging system is that they must be internally synchronized, and furthermore, the process of attaching and detaching appenders must be externally synchronized.&lt;/p&gt;

&lt;p&gt;Tests that use this facility and also launch multiple threads can crash if the log capture process is disabled while logging is happening, or if several threads are logging at once. Both of these problems should be mitigated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="213002">SERVER-19127</key>
            <summary>unittest::Test::stopCapturingLogMessages has a sometimes fatal race condition</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="9">Done</resolution>
                                        <assignee username="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Jun 2015 13:57:57 +0000</created>
                <updated>Wed, 25 Jan 2017 22:00:42 +0000</updated>
                            <resolved>Thu, 25 Jun 2015 14:06:45 +0000</resolved>
                                                    <fixVersion>3.1.5</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="950518" author="xgen-internal-githook" created="Thu, 25 Jun 2015 14:05:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19127&quot; title=&quot;unittest::Test::stopCapturingLogMessages has a sometimes fatal race condition&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19127&quot;&gt;&lt;del&gt;SERVER-19127&lt;/del&gt;&lt;/a&gt; Fix race condition in unittest log line capturing.&lt;/p&gt;

&lt;p&gt;The approach of this fix is to first make the appender for capturing log lines&lt;br/&gt;
thread safe, and then to make it very unlikely that bad things happen if a test&lt;br/&gt;
races between logging and detaching the special capture appender.  We make it&lt;br/&gt;
unlikely by taking advantage of the fact that appenders are removed by setting a&lt;br/&gt;
pointer in a vector to NULL, and make sure that the capture appender is not&lt;br/&gt;
destroyed when it is detached, but rather when the test fixture destructor runs.&lt;br/&gt;
This means that if logging only occurs while a test fixture exists (likely if&lt;br/&gt;
tests don&apos;t start threads outside of fixtures), tests will not try to use a&lt;br/&gt;
capture appender that has gone out of scope.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9e0e9bfe233c2600a1b61d5ae45af807da79b824&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9e0e9bfe233c2600a1b61d5ae45af807da79b824&lt;/a&gt;&lt;/p&gt;</comment>
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