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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-77869] op_msg_fuzzer should disable global logging</title>
                <link>https://jira.mongodb.org/browse/SERVER-77869</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;op_msg_fuzzer invokes a large body of code, which may use logging. Because log message include thread names stored in thread local variables, logging uses thread local state. libfuzzer binaries do not have hooks into global shutdown. The only way to cleanly tear down state is to declare a global static destructor. These destructors run after thread local variables are destroyed. Accessing thread local variables in a destructor is UB. op_msg_fuzzer uses systems which log in shutdown. Thus, we should turn off logging.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2361165">SERVER-77869</key>
            <summary>op_msg_fuzzer should disable global logging</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="spencer.jackson@mongodb.com">Spencer Jackson</assignee>
                                    <reporter username="spencer.jackson@mongodb.com">Spencer Jackson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Jun 2023 14:22:09 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:22 +0000</updated>
                            <resolved>Mon, 12 Jun 2023 14:11:05 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc6</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5531229" author="xgen-internal-githook" created="Wed, 28 Jun 2023 15:20:13 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Spencer Jackson&apos;, &apos;email&apos;: &apos;spencer.jackson@mongodb.com&apos;, &apos;username&apos;: &apos;spencerjackson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77869&quot; title=&quot;op_msg_fuzzer should disable global logging&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77869&quot;&gt;&lt;del&gt;SERVER-77869&lt;/del&gt;&lt;/a&gt; Disable logging in op_msg_fuzzer&lt;/p&gt;

&lt;p&gt;libfuzzer takes control over program lifecycle. It allows us to define&lt;br/&gt;
a fuzz function, and static variables. It does not allow us to define&lt;br/&gt;
a shutdown function. That means, our only opportunity to tear down&lt;br/&gt;
global state is in a static destructor. Static destructors fire after&lt;br/&gt;
thread local variables destruct. Unfortunately, our global state&lt;br/&gt;
includes systems which log on shutdown. Our logging system uses&lt;br/&gt;
thread_local variables. If we try to log in static destruction, that&lt;br/&gt;
will cause us to access destructed state.&lt;/p&gt;

&lt;p&gt;We need to disable logging, in order to avoid this.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a80eeedcaf69d32ecb29e3231b7af1f7601feb8f)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cc7877356dc634a062180940ee4ea442a056adee&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cc7877356dc634a062180940ee4ea442a056adee&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5490793" author="xgen-internal-githook" created="Sun, 11 Jun 2023 23:16:21 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Spencer Jackson&apos;, &apos;email&apos;: &apos;spencer.jackson@mongodb.com&apos;, &apos;username&apos;: &apos;spencerjackson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77869&quot; title=&quot;op_msg_fuzzer should disable global logging&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77869&quot;&gt;&lt;del&gt;SERVER-77869&lt;/del&gt;&lt;/a&gt; Disable logging in op_msg_fuzzer&lt;/p&gt;

&lt;p&gt;libfuzzer takes control over program lifecycle. It allows us to define&lt;br/&gt;
a fuzz function, and static variables. It does not allow us to define&lt;br/&gt;
a shutdown function. That means, our only opportunity to tear down&lt;br/&gt;
global state is in a static destructor. Static destructors fire after&lt;br/&gt;
thread local variables destruct. Unfortunately, our global state&lt;br/&gt;
includes systems which log on shutdown. Our logging system uses&lt;br/&gt;
thread_local variables. If we try to log in static destruction, that&lt;br/&gt;
will cause us to access destructed state.&lt;/p&gt;

&lt;p&gt;We need to disable logging, in order to avoid this.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a80eeedcaf69d32ecb29e3231b7af1f7601feb8f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a80eeedcaf69d32ecb29e3231b7af1f7601feb8f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2332298">SERVER-76852</issuekey>
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