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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-60621] Investigate if we can ban upgrading the global lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-60621</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Upgrading the global lock mode without first releasing the lock held can have bad side effects (namely deadlock and resource exhaustion). We&apos;ve removed some cases where this can happen (most recently in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59219&quot; title=&quot;Investigate whether the RecordStore oplogDiskLocRegister() and waitForAllEarlierOplogWritesToBeVisible() functions can deadlock due to ticket exhaustion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59219&quot;&gt;&lt;del&gt;SERVER-59219&lt;/del&gt;&lt;/a&gt;). We think we can explicitly ban this behavior in code, as it could help us identify additional bugs we haven&apos;t hit yet, and avoid future ones. That said, there are some instances where we currently upgrade the global lock, and we&apos;ll need to fix these first.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1896377">SERVER-60621</key>
            <summary>Investigate if we can ban upgrading the global lock</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="fausto.leyva@mongodb.com">Fausto Leyva</assignee>
                                    <reporter username="dan.larkin-york@mongodb.com">Dan Larkin-York</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Oct 2021 14:55:02 +0000</created>
                <updated>Sun, 29 Oct 2023 21:47:31 +0000</updated>
                            <resolved>Fri, 3 Feb 2023 19:19:59 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5166775" author="JIRAUSER1253362" created="Fri, 3 Feb 2023 19:20:00 +0000"  >&lt;p&gt;Since all global lock upgrades are banned, the objective of this ticket has been met.&#160;&lt;/p&gt;

&lt;p&gt;Closing this ticket and moving the rest of the work to ban all lock upgrades to ticket: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73040&quot; title=&quot;Ban all lock upgrades&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73040&quot;&gt;&lt;del&gt;SERVER-73040&lt;/del&gt;&lt;/a&gt;.&#160;&lt;/p&gt;</comment>
                            <comment id="5060202" author="louis.williams" created="Fri, 16 Dec 2022 14:38:52 +0000"  >&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn@mongodb.com&quot;&gt;max.hirschhorn@mongodb.com&lt;/a&gt; pointed it out, we discovered that a specific deadlock is possible due to lock conversions:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;T1					T2&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;---------------------------------------&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;IS			&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;					S&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;convert IX -&amp;gt; blocks&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;					convert X -&amp;gt; blocks&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66145&quot; title=&quot;Identify and fix locations that write while holding read tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66145&quot;&gt;&lt;del&gt;SERVER-66145&lt;/del&gt;&lt;/a&gt; is now merged, global lock upgrades are effectively banned, but using tickets as a proxy. Since some operations don&apos;t acquire tickets, and because there are more locks than just the global lock, we should use this ticket to eliminate upgrades on all locks. Any dangerous upgrades should be evaluated for backport consideration.&lt;/p&gt;</comment>
                            <comment id="4568810" author="louis.williams" created="Tue, 24 May 2022 11:15:22 +0000"  >&lt;p&gt;I would like to consider banning all lock upgrades, not just global lock upgrades. We can start just with locks in the global hierarchy.&lt;/p&gt;</comment>
                            <comment id="4224560" author="xgen-internal-githook" created="Wed, 1 Dec 2021 16:20:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dan Larkin-York&apos;, &apos;email&apos;: &apos;dan.larkin-york@mongodb.com&apos;, &apos;username&apos;: &apos;dhly-etc&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60621&quot; title=&quot;Investigate if we can ban upgrading the global lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60621&quot;&gt;&lt;del&gt;SERVER-60621&lt;/del&gt;&lt;/a&gt; Avoid global lock upgrade in some C++ tests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2939d2ce7e46094a5a151f55040a577fed9a3e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2939d2ce7e46094a5a151f55040a577fed9a3e6&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1928683">SERVER-61601</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1928852">SERVER-61609</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1933284">SERVER-61733</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1935245">SERVER-61786</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1935415">SERVER-61788</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1935416">SERVER-61789</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2051341">SERVER-66609</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2080321">SERVER-67695</issuekey>
        </issuelink>
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                                        <issuelink>
            <issuekey id="2237425">SERVER-73040</issuekey>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2038401">SERVER-66145</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2053634">SERVER-66719</issuekey>
        </issuelink>
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