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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>
    </build-info>


<item>
            <title>[DOCS-13974] Investigate changes in SERVER-51068: HierarchicalAcquisitionLevelViolation messages are cryptic</title>
                <link>https://jira.mongodb.org/browse/DOCS-13974</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Latch violations now have different error messages. The details about where the violated latch was instantiated have been reorganized and expanded. The new log message upon error looks like so:&lt;br/&gt;
{&lt;br/&gt;
  &quot;t&quot;:&lt;/p&gt;
&lt;div class=&quot;error&quot;&gt;&lt;span class=&quot;error&quot;&gt;Unknown macro: {
    &amp;quot;$date&amp;quot;}&lt;/span&gt; &lt;/div&gt;
&lt;p&gt;,&lt;br/&gt;
  &quot;s&quot;:&quot;F&quot;,&lt;br/&gt;
  &quot;c&quot;:&quot;-&quot;,&lt;br/&gt;
  &quot;id&quot;:5106803,&lt;br/&gt;
  &quot;ctx&quot;:&quot;main&quot;,&lt;br/&gt;
  &quot;msg&quot;:&quot;Theoretical deadlock found on use of latch&quot;,&lt;br/&gt;
  &quot;attr&quot;:{&lt;br/&gt;
    &quot;reason&quot;:&quot;Latch released before other latch of lower level&quot;,&lt;br/&gt;
    &quot;latch&quot;:&lt;/p&gt;
&lt;div class=&quot;error&quot;&gt;&lt;span class=&quot;error&quot;&gt;Unknown macro: {
      &amp;quot;name&amp;quot;}&lt;/span&gt; &lt;/div&gt;
&lt;p&gt;,&lt;br/&gt;
  }&lt;br/&gt;
}&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    What actually happened here? I can&apos;t figure it out. I don&apos;t think the code being reported on is incorrect, but maybe it is. I can&apos;t tell from this message.&#160;The diagnostic feature should be able to explain what its expectations were and how they were unmet.&lt;/p&gt;

&lt;p&gt;Clearly there was a deadlock concern that was triggered. I think this message should try to answer some basic questions to be useful. Which locks were involved? What order were they acquired? Why is that a concern? Right now I just have no idea what&apos;s wrong.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;js_test:agg_expr_fuzzer-1278c-1600474428419-0&amp;#93;&lt;/span&gt; 2020-09-19T00:13:59.732+0000 d20020| 2020-09-19T00:13:59.731+00:00 F - 23093 &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; &quot;Fatal assertion&quot;,&quot;attr&quot;: { msgid: 31360, error: &quot;HierarchicalAcquisitionLevelViolation: Theoretical deadlock alert - InvalidWasPresent latch acquisition at src/mongo/util/synchronized_value.h:149 on latch synchronized_value::_mutex&quot;, file: &quot;src/mongo/util/latch_analyzer.cpp&quot;, line: 231 }&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://logkeeper.mongodb.org/lobster/build/1fe9647b6f97d7b1cbc3f12477d979cd/test/5f654d43c2ab684a40168b65#bookmarks=0%2C39%2C71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://logkeeper.mongodb.org/lobster/build/1fe9647b6f97d7b1cbc3f12477d979cd/test/5f654d43c2ab684a40168b65#bookmarks=0%2C39%2C71&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This is stated in terms of implementation details of the latch analyzer. As someone who&apos;s just writing lock and unlock statements, I really shouldn&apos;t have to drill into the enums and figure out how it happened. Much richer information is available to the site that threw the assertion, but wasn&apos;t brought out in the log statement.&lt;/p&gt;

&lt;p&gt;It looks like all the synchronized_value objects in the codebase will have the same identity string. It would be helpful in this case to have known what T was.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1535957">DOCS-13974</key>
            <summary>Investigate changes in SERVER-51068: HierarchicalAcquisitionLevelViolation messages are cryptic</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="13202">Works as Designed</resolution>
                                        <assignee username="andrew.feierabend@mongodb.com">Andrew Feierabend</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Nov 2020 16:38:57 +0000</created>
                <updated>Mon, 13 Nov 2023 18:01:52 +0000</updated>
                            <resolved>Wed, 16 Jun 2021 21:57:25 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
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            <issuekey id="1481182">SERVER-51068</issuekey>
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