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            <title>[SERVER-83786] Tighten the guarantee that flow control and ticket acquisition doesn&apos;t lead to circular waits</title>
                <link>https://jira.mongodb.org/browse/SERVER-83786</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The flow control and ticketing systems in theory sit above the locking hierarchy, but there are some exceptions to this rule, most notably multi-statement transactions.&lt;/p&gt;

&lt;p&gt;This inversion of the locking order has been source of bugs in the past, such as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76834&quot; title=&quot;Circular wait dependency between PBWM and ticket acquisition&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76834&quot;&gt;&lt;del&gt;SERVER-76834&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;I am filing this ticket to request that we document somewhere the rules based on which we are certain that there are no deadlocks due to this inversion and possibly to add testing and/or invariants.&lt;br/&gt;
The testing that I am imagining is for example having a successful (albeit slow) concurrency run with a max ticket number of 1.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2513953">SERVER-83786</key>
            <summary>Tighten the guarantee that flow control and ticket acquisition doesn&apos;t lead to circular waits</summary>
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                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
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                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
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                <created>Fri, 1 Dec 2023 14:53:53 +0000</created>
                <updated>Tue, 30 Jan 2024 17:46:33 +0000</updated>
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