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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42244] Dump LockManager on shutdown and via a command</title>
                <link>https://jira.mongodb.org/browse/SERVER-42244</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a deadlock occurs, it would be helpful to dump the lock manager to help diagnose the deadlock. Ideally, we could also dump the stack trace of the threads in the deadlock. This will be similar to the hang analyzer which uses GDB.&lt;/p&gt;</description>
                <environment></environment>
        <key id="858796">SERVER-42244</key>
            <summary>Dump LockManager on shutdown and via a command</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Jul 2019 23:27:14 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:03 +0000</updated>
                            <resolved>Wed, 9 Oct 2019 22:25:08 +0000</resolved>
                                                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="2780957" author="geert.bosch" created="Mon, 3 Feb 2020 19:09:27 +0000"  >&lt;p&gt;I&apos;m very skeptical about doing anything that requires locking or similar in unclean shutdown. When we hit an invariant, the system is in a state where the best thing we can do is crash quickly. If we need to wait for a mutex, we depend on other threads making progress while we&apos;re in the process of crashing. We may creating deadlocks purely as result of this extra locking, or end up with a half hung process rather than a crashed process, which may be worse.&lt;/p&gt;
</comment>
                            <comment id="2475458" author="milkie" created="Thu, 10 Oct 2019 13:00:24 +0000"  >&lt;p&gt;Where&apos;s the epic?&lt;/p&gt;</comment>
                            <comment id="2474813" author="jason.carey" created="Wed, 9 Oct 2019 22:24:58 +0000"  >&lt;p&gt;The main problem here is that you either take a global lock to dump the process before global shutdown (which may prevent successful stepdowns), or you take it after you&apos;ve killed all the user ops.  Where you&apos;ve probably already broken the deadlock by killing all the ops.&lt;/p&gt;

&lt;p&gt;We need to do more investigations about how to dump interesting information about locks held, but we&apos;ll have to defer that to a future epic about improved diagnosibility of hangs.&lt;/p&gt;</comment>
                            <comment id="2377248" author="ratika.gandhi" created="Mon, 19 Aug 2019 15:09:12 +0000"  >&lt;p&gt;Siyuan and Jason discussed about creating an epic to track this work. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mira.carey%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;mira.carey@mongodb.com&quot;&gt;mira.carey@mongodb.com&lt;/a&gt; will add the details of the conversation here.&#160;&lt;/p&gt;</comment>
                            <comment id="2357824" author="ratika.gandhi" created="Mon, 5 Aug 2019 15:25:10 +0000"  >&lt;p&gt;Will be discussed a part of the &apos;Make Mongodb Diagnostics and observability best in class&apos; tactical goal.&lt;/p&gt;</comment>
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