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    <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-79648] Investigate why dbcheck deadlock with fsyncLock with blocked insert op</title>
                <link>https://jira.mongodb.org/browse/SERVER-79648</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;These tests utilize &apos;fsyncLock&apos; and subsequently wait for an insert operation to be blocked by checking the inprogress &apos;currentOp&apos;, leading to a deadlock with the dbCheck process.&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;jstests/core/administrative/current_op/currentop.js&lt;/li&gt;
	&lt;li&gt;jstests/core/fsync.js&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We need to know why the deadlock is happening.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2407666">SERVER-79648</key>
            <summary>Investigate why dbcheck deadlock with fsyncLock with blocked insert op</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="m.maher@mongodb.com">Moustafa Maher</assignee>
                                    <reporter username="m.maher@mongodb.com">Moustafa Maher</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Aug 2023 02:22:40 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:31 +0000</updated>
                            <resolved>Fri, 18 Aug 2023 19:18:29 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5643997" author="JIRAUSER1257896" created="Fri, 18 Aug 2023 19:16:20 +0000"  >&lt;p&gt;&lt;ins&gt;The deadlock analysis:&lt;/ins&gt;&lt;br/&gt;
Test goes through these 3 steps:&lt;br/&gt;
1- FsynLock&lt;br/&gt;
2- Do an insert and wait for the currentOp to show that the insert is waiting for lock (the flusher).&#160; (&amp;lt;&amp;lt; &lt;b&gt;Times out waiting for the curOps when dbcheck is on&lt;/b&gt; &amp;gt;&amp;gt; )&lt;br/&gt;
3- FsyncUnlock and let the insert to succeed.&#160;&lt;/p&gt;

&lt;p&gt;when &lt;b&gt;fsyncLock&lt;/b&gt; is on, multiple threads takes &lt;b&gt;writeTickets&lt;/b&gt; and blocked on the &lt;b&gt;Flusher&lt;/b&gt;, and then other threads can&#8217;t take any more tickets using either &lt;b&gt;&lt;tt&gt;PriorityTicketHolder&lt;/tt&gt;&lt;/b&gt;&#160;and&#160;&lt;b&gt;&lt;tt&gt;SemaphoreTicketHolder&lt;/tt&gt;&lt;/b&gt; ,because there are no more tickets available as our tests sets the limit &lt;b&gt;wiredTigerConcurrentWriteTransactions: 30&lt;/b&gt;, so what dbcheck does that it takes writeTickets while trying to write the oplog for the dbcheck and then block on the flusher, so when the insert from the test comes it didn&apos;t find any writeTickets and waits for it and it didn&apos;t even AquireCollection so the curOp doesn&apos;t get logged.&lt;br/&gt;
&#160;&lt;/p&gt;</comment>
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