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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-30932] dbCheck command violates lock ordering by acquiring lock on &quot;local&quot; database first</title>
                <link>https://jira.mongodb.org/browse/SERVER-30932</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c31e309846609b4309a72868db7eafc189f839ca/src/mongo/db/repl/dbcheck.cpp#L371&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The &lt;tt&gt;AutoGetDbForDbCheck&lt;/tt&gt; RAII class first attempts to acquire a lock on the &quot;local&quot; database in &lt;tt&gt;MODE_IX&lt;/tt&gt; and then attempts to acquire a lock on the database to check in &lt;tt&gt;MODE_S&lt;/tt&gt;&lt;/a&gt;. This is incompatible with the lock ordering that other database operations use when calling &lt;tt&gt;repl::logOp()&lt;/tt&gt; because other threads will first attempt to acquire a lock on the database and then attempt to acquire a lock on the &quot;local&quot; database.&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;
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						&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;AutoGetDbForDbCheck::AutoGetDbForDbCheck(OperationContext* opCtx, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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; NamespaceString&amp;amp; nss)&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;    : localLock(opCtx, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;local&quot;&lt;/span&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;_sd, MODE_IX), agd(opCtx, nss.db(), MODE_S) {}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="423068">SERVER-30932</key>
            <summary>dbCheck command violates lock ordering by acquiring lock on &quot;local&quot; database first</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="3">Duplicate</resolution>
                                        <assignee username="josef.ahmad@mongodb.com">Josef Ahmad</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Sat, 2 Sep 2017 13:33:52 +0000</created>
                <updated>Thu, 9 Dec 2021 14:04:16 +0000</updated>
                            <resolved>Thu, 9 Dec 2021 14:04:15 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4238596" author="josef.ahmad" created="Thu, 9 Dec 2021 14:04:16 +0000"  >&lt;p&gt;This issue was resolved in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61748&quot; title=&quot;dbCheck should not hold a strong database lock during batches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61748&quot;&gt;&lt;del&gt;SERVER-61748&lt;/del&gt;&lt;/a&gt; which removed the local database lock acquisition.&lt;/p&gt;</comment>
                            <comment id="1668560" author="max.hirschhorn@10gen.com" created="Fri, 8 Sep 2017 21:58:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt; and I discussed this issue in-person - I think we&apos;re on the same page now that the locking order in the &quot;dbCheck&quot; thread is incorrect. It sounds like this locking order was chosen to avoid an issue when using the MMAPv1 storage engine since the MMAPv1 flush lock is taken the same mode as the first global lock acquisition. We&apos;ll likely need to acquire the global lock in an intent mode explicitly in addition to swapping the lock order to work around both issues.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.12/src/mongo/db/concurrency/lock_state.cpp#L299&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.12/src/mongo/db/concurrency/lock_state.cpp#L299&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.12/src/mongo/db/concurrency/lock_state.cpp#L826&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.12/src/mongo/db/concurrency/lock_state.cpp#L826&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="1664369" author="ian@10gen.com" created="Tue, 5 Sep 2017 14:11:35 +0000"  >&lt;p&gt;Leaving in Triage for now.  Geert to talk to Max about it.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                                        </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="426818">SERVER-31070</issuekey>
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            <issuelink>
            <issuekey id="1933966">SERVER-61748</issuekey>
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