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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-71207] Lock ordering violation between POS mutex lock and instance mutex lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-71207</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On stepdown, the stepdown thread holds the RSTL and &lt;a href=&quot;https://github.com/10gen/mongo/blob/c7d403c329c56f2fc3ed260dd6e03e7b2feabd5a/src/mongo/db/repl/primary_only_service.cpp#L437&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;POS mutex lock&lt;/a&gt; and calls the instance &lt;a href=&quot;https://github.com/10gen/mongo/blob/c7d403c329c56f2fc3ed260dd6e03e7b2feabd5a/src/mongo/db/repl/primary_only_service.cpp#L427&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;interrupt method&lt;/a&gt; which in-turn tries to acquire instance mutex lock.&#160;On the other hand, the instance state machinery thread can try to &lt;a href=&quot;https://github.com/10gen/mongo/blob/c7d403c329c56f2fc3ed260dd6e03e7b2feabd5a/src/mongo/db/repl/primary_only_service.cpp#L261&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquire POS mutex&lt;/a&gt;  holding instance mutex lock.  This resulted in deadlocks. (See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60872&quot; title=&quot;Deadlock between stepDown and TenantOplogApplier startup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60872&quot;&gt;&lt;del&gt;SERVER-60872&lt;/del&gt;&lt;/a&gt; for historical deadlock scenarios). &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60872&quot; title=&quot;Deadlock between stepDown and TenantOplogApplier startup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60872&quot;&gt;&lt;del&gt;SERVER-60872&lt;/del&gt;&lt;/a&gt; will address those deadlock bugs using quick short-term fix. As part of this ticket, we should come up with a long-term solution.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2179191">SERVER-71207</key>
            <summary>Lock ordering violation between POS mutex lock and instance mutex lock</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                            <label>lowcontext</label>
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                <created>Wed, 9 Nov 2022 14:55:51 +0000</created>
                <updated>Thu, 29 Jun 2023 16:06:22 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
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                            <comment id="4967087" author="suganthi.mani" created="Wed, 9 Nov 2022 15:15:56 +0000"  >&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jason.chan%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jason.chan@mongodb.com&quot;&gt;jason.chan@mongodb.com&lt;/a&gt;&lt;/p&gt;</comment>
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