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    <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-67251] Strictly tie the ServiceStateMachine::Impl lifetime to its enclosing ServiceStateMachine</title>
                <link>https://jira.mongodb.org/browse/SERVER-67251</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Strongly couple the &lt;tt&gt;SSM::Impl&lt;/tt&gt; lifecycle to its enclosing SSM.&lt;/p&gt;

&lt;p&gt;Currently the &lt;tt&gt;SSM::Impl&lt;/tt&gt; is held by shared_ptr and has a different lifespan from its enclosing SSM, which is undocumented and will be a source of confusing bugs because Impl is supposed just be an information hiding device, not a separable entity with a distinct lifespan. So while the Impl is being kept alive by lambda callback anchors and interacting with the rest of the system, the system might reasonably assume the associated SSM is alive, which it isn&#8217;t.&lt;/p&gt;

&lt;p&gt;Replace SSM&#8217;s &lt;tt&gt;shared_ptr&amp;lt;Impl&amp;gt;&lt;/tt&gt; with a &lt;tt&gt;unique_ptr&amp;lt;Impl&amp;gt;&lt;/tt&gt;, and use shared_ptr aliasing when necessary, so that a &lt;tt&gt;shared_ptr&amp;lt;Impl&amp;gt;&lt;/tt&gt; will count as a reference to its enclosing &lt;tt&gt;shared_ptr&amp;lt;SSM&amp;gt;&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Remove &lt;tt&gt;std::enable_shared_from_this&lt;/tt&gt; base class from &lt;tt&gt;SSM::Impl&lt;/tt&gt;. Add it to SSM instead.&lt;/p&gt;

&lt;p&gt;Callback anchors in Impl should be generated with a function that performs a &lt;tt&gt;shared_from_this&lt;/tt&gt; on the enclosing SSM and produces an aliased &lt;tt&gt;shared_ptr&amp;lt;Impl&amp;gt;&lt;/tt&gt; from it, so you still get a &lt;tt&gt;shared_ptr&amp;lt;Impl&amp;gt;&lt;/tt&gt; but it hold a ref on the whole SSM.&lt;/p&gt;


&lt;p&gt;This &lt;b&gt;might&lt;/b&gt; be responsible for BF-22149, an unsolved BF in SEPImpl wherein an invalid iterator is used to erase an SSM. No direct evidence for this, but the lifespan issue feels like it could be relevant, since the dangling list iterator is bound to a callback held by the &lt;tt&gt;SSM::Impl&lt;/tt&gt; as its &lt;tt&gt;cleanupHook&lt;/tt&gt;, but is used to remove an &lt;tt&gt;SSM&lt;/tt&gt; from a list. It&apos;s very suspicious in light of this ticket here.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2067844">SERVER-67251</key>
            <summary>Strictly tie the ServiceStateMachine::Impl lifetime to its enclosing ServiceStateMachine</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="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="13201">Fixed</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Jun 2022 03:44:31 +0000</created>
                <updated>Sun, 29 Oct 2023 21:36:52 +0000</updated>
                            <resolved>Fri, 17 Jun 2022 18:25:06 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4624261" author="xgen-internal-githook" created="Fri, 17 Jun 2022 16:39:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67251&quot; title=&quot;Strictly tie the ServiceStateMachine::Impl lifetime to its enclosing ServiceStateMachine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67251&quot;&gt;&lt;del&gt;SERVER-67251&lt;/del&gt;&lt;/a&gt; strictly bind SSM::Impl lifetime to its SSM&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/67e37f8e806a6a5d402e20eee4b3097e2b11f820&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/67e37f8e806a6a5d402e20eee4b3097e2b11f820&lt;/a&gt;&lt;/p&gt;</comment>
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