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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-48146] FailPoint usage is unsafe at static init and shutdown time</title>
                <link>https://jira.mongodb.org/browse/SERVER-48146</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;FailPoint objects are designed to be defined as nonlocal objects, and referred to in arbitrary code paths as e.g. `if (failpoint.shouldFail()) ...` to provide test injection and instrumentation. Calls to FailPoint::shouldFail must to be correct even before the failpoint initializer has run, or after the failpoint has been destroyed.&lt;/p&gt;

&lt;p&gt;We can fix it by making FailPoint objects into trivial facade objects using std::aligned_storage that lazily initializes its state when member functions are called.&lt;/p&gt;

&lt;p&gt;For performance paths that are known to be lifetime-safe, we can use an accessor to get at the unchecked state of the FailPoint, skipping the atomic initializer guard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1348462">SERVER-48146</key>
            <summary>FailPoint usage is unsafe at static init and shutdown time</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="13201">Fixed</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                            <label>servicearch-wfbf-day</label>
                    </labels>
                <created>Tue, 12 May 2020 17:28:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:19 +0000</updated>
                            <resolved>Thu, 17 Dec 2020 13:16:22 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3533898" author="xgen-internal-githook" created="Thu, 17 Dec 2020 05:17:51 +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-48146&quot; title=&quot;FailPoint usage is unsafe at static init and shutdown time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48146&quot;&gt;&lt;del&gt;SERVER-48146&lt;/del&gt;&lt;/a&gt; init-safe, shutdown-safe failpoint&lt;/p&gt;

&lt;p&gt;invariant on use of pre-init FailPoint objects&lt;br/&gt;
Minimize public API surface with Impl.&lt;br/&gt;
Some renames to try to align old names with new code.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/42dae28cbff75e5e71199bdb6946673fc61b3436&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/42dae28cbff75e5e71199bdb6946673fc61b3436&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3524613" author="billy.donahue" created="Thu, 10 Dec 2020 10:57:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://mongodbcr.appspot.com/748170001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/748170001/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3494165" author="billy.donahue" created="Tue, 17 Nov 2020 18:16:43 +0000"  >&lt;p&gt;Candidate for the &lt;tt&gt;StaticImmortal&lt;/tt&gt; wrapper type.&lt;/p&gt;</comment>
                            <comment id="3081725" author="jason.carey" created="Tue, 12 May 2020 19:21:18 +0000"  >&lt;p&gt;I think we should consider on the other side simply leaking fail points.  The construction side is less of a concern for me (because any code meant to run in the server will already have to wait for the initializer graph (until after we&apos;ve processed test commands enabled)).  The shutdown side is compelling, but I suspect that leaking fail points is an easier to think about solution than requiring fail points to be plain data&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="1570673">SERVER-53409</issuekey>
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