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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-66562] Audit, document all functions accessed by sync signal handlers</title>
                <link>https://jira.mongodb.org/browse/SERVER-66562</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Signal handlers for sync signals (SIGSEGV etc) are making calls to diagnostic functions like &lt;tt&gt;printStackTrace&lt;/tt&gt;, setBreakpoint, etc, or even LOGV2 macros. There&apos;s a possibility that these functions could make blocking calls or try to acquire resources that the call thread already holds, yielding a deadlock or undefined behavior.&lt;/p&gt;

&lt;p&gt;We should make sure that any library calls (logging, stacktracing, etc) used from a signal handler are clearly marked as safe for that purpose. If there&apos;s an alternative no-resource path into those libraries (e.g. new &quot;emergency logging&quot; calls, or &lt;tt&gt;printStackTrace(mallocFreeOStream)&lt;/tt&gt;, we should audit the call path from the signal handler to make sure it&apos;s using those more conservative functions.&lt;/p&gt;

&lt;p&gt;We should clearly mark those functions as being called from signal handlers to prevent them from using inappropriate functions. This includes their error paths, which can&apos;t e.g. use LOGV2 to report errors. There should be a central block of documentation describing these restrictions in the &lt;tt&gt;signal_handlers_synchronous.cpp&lt;/tt&gt; file.&lt;/p&gt;

&lt;p&gt;Changes to these functions should proactively seek to Cc the appropriate context-holding reviewers, as they could introduce subtle side effects.&lt;/p&gt;

&lt;p&gt;(split from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63843&quot; title=&quot;Don&amp;#39;t allow recursive doLog in synchronous signal handlers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63843&quot;&gt;&lt;del&gt;SERVER-63843&lt;/del&gt;&lt;/a&gt;)&lt;/p&gt;
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                <environment></environment>
        <key id="2049895">SERVER-66562</key>
            <summary>Audit, document all functions accessed by sync signal handlers</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 May 2022 19:27:54 +0000</created>
                <updated>Thu, 7 Dec 2023 20:24:23 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
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