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    <title>MongoDB Jira</title>
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    <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-27742] Do not crash if parent goes missing after fork</title>
                <link>https://jira.mongodb.org/browse/SERVER-27742</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the parent process goes away before the child has a chance to complete initialization, the mongod process will shut down when it tries to send signal USR2 to the parent, indicating that startup is complete. (function signalForkSuccess()).&lt;br/&gt;
It also dies with an unfriendly message:&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;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;2016-10-05T09:22:25.215+0000 I -        [initandlisten] Assertion failure kill(serverGlobalParams.leaderProc.toNative(), 12) == 0 src/mongo/db/initialize_server_global_state.cpp 95&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;I see no reason to crash if the parent process is missing.  Instead, I think we should just log a warning and continue starting up.&lt;/p&gt;</description>
                <environment></environment>
        <key id="346822">SERVER-27742</key>
            <summary>Do not crash if parent goes missing after fork</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="4">Incomplete</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Jan 2017 22:41:28 +0000</created>
                <updated>Tue, 6 Dec 2022 04:07:44 +0000</updated>
                            <resolved>Tue, 18 Aug 2020 19:00:35 +0000</resolved>
                                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3512075" author="JIRAUSER1257841" created="Wed, 2 Dec 2020 10:53:36 +0000"  >&lt;p&gt;If you have this problem, please check you MongoDB log rotate task first.&lt;/p&gt;

&lt;p&gt;While you send SIGUSR1 which is a&#160;log rotate signal to&#160;MongoDB&#160;process, the parent process will be terminated. So this problem will be occur.&#160;&lt;/p&gt;

&lt;p&gt;So, Close you log rotate task while you need a long time to restore you MongoDB.&lt;/p&gt;</comment>
                            <comment id="3345440" author="ben.caimano" created="Tue, 18 Aug 2020 17:15:52 +0000"  >&lt;p&gt;We think this is currently functioning as we would expect.&lt;/p&gt;</comment>
                            <comment id="1482181" author="milkie" created="Sun, 22 Jan 2017 21:46:41 +0000"  >&lt;p&gt;That&apos;s not even a valid assumption today. But i&apos;m fine with just making the error message more friendly when this situation occurs. &lt;/p&gt;</comment>
                            <comment id="1482171" author="schwerin" created="Sun, 22 Jan 2017 20:52:01 +0000"  >&lt;p&gt;Imagine your startup script assumes that mongod crashed when it exits with&lt;br/&gt;
a non-zero code...&lt;/p&gt;

</comment>
                            <comment id="1481426" author="milkie" created="Fri, 20 Jan 2017 17:55:51 +0000"  >&lt;p&gt;I&apos;m not sure.  The parent process can only really go away by being killed, right?  Assuming there are no bugs.  So if something killed the parent process on purpose (perhaps with SIGHUP because the network connection went away), I&apos;m not sure the expected behavior is that the forked process would go away too.  Certainly the user in the linked support ticket did not expect that behavior, but they also weren&apos;t aware of the parent being killed, I suspect.&lt;/p&gt;</comment>
                            <comment id="1480888" author="schwerin" created="Thu, 19 Jan 2017 23:28:01 +0000"  >&lt;p&gt;If the parent process is gone, it will have exited with a non-zero code. As&lt;br/&gt;
such, won&apos;t the caller expect the server to shut down?&lt;/p&gt;

</comment>
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