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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-82459] Fall back to default signal handler when a thread receives two signals</title>
                <link>https://jira.mongodb.org/browse/SERVER-82459</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8e4b5670df9b9fe814e57cb5f3f8ee9407237b5a/src/mongo/util/signal_handlers_synchronous.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/8e4b5670df9b9fe814e57cb5f3f8ee9407237b5a/src/mongo/util/signal_handlers_synchronous.cpp&lt;/a&gt; , the server defines signal-handlers for a variety of signals that can be synchronously generated, like SIGSEGV and SIGABRT. The signal-handling action for these signals is defined to be some version of logging a fatal error, collecting and logging a backtrace, and the exiting. When a thread receives a second such signal (e.g., it&apos;s handling an abort and the signal handler segfaults), the second signal handler calls &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8e4b5670df9b9fe814e57cb5f3f8ee9407237b5a/src/mongo/util/signal_handlers_synchronous.cpp#L182&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;quickExit&lt;/a&gt;, which may call into logging (risky when we&apos;re two signal handlers deep) and doesn&apos;t call into the default signal handler. This means we won&apos;t get a core dump in this case. We should call `endProcessWithSignal`.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2483597">SERVER-82459</key>
            <summary>Fall back to default signal handler when a thread receives two signals</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="ryan.berryhill@mongodb.com">Ryan Berryhill</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                    </labels>
                <created>Thu, 26 Oct 2023 14:31:42 +0000</created>
                <updated>Thu, 16 Nov 2023 15:31:51 +0000</updated>
                            <resolved>Wed, 15 Nov 2023 14:59:30 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="5880737" author="xgen-internal-githook" created="Wed, 15 Nov 2023 00:14:36 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ryan Berryhill&apos;, &apos;email&apos;: &apos;ryan.berryhill@mongodb.com&apos;, &apos;username&apos;: &apos;ryanberryhill&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82459&quot; title=&quot;Fall back to default signal handler when a thread receives two signals&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82459&quot;&gt;&lt;del&gt;SERVER-82459&lt;/del&gt;&lt;/a&gt; Avoid quickExit when a thread receives two fatal signals&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b02caa1884fd508fa78d77fca4fa52c8764c8ea5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b02caa1884fd508fa78d77fca4fa52c8764c8ea5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5865564" author="billy.donahue" created="Wed, 8 Nov 2023 20:22:37 +0000"  >&lt;p&gt;New plan after Zoom discussion.&lt;/p&gt;

&lt;p&gt;We&apos;re already doing a check on a global.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;explicit&lt;/span&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; MallocFreeOStreamGuard() : _lk(_streamMutex, stdx::defer_lock) {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;        &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if&lt;/span&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; (terminateDepth++) {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;            quickExit(ExitCode::abrupt);&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;        }&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;        _lk.lock();&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;I think the problem is perhaps that this &lt;tt&gt;quickExit&lt;/tt&gt; call needs to be more immediate death.&lt;/p&gt;

&lt;p&gt;Regarding &lt;tt&gt;_lk&lt;/tt&gt;: By the time this body runs, the &lt;tt&gt;_lk&lt;/tt&gt; has been initialized, but with a defer_lock meaning that it doesn&apos;t lock it. It just unlocks it later in the destructor. You have to get to the &lt;tt&gt;_lk.lock()&lt;/tt&gt; statement for that.  That means nothing happens to the mutex really in that &lt;tt&gt;_lk&lt;/tt&gt; initializer. The &lt;tt&gt;_lk&lt;/tt&gt; object is just remembering which mutex to unlock later if necessary.&lt;/p&gt;

&lt;p&gt;So yeah the problem with this whole handler is probably the &lt;tt&gt;quickExit&lt;/tt&gt; trying to do stuff.&lt;br/&gt;
For example, &lt;tt&gt;quickExit&lt;/tt&gt; calls &lt;tt&gt;warnIfTripwireAssertionsOccurred&lt;/tt&gt; .  I wonder if that would explain why the bug is hard to repro? If and only if there is a tripwire assertion in the lifetime of the process, we&apos;ll try to &lt;tt&gt;LOGV2&lt;/tt&gt; from the signal handler.  That &lt;tt&gt;warnIfTripwireAssertionsOccurred&lt;/tt&gt; is potentially the whole problem...&lt;br/&gt;
But we don&apos;t want our process to &quot;exit&quot;, we want to be killed by a signal so the kernel will dump core and return an appropriately alarming wstatus to our launcher.&lt;/p&gt;

&lt;p&gt;So I&apos;m thinking the &lt;tt&gt;quickExit&lt;/tt&gt; needs to go but we&apos;re otherwise ok.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2500826">SERVER-83271</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2049895">SERVER-66562</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2488066">SERVER-82658</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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