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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-38819] record stack trace in handler for WT_PANIC</title>
                <link>https://jira.mongodb.org/browse/SERVER-38819</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, we simply call fassert() in mdb_handle_error().  This eventually calls std::abort(), and lets our signal handler record a stack trace.  &lt;br/&gt;
Unfortunately, because WiredTiger sets a panic flag on the WT connection, this causes all other threads that happen to call into WiredTiger to immediately return WT_PANIC.  These threads will race with the panicking thread for the signal handler.  Depending on who wins the race, we can sometimes record a stack trace that isn&apos;t useful.&lt;/p&gt;

&lt;p&gt;The proposal here is to manually record a stack trace in mdb_handle_error() before calling fassert, thus guaranteeing we get at least one stack trace that shows the actual point of panic.&lt;/p&gt;</description>
                <environment></environment>
        <key id="664840">SERVER-38819</key>
            <summary>record stack trace in handler for WT_PANIC</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="13203">Gone away</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Jan 2019 14:49:22 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:06 +0000</updated>
                            <resolved>Mon, 7 Jan 2019 15:28:18 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2107141" author="milkie" created="Mon, 7 Jan 2019 15:28:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-4518&quot; title=&quot;Give applications a chance to handle panic before API panic returns&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4518&quot;&gt;&lt;del&gt;WT-4518&lt;/del&gt;&lt;/a&gt;&apos;s completion renders this ticket extraneous.&lt;/p&gt;</comment>
                            <comment id="2107106" author="keith.bostic" created="Mon, 7 Jan 2019 15:11:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt;, we pushed &lt;a href=&quot;https://jira.mongodb.org/browse/WT-4518&quot; title=&quot;Give applications a chance to handle panic before API panic returns&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4518&quot;&gt;&lt;del&gt;WT-4518&lt;/del&gt;&lt;/a&gt;, back to you.&lt;/p&gt;</comment>
                            <comment id="2104521" author="milkie" created="Thu, 3 Jan 2019 17:57:55 +0000"  >&lt;p&gt;Yes, that should be part of the work for this ticket.&lt;/p&gt;</comment>
                            <comment id="2104443" author="schwerin" created="Thu, 3 Jan 2019 16:54:18 +0000"  >&lt;p&gt;If we do this, should we switch to fassertFailedNoTrace since the relevant stack trace will already have been logged?&lt;/p&gt;</comment>
                            <comment id="2104308" author="milkie" created="Thu, 3 Jan 2019 15:50:14 +0000"  >&lt;p&gt;Note that this ticket won&apos;t be necessary if we do &lt;a href=&quot;https://jira.mongodb.org/browse/WT-4518&quot; title=&quot;Give applications a chance to handle panic before API panic returns&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4518&quot;&gt;&lt;del&gt;WT-4518&lt;/del&gt;&lt;/a&gt; instead.&lt;/p&gt;</comment>
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            <issuekey id="664847">WT-4518</issuekey>
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