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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-80303] Investigate bug in which gdb usage is not possible on a spawnhost if the failure came from a *san variant</title>
                <link>https://jira.mongodb.org/browse/SERVER-80303</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If an engineer attempts to debug a variant failure on a spawnhost, AND the variant was a *san configuration, gdb will NOT work on the spawnhost.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;On sanitizer variants we build with separate-debug=off which includes the debugsymbols inside of the binaries. The setup_spawnhosts scripts does some stuff which modifies the binary which makes the binary not work with gdb. If you download the binary from evergreen it does work.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Max h hypothesized that adding the .gdb_index section into the executable itself (separate-debug=off) causes gdb to not recognize the executable as having produced the core dump and therefore refuses to load the debug symbols from the executable&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Original slack thread: &lt;a href=&quot;https://mongodb.slack.com/archives/CR8SNBY0N/p1692653657122299&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodb.slack.com/archives/CR8SNBY0N/p1692653657122299&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2423187">SERVER-80303</key>
            <summary>Investigate bug in which gdb usage is not possible on a spawnhost if the failure came from a *san variant</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="daniel.moody@mongodb.com">Daniel Moody</assignee>
                                    <reporter username="trevor.guidry@mongodb.com">Trevor Guidry</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Aug 2023 13:59:31 +0000</created>
                <updated>Mon, 6 Nov 2023 19:37:48 +0000</updated>
                            <resolved>Thu, 26 Oct 2023 16:16:05 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5810434" author="xgen-internal-githook" created="Thu, 26 Oct 2023 15:36:25 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Moody&apos;, &apos;email&apos;: &apos;dmoody256@gmail.com&apos;, &apos;username&apos;: &apos;dmoody256&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80303&quot; title=&quot;Investigate bug in which gdb usage is not possible on a spawnhost if the failure came from a *san variant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80303&quot;&gt;&lt;del&gt;SERVER-80303&lt;/del&gt;&lt;/a&gt; make spawnhost script avoid gdbindex for embedded debug files&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9e9571ac1b1aedccbbdfad5c8776d71577d074ff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9e9571ac1b1aedccbbdfad5c8776d71577d074ff&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5657367" author="max.hirschhorn@10gen.com" created="Thu, 24 Aug 2023 18:35:03 +0000"  >&lt;p&gt;I did an experiment to see if it would be possible to use &lt;tt&gt;objcopy&lt;/tt&gt; and &lt;tt&gt;strip&lt;/tt&gt; to split the debug info into a separate file (such that, if successful, then we could build the index on the separate debug files like we do for other artifacts). GDB did &lt;b&gt;not&lt;/b&gt; recognize the executable file after it was stripped as being the one which produced the core dump which precluded the ability to load the debug symbols.&lt;/p&gt;

&lt;p&gt;I think the only choice may be to skip generating a gdb index when the executable was compiled with &amp;#45;&amp;#45;separate&amp;#45;debug=off. That is, the setup&amp;#95;spawnhost&amp;#95;coredump script will leave the executable files entirely alone in this case. GDB can then interpret the core dump with its startup time being slower due to the absence of a gdb index.&lt;/p&gt;</comment>
                            <comment id="5657310" author="JIRAUSER1271042" created="Thu, 24 Aug 2023 18:15:03 +0000"  >&lt;p&gt;The problem is that on spawnhosts gdb does not correctly work with the binaries that are outputted from out setup spawnhost script if they were built with `separate-debug=off`. Currently this is limited to our sanitizer variants because those are the ones we build with `separate-debug=off`.&lt;/p&gt;</comment>
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