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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-63055] gcov and clang cause failures in ValidateCollections</title>
                <link>https://jira.mongodb.org/browse/SERVER-63055</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60832&quot; title=&quot;Code Coverage variant not generating coverage data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60832&quot;&gt;&lt;del&gt;SERVER-60832&lt;/del&gt;&lt;/a&gt;, we attempted to add support for using gcov with clang. When doing so (with either our v3 or v4 toolchains), new failures can be found in nestedarr1:ValidateCollections and nestedobj1:ValidateCollections in jsCore due to segfaults. Wider spread failures can be found in other tasks.&lt;/p&gt;

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

&lt;p&gt;These failures only occur when using clang and gcov. With gcc, this issue does not occur.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1972592">SERVER-63055</key>
            <summary>gcov and clang cause failures in ValidateCollections</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.egesdahl@mongodb.com">Ryan Egesdahl</assignee>
                                    <reporter username="richard.samuels@mongodb.com">Richard Samuels</reporter>
                        <labels>
                    </labels>
                <created>Thu, 27 Jan 2022 19:43:03 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:30 +0000</updated>
                            <resolved>Mon, 28 Mar 2022 22:01:25 +0000</resolved>
                                                    <fixVersion>5.3.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4440133" author="xgen-internal-githook" created="Mon, 28 Mar 2022 21:53:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ryan Egesdahl&apos;, &apos;email&apos;: &apos;ryan.egesdahl@mongodb.com&apos;, &apos;username&apos;: &apos;deriamis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63055&quot; title=&quot;gcov and clang cause failures in ValidateCollections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63055&quot;&gt;&lt;del&gt;SERVER-63055&lt;/del&gt;&lt;/a&gt; Implement gcov with LLVM&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/05ea8339afabf09c07c43b374a060d8168fe873f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/05ea8339afabf09c07c43b374a060d8168fe873f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4439372" author="ryan.egesdahl" created="Mon, 28 Mar 2022 17:50:59 +0000"  >&lt;p&gt;I&apos;ve merged in from &lt;tt&gt;master&lt;/tt&gt;, and this should be ready to go now. I have a patch build running, and once I know my commit applies correctly on top of the recent &lt;tt&gt;evergreen.yml&lt;/tt&gt; changes, I&apos;ll continue with the merge.&lt;/p&gt;</comment>
                            <comment id="4424011" author="JIRAUSER1257562" created="Mon, 21 Mar 2022 15:20:29 +0000"  >&lt;p&gt;It is blocked on the Evergreen release EVG-16255&lt;/p&gt;

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

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4410322" author="ryan.egesdahl" created="Mon, 14 Mar 2022 15:49:51 +0000"  >&lt;p&gt;My investigation has fairly conclusively demonstrated that the segfaults are caused by optimization being disabled while debug is enabled. We halve the amount of stack space available to the task executor whenever we have debugging enabled, and on Clang with optimization disabled this causes us to exceed the stack size limit, resulting in the observed segfault. We can work around this by simply not halving the stack space limit if optimization is disabled.&lt;/p&gt;

&lt;p&gt;There is still another problem evident in both the GCC and Clang builds (but more so Clang) in that disabling optimization seems to cause some tasks to fail consistently. The failure behavior makes me think there are some tight timeouts set for these tests, and the performance difference without optimization is causing them to be exceeded. I&apos;m not going to do anything about these, but I will be removing the sole &quot;unoptimized&quot; builder we have for Linux in favor of these coverage builders.&lt;/p&gt;</comment>
                            <comment id="4384692" author="ryan.egesdahl" created="Tue, 1 Mar 2022 20:41:04 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=richard.samuels&quot; class=&quot;user-hover&quot; rel=&quot;richard.samuels&quot;&gt;richard.samuels&lt;/a&gt; I&apos;ve tried this a few times now, and Evergreen builds fail with the same segfaults as before. However, &lt;b&gt;local&lt;/b&gt; builds don&apos;t. I still don&apos;t know why that is, and I&apos;ve been having trouble getting any information out of the core dumps to tell me where it&apos;s happening.&lt;/p&gt;</comment>
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            <issuekey id="2038060">SERVER-66134</issuekey>
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