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    <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-64243] Fix segmentation fault in gperftools during backtrace</title>
                <link>https://jira.mongodb.org/browse/SERVER-64243</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;gperftools seems to have an issue during stack frame walking where sometimes it will attempt to dereference an invalid address due to not having frame pointers.&lt;/p&gt;

&lt;p&gt;During discussion of the issue we identified some possible resolutions for this problem:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;We could make a decision to stop using gperftools debug allocation mode. But we internally seem to be using it.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;We could work with upstream gperftools to make forward progress on a patch that seems to fix this but &lt;a href=&quot;https://github.com/gperftools/gperftools/pull/865&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;has been pending to be merged since 2017&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;We could work with upstream gperftools and/or libunwind to fix the performance issue so that we can let debugallocation use libunwind, which doesn&apos;t need frame pointers.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1995651">SERVER-64243</key>
            <summary>Fix segmentation fault in gperftools during backtrace</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Mar 2022 12:00:33 +0000</created>
                <updated>Thu, 7 Dec 2023 18:20:46 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5852449" author="JIRAUSER1264163" created="Fri, 3 Nov 2023 15:01:39 +0000"  >&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler@mongodb.com&quot;&gt;blake.oler@mongodb.com&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4525593" author="acm" created="Wed, 4 May 2022 14:04:57 +0000"  >&lt;p&gt;Well, I tried the happy path here of seeing if the newer libunwind didn&apos;t introduce the egregious performance slowdowns we observed in the past when using it as the stack capture mechanism for tcmalloc&apos;s debugallocation infrastructure, but unfortunately  the results were not good, with lots of task timeouts due to significantly increased test runtime. So I think that approach will not work.&lt;/p&gt;</comment>
                            <comment id="4394654" author="JIRAUSER1264163" created="Mon, 7 Mar 2022 12:11:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;One way we could fix this in our codebase is to essentially copy and modify the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/third_party/gperftools/dist/src/stacktrace_generic-inl.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;generic backtrace implementation&lt;/a&gt; with a call to libunwind&apos;s &lt;a href=&quot;https://www.nongnu.org/libunwind/man/unw_backtrace(3).html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;backtrace implementation&lt;/a&gt; at the cost of not knowing the stack frame size. This would quite possibly not be able to get merged upstream due to removing features from the current implementation though.&lt;/p&gt;</comment>
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