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    <title>MongoDB Jira</title>
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    <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-6817] Continue research on tcmalloc static initialization crash</title>
                <link>https://jira.mongodb.org/browse/SERVER-6817</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="47791">SERVER-6817</key>
            <summary>Continue research on tcmalloc static initialization crash</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="backlog-server-devplatform">[DO NOT ASSIGN] Backlog - Server Development Platform Team (SDP)</assignee>
                                    <reporter username="ian@mongodb.com">Ian Whalen</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Aug 2012 21:40:12 +0000</created>
                <updated>Tue, 6 Dec 2022 05:30:20 +0000</updated>
                            <resolved>Wed, 17 Jun 2020 19:44:14 +0000</resolved>
                                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3212888" author="acm" created="Wed, 17 Jun 2020 19:44:14 +0000"  >&lt;p&gt;I&apos;m closing this as gone away. It is an eight year old ticket and I have no evidence that it is still an issue. Major changes to our linking environment have taken place since the era in which this was found. We can always re-open it if needed, but I suspect we would do better with a newer ticket with more details in any case.&lt;/p&gt;</comment>
                            <comment id="155780" author="schwerin" created="Wed, 22 Aug 2012 16:05:42 +0000"  >&lt;p&gt;By instruction-stepping the execution of the first call to the ::log() function in the crashing build, I discovered that in this particular version of libc (glibc-2.11.3-17.39.1, SUSE 11), the selection of which log function to use is made during libm&apos;s static initialization.  On this system, ::log() looks up a global function pointer, g_amd_libm_ep_log, and jumps straight to that.  Before libm&apos;s static initialization, rather than initialize this field to a safe default, it is initialized to NULL, making it impossible to call log() before libm&apos;s static initialization.  This is &lt;em&gt;different&lt;/em&gt; from resolving the log() function&apos;s symbol dynamically at runtime.  That part totally works, though the jump trampoline that log() uses looks a lot like the plt jump trampoline, which led to some earlier confusion.&lt;/p&gt;

&lt;p&gt;This comes up because tc_malloc() is supplied in the mongod binary, causing mongod to depend on libm directly, but libselinux, which calls malloc during its static initialization, does not (and cannot) know of its implicit dependency on libm through the resolved mongod symbol, &quot;tc_malloc&quot;.&lt;/p&gt;</comment>
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            <issuekey id="47020">SERVER-6759</issuekey>
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            <issuekey id="50966">SERVER-7084</issuekey>
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