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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>
    </build-info>


<item>
            <title>[SERVER-63710] CSFLE: LeakSanitizer warnings after unloading the dynamic library</title>
                <link>https://jira.mongodb.org/browse/SERVER-63710</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On Linux, if an application &lt;tt&gt;dlopens&lt;/tt&gt; the csfle dynamic library then &lt;tt&gt;dlcloses&lt;/tt&gt; the library, LeakSanitizer later warns about memory leaks during program exit. Omitting the call to &lt;tt&gt;dlclose&lt;/tt&gt; (or opening with &lt;tt&gt;RTLD_NODELETE&lt;/tt&gt;) causes the leaks to vanish. No library APIs need be invoked for the behavior to show.&lt;/p&gt;

&lt;p&gt;LeakSanitizer is unable to render the symbols, unfortunately, as the dynamic library has been unloaded from the memory mappings before LeakSanitizer catches the issue at program shutdown. Our best guess is that this is most likely leaking in statically constructed objects that are built up during &lt;tt&gt;dlopen&lt;/tt&gt; as part of library initialization, but those same objects are never destroyed as part of &lt;tt&gt;dlclose&lt;/tt&gt;. This has a visible effect in LeakSanitizer, but means that other possible important side-effects of static destructors will also never occur.&lt;/p&gt;

&lt;p&gt;Possible hint: &lt;a href=&quot;https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71971&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71971&lt;/a&gt; which relates to a quirk of ELF and ld-linux when static symbols are annotated with &lt;tt&gt;UNIQUE&lt;/tt&gt;, however no symbols in the library appear to have that annotation. I can verify that the call of &lt;tt&gt;dlopen&lt;/tt&gt; transitively invokes &lt;tt&gt;__cxa_atexit&lt;/tt&gt; to register static destructors, but I do not know why they do not run on &lt;tt&gt;dlclose&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Because &lt;tt&gt;dlopen&lt;/tt&gt; is smart enough not to allocate duplicate mappings in case of repeated &lt;tt&gt;dlopen&lt;/tt&gt; of the same library, it is safe to never close the library and let the static destructors run at program shutdown. This is a viable workaround unless we need to rely on static destructors running immediately on &lt;tt&gt;dlclose&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;The following code is enough to reproduce the issue:&lt;/p&gt;


&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; *lib = ::dlopen (&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;/path/to/mongo_csfle_v1.so&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, RTLD_NOW | RTLD_GLOBAL);&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 2;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1984347">SERVER-63710</key>
            <summary>CSFLE: LeakSanitizer warnings after unloading the dynamic library</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-security">Backlog - Security Team</assignee>
                                    <reporter username="colby.pike@mongodb.com">Colby Pike</reporter>
                        <labels>
                            <label>FLE</label>
                            <label>csfle</label>
                    </labels>
                <created>Wed, 16 Feb 2022 00:33:16 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:06 +0000</updated>
                            <resolved>Thu, 24 Feb 2022 16:43:14 +0000</resolved>
                                                                    <component>Field Level Encryption</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4376621" author="JIRAUSER1256529" created="Fri, 25 Feb 2022 12:19:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mark.benvenuto&quot; class=&quot;user-hover&quot; rel=&quot;mark.benvenuto&quot;&gt;mark.benvenuto&lt;/a&gt; I get that this is a fairly minor issue, but that doesn&#8217;t seem true. On my Linux system (glibc 2.31), I can download the shared library, attach a breakpoint to a static destructor in gdb, and watch it being run as part of the library&#8217;s destructors via &lt;tt&gt;__cxa_finalize&lt;/tt&gt;, as it should (complete standalone bash script repro: &lt;a href=&quot;https://0bin.corp.mongodb.com/paste/toPNRJEj#SOlZIdqnEuz1JRV8QkmNeHqrIWlYQDV01KZgiEuhWSL&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://0bin.corp.mongodb.com/paste/toPNRJEj#SOlZIdqnEuz1JRV8QkmNeHqrIWlYQDV01KZgiEuhWSL&lt;/a&gt;). That also holds true for other small C++ example shared libraries.&lt;/p&gt;

&lt;p&gt;By modifying the test code from that script (or from the ticket description) to call &lt;tt&gt;__cxa_finalize&lt;/tt&gt; directly, i.e.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  void(*cxa_finalize)(void*) = (void(*)(void*))dlsym(handle, &quot;__cxa_finalize&quot;);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;instead of &lt;tt&gt;dlclose(handle)&lt;/tt&gt;, one can avoid the problem mentioned in the ticket description here (that leak detection tools have trouble getting proper symbols because dlclose() prevents them from getting them), but still get proper leak detection. E.g. with &lt;tt&gt;gcc -o test test.c -ldl &amp;amp;&amp;amp; valgrind --leak-check=full --show-leak-kinds=all ./test&lt;/tt&gt;, one can get results like these:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;==19247== 16 bytes in 1 blocks are still reachable in loss record 3 of 3,332&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;==19247==    at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;==19247==    by 0x659E8F7: operator new(unsigned long) (in /tmp/o/lib/mongo_csfle_v1.so)&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;==19247==    by 0x61CFE5A: void std::vector&amp;lt;mongo::PeriodicTask*, std::allocator&amp;lt;mongo::PeriodicTask*&amp;gt; &amp;gt;::_M_realloc_insert&amp;lt;mongo::PeriodicTask* const&amp;amp;&amp;gt;(__gnu_cxx::__normal_iterator&amp;lt;mongo::PeriodicTask**, std::vector&amp;lt;mongo::PeriodicTask*, std::allocator&amp;lt;mongo::PeriodicTask*&amp;gt; &amp;gt; &amp;gt;, mongo::PeriodicTask* const&amp;amp;) (in /tmp/o/lib/mongo_csfle_v1.so)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;==19247==    by 0x61CF40F: mongo::PeriodicTask::PeriodicTask() (in /tmp/o/lib/mongo_csfle_v1.so)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;==19247==    by 0x526AD2F: __static_initialization_and_destruction_0(int, int) [clone .constprop.1107] (in /tmp/o/lib/mongo_csfle_v1.so)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;which point to lines in source like: &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/626672c9de5486f48c234b709e019d927a7121b2/src/mongo/base/initializer.cpp#L196&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/626672c9de5486f48c234b709e019d927a7121b2/src/mongo/base/initializer.cpp#L196&lt;/a&gt; or&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo/blob/4741ef2d5ca6a0809c2569cc55142bb1f7ed7547/src/mongo/util/stacktrace_somap.cpp#L345&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/4741ef2d5ca6a0809c2569cc55142bb1f7ed7547/src/mongo/util/stacktrace_somap.cpp#L345&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;which are obviously &lt;b&gt;real&lt;/b&gt;, if limited, memory leaks.&lt;/p&gt;

&lt;p&gt;So the tl;dr here is: Static destructors &lt;b&gt;do&lt;/b&gt; run, but not all of the mongo codebase is doing RAII for global singletons.&lt;/p&gt;

&lt;p&gt;That means that there is something actionable here. Currently, on Linux, libmongocrypt will not unload the shared library to avoid memory leaks from repeated loads, on other platforms it will unload the library. I assume that for now, libmongocrypt should not unload the shared library on &lt;b&gt;all&lt;/b&gt; platforms to sidestep this problem.&lt;/p&gt;

&lt;p&gt;Whether this is worth taking action on in the server code is a question that I can&#8217;t answer. It&#8217;s not obvious to me why the examples above require heap allocation, but I&#8217;m sure somebody spent time thinking about that and I don&#8217;t really want to spend more time digging into this, since I&#8217;m really standing more on the sidelines here than actively being involved anyway.&lt;/p&gt;</comment>
                            <comment id="4375146" author="mark.benvenuto" created="Thu, 24 Feb 2022 18:53:49 +0000"  >&lt;p&gt;I do not know of other C++ libraries where this may work. The static destructors are stored in the &lt;tt&gt;.dtors&lt;/tt&gt; section and not being called on &lt;tt&gt;dlclose&lt;/tt&gt; on Linux. &lt;/p&gt;</comment>
                            <comment id="4374803" author="JIRAUSER1256529" created="Thu, 24 Feb 2022 17:00:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mark.benvenuto&quot; class=&quot;user-hover&quot; rel=&quot;mark.benvenuto&quot;&gt;mark.benvenuto&lt;/a&gt; Do you happen to know why this happens only with this shared library, not others?&lt;/p&gt;</comment>
                            <comment id="4374712" author="mark.benvenuto" created="Thu, 24 Feb 2022 16:43:14 +0000"  >&lt;p&gt;As the ticket states, this is unfortunately by design with the way glibc unloads the library and how it does not call static destructors. &lt;/p&gt;

&lt;p&gt;While the library tries to support unload, there is nothing we can do if the underlying OS dynamic library loader does not call static destructors.&lt;/p&gt;</comment>
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