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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-17237]  &apos;entry&apos; may be used uninitialized in PlanCache code</title>
                <link>https://jira.mongodb.org/browse/SERVER-17237</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I was upgraded from gcc 4.8.x to 4.9.1 and while building rc8 I get these error messages:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &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-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;g++ -o build/linux2/norm/mongo/db/query/plan_cache.o -c -Wnon-virtual-dtor -Woverloaded-virtual -std=c++11 -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -pipe -Werror -O3 -Wno-unused-local-typedefs -Wno-unused-function -Wno-deprecated-declarations -Wno-unused-but-set-variable -Wno-missing-braces -fno-builtin-memcmp -DBOOST_ALL_NO_LIB -D_SCONS -DMONGO_EXPOSE_MACROS -DSUPPORT_UTF8 -DMONGO_OPTIMIZED_BUILD -DMONGO_BYTE_ORDER=1234 -D_FILE_OFFSET_BITS=64 -DMONGO_HAVE___THREAD -DMONGO_HAVE_CXX11_ATOMICS -DMONGO_HAVE_HEADER_UNISTD_H -DMONGO_HAVE_POSIX_MONOTONIC_CLOCK -DMONGO_HAVE_EXECINFO_BACKTRACE -I/foo/rocksdb/include -I/bar/include -Isrc/third_party/s2 -Isrc/third_party/pcre-8.30 -Isrc/third_party/boost -Ibuild/linux2/norm -Isrc src/mongo/db/query/plan_cache.cpp&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;src/mongo/db/query/plan_cache.cpp: In member function &apos;mongo::Status mongo::PlanCache::getEntry(const mongo::CanonicalQuery&amp;amp;, mongo::PlanCacheEntry**) const&apos;:&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;src/mongo/db/query/plan_cache.cpp:481:34: error: &apos;entry&apos; may be used uninitialized in this function [-Werror=maybe-uninitialized]&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;         *entryOut = entry-&amp;gt;clone();&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;                                  ^&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;src/mongo/db/query/plan_cache.cpp: In member function &apos;mongo::Status mongo::PlanCache::get(const mongo::CanonicalQuery&amp;amp;, mongo::CachedSolution**) const&apos;:&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;src/mongo/db/query/plan_cache.cpp:370:48: error: &apos;entry&apos; may be used uninitialized in this function [-Werror=maybe-uninitialized]&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;         *crOut = new CachedSolution(key, *entry);&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;Looking at the code and LRUKeyValue::get I see that it can return an error without initializing the second argument, so I think this is an error. But my C++ reading skills are rusty.&lt;/p&gt;</description>
                <environment></environment>
        <key id="183438">SERVER-17237</key>
            <summary> &apos;entry&apos; may be used uninitialized in PlanCache code</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="9">Done</resolution>
                                        <assignee username="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="mdcallag">Mark Callaghan</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Feb 2015 00:29:12 +0000</created>
                <updated>Tue, 24 May 2016 15:20:59 +0000</updated>
                            <resolved>Fri, 20 Feb 2015 15:47:23 +0000</resolved>
                                    <version>3.0.0-rc8</version>
                                                    <component>Build</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1273557" author="xgen-internal-githook" created="Tue, 24 May 2016 15:20:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24240&quot; title=&quot;Ubuntu 16.04 on the v3.2 branch needs to compile with the v2 toolchain&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24240&quot;&gt;&lt;del&gt;SERVER-24240&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17237&quot; title=&quot; &amp;#39;entry&amp;#39; may be used uninitialized in PlanCache code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17237&quot;&gt;&lt;del&gt;SERVER-17237&lt;/del&gt;&lt;/a&gt; Suppress warnings with newer compilers&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d54133690a66797b210a6fd1eac408c0516f6d34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d54133690a66797b210a6fd1eac408c0516f6d34&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="833578" author="mdcallag" created="Fri, 20 Feb 2015 15:20:14 +0000"  >&lt;p&gt;Please close it. Sorry for wasting time, still learning how to deal with g++ version upgrades.&lt;/p&gt;</comment>
                            <comment id="833574" author="acm" created="Fri, 20 Feb 2015 15:16:27 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mcallaghan%40fb.com&quot; class=&quot;user-hover&quot; rel=&quot;mcallaghan@fb.com&quot;&gt;mcallaghan@fb.com&lt;/a&gt; - Is there any further action that you would like to see taken regarding this ticket? Otherwise, I would like to close it if it really is a false positive.&lt;/p&gt;</comment>
                            <comment id="831328" author="asya" created="Wed, 18 Feb 2015 02:49:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mdcallag&quot; class=&quot;user-hover&quot; rel=&quot;mdcallag&quot;&gt;mdcallag&lt;/a&gt; you are correct, this appears to be a false positive - we actually use static analysis on all of MongoDB source (Coverity) and it also flags a similar pattern as it&apos;s problematic for any static analysis to track an allocation that depends on a specific value of a different returned variable.&lt;/p&gt;</comment>
                            <comment id="825503" author="mdcallag" created="Tue, 10 Feb 2015 00:35:22 +0000"  >&lt;p&gt;And now I wonder whether this is a bogus bug report as this code might prevent the use of &apos;entry&apos; after an error&lt;/p&gt;

&lt;p&gt;        if (!cacheStatus.isOK()) &lt;/p&gt;
{
            return cacheStatus;
        }</comment>
                    </comments>
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            <issuekey id="288321">SERVER-24240</issuekey>
        </issuelink>
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