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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-44274] Coverity analysis defect 113947: Uninitialized scalar variable</title>
                <link>https://jira.mongodb.org/browse/SERVER-44274</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Use of an uninitialized variable&lt;/p&gt;

&lt;p&gt;Defect 113947 (STATIC_C)&lt;br/&gt;
  Checker UNINIT (subcategory none)&lt;br/&gt;
  File:  &lt;tt&gt;/src/mongo/stdx/thread.h&lt;/tt&gt;&lt;br/&gt;
  Function &lt;tt&gt;mongo::stdx::support::SigAltStackController::_uninstall() const&lt;/tt&gt;&lt;br/&gt;
    /src/mongo/stdx/thread.h, line: 88&lt;br/&gt;
    &lt;font color=&quot;red&quot;&gt;Declaring variable &quot;ss&quot; without initializer.&lt;/font&gt; &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;
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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;  margin-top: 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;            stack_t ss;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;    /src/mongo/stdx/thread.h, line: 90&lt;br/&gt;
    &lt;font color=&quot;red&quot;&gt;Using uninitialized value &quot;ss&quot;. Field &quot;ss.ss_sp&quot; is uninitialized when calling &quot;sigaltstack&quot;.&lt;/font&gt; &lt;/p&gt;
&lt;p/&gt;
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&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;   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;            if (sigaltstack(&amp;amp;ss, nullptr)) {&lt;/span&gt;&lt;/pre&gt;
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</description>
                <environment></environment>
        <key id="980861">SERVER-44274</key>
            <summary>Coverity analysis defect 113947: Uninitialized scalar variable</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="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="xgen-internal-coverity">Coverity Collector User</reporter>
                        <labels>
                            <label>coverity</label>
                    </labels>
                <created>Mon, 28 Oct 2019 13:39:19 +0000</created>
                <updated>Sun, 29 Oct 2023 22:15:39 +0000</updated>
                            <resolved>Mon, 28 Oct 2019 16:34:02 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2505059" author="xgen-internal-githook" created="Mon, 28 Oct 2019 16:08:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;BillyDonahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;name&apos;: &apos;Billy Donahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44274&quot; title=&quot;Coverity analysis defect 113947: Uninitialized scalar variable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44274&quot;&gt;&lt;del&gt;SERVER-44274&lt;/del&gt;&lt;/a&gt; zero-initialize stack_t structure&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3519a0af27978023333d26df6f3a921cbd189ca6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3519a0af27978023333d26df6f3a921cbd189ca6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2504982" author="billy.donahue" created="Mon, 28 Oct 2019 15:34:34 +0000"  >&lt;p&gt;&lt;a href=&quot;http://mongodbcr.appspot.com/477670001&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://mongodbcr.appspot.com/477670001&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2504976" author="billy.donahue" created="Mon, 28 Oct 2019 15:33:00 +0000"  >&lt;p&gt;Done. But I think I&apos;ll &quot;fix&quot; it anyway since it&apos;s easy to do.&lt;/p&gt;</comment>
                            <comment id="2504703" author="milkie" created="Mon, 28 Oct 2019 13:56:56 +0000"  >&lt;p&gt;You can mark it False Positive in the interface.&lt;/p&gt;</comment>
                            <comment id="2504658" author="billy.donahue" created="Mon, 28 Oct 2019 13:47:21 +0000"  >&lt;p&gt;Well I&#8217;m sure this isn&#8217;t a defect. If the stack_t&#8217;s ss_flags field has a SS_DISABLE bit set, the other fields of the stack_t are ignored. This is spelled out in the POSIX spec for sigaltstack.&lt;/p&gt;

&lt;p&gt;What do we do with false positives?&lt;/p&gt;</comment>
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