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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-48116] init-order bug inside pcrecpp</title>
                <link>https://jira.mongodb.org/browse/SERVER-48116</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The fiasco is within pcrecpp.&lt;/p&gt;

&lt;p&gt;If we make an RE object too soon, it will reference some internal global state in the &lt;tt&gt;RE::Init&lt;/tt&gt; pseudo-constructor, which might not yet be initialized. This benchmark is getting ProcessInfo at static init time, which gathers a lot of process metadata.&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;This call to &lt;tt&gt;getNumAvailableCores&lt;/tt&gt; is the culprit. That function isn&apos;t currently safe at static init time.&lt;br/&gt;
It incidentally causes an RE to be made for parsing the &lt;tt&gt;/proc/mountinfo&lt;/tt&gt; file, before RE&apos;s static default_options object is initialized.&lt;br/&gt;
This is a pcrecpp internal bug, and a fix should be upstreamed.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/vmg/pcre/blob/master/pcrecpp.cc#L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/vmg/pcre/blob/master/pcrecpp.cc#L86&lt;/a&gt;&lt;/p&gt;

&lt;p/&gt;
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					&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;static&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; RE_Options default_options;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;referring to this in a static initializer is an init-order fiasco trigger.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1347381">SERVER-48116</key>
            <summary>init-order bug inside pcrecpp</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="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 May 2020 22:12:18 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:22 +0000</updated>
                            <resolved>Tue, 19 May 2020 22:37:48 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3096284" author="xgen-internal-githook" created="Tue, 19 May 2020 21:48:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48116&quot; title=&quot;init-order bug inside pcrecpp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48116&quot;&gt;&lt;del&gt;SERVER-48116&lt;/del&gt;&lt;/a&gt; fix init-order bug in pcrecpp::RE::Init&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e25d6c9c19e1897497ef07fcbb656bd4c17be349&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e25d6c9c19e1897497ef07fcbb656bd4c17be349&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3095869" author="billy.donahue" created="Tue, 19 May 2020 19:19:32 +0000"  >&lt;p&gt;CR &lt;a href=&quot;https://mongodbcr.appspot.com/589400001&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/589400001&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3085367" author="billy.donahue" created="Thu, 14 May 2020 08:01:29 +0000"  >&lt;p&gt;reopening to pursue better fix suggested by upstream bugzilla response.&lt;/p&gt;</comment>
                            <comment id="3085161" author="billy.donahue" created="Thu, 14 May 2020 02:32:18 +0000"  >&lt;p&gt;Actually upstream suggested a simpler fix. The RE_Options is just three ints, initialized to zero.&lt;br/&gt;
There&apos;s no reason at all to have a static instance of it. Will re-fix.&lt;/p&gt;</comment>
                            <comment id="3084610" author="billy.donahue" created="Wed, 13 May 2020 20:26:56 +0000"  >&lt;p&gt;Filed an upstream bug report  &lt;a href=&quot;https://bugs.exim.org/show_bug.cgi?id=2575&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://bugs.exim.org/show_bug.cgi?id=2575&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3084566" author="billy.donahue" created="Wed, 13 May 2020 20:01:25 +0000"  >&lt;p&gt;It&apos;s not showing up here for some reason, but the backport to 4.4 is:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a585cd2b6655af2542cdd153c4e9852d270b497d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a585cd2b6655af2542cdd153c4e9852d270b497d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3082323" author="xgen-internal-githook" created="Wed, 13 May 2020 00:00:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48116&quot; title=&quot;init-order bug inside pcrecpp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48116&quot;&gt;&lt;del&gt;SERVER-48116&lt;/del&gt;&lt;/a&gt; fix init-order bug in pcrecpp::RE::Init&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cb3f49285f8a5663244f94d89e56c2f28f7ae685&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cb3f49285f8a5663244f94d89e56c2f28f7ae685&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3079810" author="billy.donahue" created="Mon, 11 May 2020 22:51:44 +0000"  >&lt;p&gt;CR &lt;a href=&quot;https://mongodbcr.appspot.com/606070016/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/606070016/&lt;/a&gt;&lt;/p&gt;</comment>
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