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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31271] don&apos;t use nspr allocator for js threads for better ASAN</title>
                <link>https://jira.mongodb.org/browse/SERVER-31271</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;js threads can be freed in different threads than where they were created, and this breaks our ASAN-specific pointer tracker. So, if we just use the regular allocator for the threads, as opposed to the nspr allocator, then we won&apos;t try to track them.&lt;/p&gt;</description>
                <environment></environment>
        <key id="433204">SERVER-31271</key>
            <summary>don&apos;t use nspr allocator for js threads for better ASAN</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="gabriel.russell@mongodb.com">Gabriel Russell</assignee>
                                    <reporter username="gabriel.russell@mongodb.com">Gabriel Russell</reporter>
                        <labels>
                    </labels>
                <created>Tue, 26 Sep 2017 19:47:08 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:19 +0000</updated>
                            <resolved>Fri, 29 Sep 2017 21:43:21 +0000</resolved>
                                                    <fixVersion>3.4.10</fixVersion>
                    <fixVersion>3.6.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1691853" author="xgen-internal-githook" created="Fri, 6 Oct 2017 19:22:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;gabriel.russell@mongodb.com&apos;, &apos;name&apos;: &apos;Gabriel Russell&apos;, &apos;username&apos;: &apos;gabrielrussell&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31271&quot; title=&quot;don&amp;#39;t use nspr allocator for js threads for better ASAN&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31271&quot;&gt;&lt;del&gt;SERVER-31271&lt;/del&gt;&lt;/a&gt; don&apos;t use nspr allocator for js threads for better ASAN&lt;/p&gt;

&lt;p&gt;We can&apos;t use the nspr allocator to allocate threads in PR_CreateThread, because under asan&lt;br/&gt;
instrument the allocator so that asan can track the pointers correctly. This instrumentation&lt;br/&gt;
requires that pointers be deleted in the same thread that they were allocated in.&lt;br/&gt;
The threads created in PR_CreateThread are not always freed in the same thread&lt;br/&gt;
that they were created in. So, we use the standard allocator here.&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d1105687533de0db72f2ceba0cd5f2612145c956&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d1105687533de0db72f2ceba0cd5f2612145c956&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1685708" author="xgen-internal-githook" created="Fri, 29 Sep 2017 21:40:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;gabriel.russell@mongodb.com&apos;, &apos;name&apos;: &apos;Gabriel Russell&apos;, &apos;username&apos;: &apos;gabrielrussell&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31271&quot; title=&quot;don&amp;#39;t use nspr allocator for js threads for better ASAN&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31271&quot;&gt;&lt;del&gt;SERVER-31271&lt;/del&gt;&lt;/a&gt; don&apos;t use nspr allocator for js threads for better ASAN&lt;/p&gt;

&lt;p&gt;We can&apos;t use the nspr allocator to allocate threads in PR_CreateThread, because under asan&lt;br/&gt;
instrument the allocator so that asan can track the pointers correctly. This instrumentation&lt;br/&gt;
requires that pointers be deleted in the same thread that they were allocated in.&lt;br/&gt;
The threads created in PR_CreateThread are not always freed in the same thread&lt;br/&gt;
that they were created in. So, we use the standard allocator here.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/496835b0e7b0a16d423d412c4622479a659c0d1d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/496835b0e7b0a16d423d412c4622479a659c0d1d&lt;/a&gt;&lt;/p&gt;</comment>
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