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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-84759] TSAN may fail to restore stack and thus fail to match against WT suppressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-84759</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It appears that there are some cases where TSAN can fail to restore a stack and thus that non-collected stack cannot be matched against our TSAN suppressions, in particular for the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5cc482778566323919d339bf2c8da533f38be782/etc/tsan.suppressions#L8-L22&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WT suppressions&lt;/a&gt;. We should figure out if we can ensure the stack is always restored successfully.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2543258">SERVER-84759</key>
            <summary>TSAN may fail to restore stack and thus fail to match against WT suppressions</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="alex.neben@mongodb.com">Alex Neben</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Jan 2024 14:41:50 +0000</created>
                <updated>Wed, 17 Jan 2024 19:56:31 +0000</updated>
                            <resolved>Wed, 17 Jan 2024 17:38:27 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="6018669" author="xgen-internal-githook" created="Wed, 17 Jan 2024 19:56:31 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Alexander Neben&apos;, &apos;email&apos;: &apos;alex.neben@mongodb.com&apos;, &apos;username&apos;: &apos;IamXander&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84759&quot; title=&quot;TSAN may fail to restore stack and thus fail to match against WT suppressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84759&quot;&gt;&lt;del&gt;SERVER-84759&lt;/del&gt;&lt;/a&gt; Changed the TSAN config options to increase history_size (#18045)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: baff19f7e72b6c7ce745385f6fc9f330a5bb24bc&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cce887135a3023cdb637e0a5d3501a4fa0b8a008&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cce887135a3023cdb637e0a5d3501a4fa0b8a008&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="6003968" author="max.hirschhorn@10gen.com" created="Thu, 11 Jan 2024 15:06:17 +0000"  >&lt;p&gt;I&apos;d be curious if we could get a complete stack by adjusting the &lt;tt&gt;history&amp;#95;size&lt;/tt&gt; option:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;If you intermittently see race reports where one stack is missing with a &lt;tt&gt;failed to restore the stack&lt;/tt&gt; message, this can indicate that a suppression is partially covering the race you are seeing.&lt;/p&gt;

&lt;p&gt;Any race where only one of the two stacks is matched by a runtime suppression will show up if that particular stack fails to symbolize for some reason. The usual solution is to search the suppressions for potential candidates and disable them temporarily to check if your race report now becomes mostly consistent.&lt;/p&gt;

&lt;p&gt;However, there are other reasons for broken TSan stacks, in particular if they are not intermittent. See also the &lt;tt&gt;history&amp;#95;size&lt;/tt&gt; parameter in the &lt;a href=&quot;https://github.com/google/sanitizers/wiki/ThreadSanitizerFlags&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;TSan flags&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://firefox-source-docs.mozilla.org/tools/sanitizer/tsan.html#intermittent-broken-stacks&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://firefox-source-docs.mozilla.org/tools/sanitizer/tsan.html#intermittent-broken-stacks&lt;/a&gt;&lt;/p&gt;&lt;/blockquote&gt;</comment>
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