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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[CXX-2511] All arm64 and ppc64le tasks are failing now</title>
                <link>https://jira.mongodb.org/browse/CXX-2511</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>&lt;p&gt;Inspecting the waterfall of the cxx-driver project I noticed that starting with commit &lt;tt&gt;1afd5102fd63322fa448f490d5f0dbaee78374bb&lt;/tt&gt; on May 6th all the tasks on arm64 and ppc64le build variants failed.  The preceding commit which had executed the same tasks, &lt;tt&gt;ab8091ec66cc765ec1117b9cb05978771242b8f7&lt;/tt&gt;, on May 5th had all of them pass.  I did some comparisons between the Evergreen logs of the &lt;tt&gt;1afd5102fd63322fa448f490d5f0dbaee78374bb&lt;/tt&gt; build and the &lt;tt&gt;ab8091ec66cc765ec1117b9cb05978771242b8f7&lt;/tt&gt; build.  There did not appear to be any differences to which the failure could be attributed.  After that, I restarted two of the tasks which had completed successfully for the build of commit &lt;tt&gt;ab8091ec66cc765ec1117b9cb05978771242b8f7&lt;/tt&gt; and they both failed.  This makes it seem very likely that some external dependency or environmental factor has changed in a way as to trigger this failure.  However, a review of the &lt;tt&gt;drivers-evergreen-tools.git&lt;/tt&gt; history did not reveal any recent changes that might be suspect.&lt;/p&gt;

&lt;p&gt;Comparing the output of the Evergreen tasks for the successful executions and failing executions, it seems that the failures are associated with the &lt;tt&gt;estimatedDocumentCount&lt;/tt&gt; unified spec test.  The successful tasks only ran the subtests that were described as &quot;on less than 4.9.0&quot;, while the failing tasks also attempted the subtests described as &quot;on 4.9.0 or greater&quot;.  The strange thing is that the tasks in question all run against either server 5.0 or latest.  It seems effectively impossible for this failure to manifest in this way.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2045417">CXX-2511</key>
            <summary>All arm64 and ppc64le tasks are failing now</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="roberto.sanchez@mongodb.com">Roberto Sanchez</reporter>
                        <labels>
                            <label>failing-on-waterfall</label>
                    </labels>
                <created>Thu, 12 May 2022 02:18:17 +0000</created>
                <updated>Wed, 8 Feb 2023 19:16:53 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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