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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>
    </build-info>


<item>
            <title>[CSHARP-3515] Sporadic tests failures: TestGuidRefId</title>
                <link>https://jira.mongodb.org/browse/CSHARP-3515</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;&lt;tt&gt;MongoDB.Driver.Tests.MongoDBRefTests.TestGuidRefId&lt;/tt&gt; fails occasionally.&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;
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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;   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;[2021/03/30 02:09:17.782] [xUnit.net 00:03:25.16]     MongoDB.Driver.Tests.MongoDBRefTests.TestGuidRefId [FAIL]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;[2021/03/30 02:09:17.788]   X MongoDB.Driver.Tests.MongoDBRefTests.TestGuidRefId [1ms]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;[2021/03/30 02:09:17.788]   Error Message:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;[2021/03/30 02:09:17.788]    MongoDB.Bson.BsonSerializationException : Cannot serialize BsonBinaryData with GuidRepresentation Unspecified to destination with GuidRepresentation CSharpLegacy.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task_log_raw/dot_net_driver_unsecure_tests_macOS__version~4.4_os~macos_1014_topology~sharded_cluster_auth~noauth_ssl~nossl_test_netstandard20_patch_b0614b47905437dfae30e64b331cb4c5fcc3bc7a_606284d92a60ed5c62e7451f_21_03_30_01_54_33/0?type=T#L1952&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Example1&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://evergreen.mongodb.com/task_log_raw/dot_net_driver_tests_zlib_compression__version~4.4_os~windows_64_topology~standalone_auth~noauth_ssl~nossl_compressor~zlib_test_netstandard15_patch_b0614b47905437dfae30e64b331cb4c5fcc3bc7a_606284d92a60ed5c62e7451f_21_03_30_01_54_33/0?type=T#L3529&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Example2&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://evergreen.mongodb.com/task_log_raw/dot_net_driver_unsecure_tests_posix__version~3.4_os~ubuntu_1804_topology~sharded_cluster_auth~noauth_ssl~nossl_test_netstandard20_patch_b0614b47905437dfae30e64b331cb4c5fcc3bc7a_606284d92a60ed5c62e7451f_21_03_30_01_54_33/0?type=T#L2443&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Example3&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1666153">CSHARP-3515</key>
            <summary>Sporadic tests failures: TestGuidRefId</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="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="mikalai.mazurenka@mongodb.com">Mikalai Mazurenka</reporter>
                        <labels>
                    </labels>
                <created>Wed, 31 Mar 2021 14:16:05 +0000</created>
                <updated>Sat, 28 Oct 2023 11:47:51 +0000</updated>
                            <resolved>Fri, 16 Apr 2021 15:16:28 +0000</resolved>
                                                    <fixVersion>2.13.0</fixVersion>
                                    <component>BSON</component>
                    <component>Testing</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3722461" author="xgen-internal-githook" created="Fri, 16 Apr 2021 15:15:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;rstam&apos;, &apos;email&apos;: &apos;robert@robertstam.org&apos;, &apos;username&apos;: &apos;rstam&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-3515&quot; title=&quot;Sporadic tests failures: TestGuidRefId&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-3515&quot;&gt;&lt;del&gt;CSHARP-3515&lt;/del&gt;&lt;/a&gt;: Sporadic tests failures: TestGuidRefId&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/ec00a97e2a60e2867c85ff870083bf79a2967fbe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/ec00a97e2a60e2867c85ff870083bf79a2967fbe&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3705879" author="rstam" created="Wed, 7 Apr 2021 16:48:20 +0000"  >&lt;p&gt;I have not been able to reproduce this, but the theory is that one of the following global state properties has an unexpected value when the test is run:&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;
				&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;   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;BsonBinaryReaderSettings.Defaults&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;BsonBinaryWriterSettings.Defaults&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;BsonDocumentReaderSettings.Defaults&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;BsonDocumentWriterSettings.Defaults&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;JsonReaderSettings.Defaults&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&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-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;JsonWriterSettings.Defaults &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;These static properties were defined a very long time ago, and are lazily initialized. When initialized they capture some current values from BsonDefaults (which is also global state).&lt;/p&gt;

&lt;p&gt;Today we know that we should avoid global state, but this global state exists for historical reasons.&lt;/p&gt;

&lt;p&gt;The reason this global state might have unexpected values is because xUnit runs tests in random order, so depending on the order the tests were run in this global state might have different values.&lt;/p&gt;

&lt;p&gt;The proposed fix for this test is to ensure that this global state is saved at the beginning of the test, is set to a well defined state before the test is run, and restored to the prior state at the end of the test. This is accomplished by adding these values to the existing `GuidMode` class.&lt;/p&gt;

&lt;p&gt;This fix is general and can apply to any other test that also depends on this global state.&lt;/p&gt;</comment>
                    </comments>
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