Test failure CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

Run: [runtime-libraries-coreclr outerloop 20220215.3](https://dev.azure.com/dnceng/public/_build/results?buildId=1613576&view=ms.vss-test-web.build-test-results-tab&runId=44920850&resultId=101614&paneView=debug)

Failed test:
```
net7.0-Linux-Release-arm-CoreCLR_release-(Debian.10.Arm32.Open)Ubuntu.1804.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-10-helix-arm32v7-20210304164340-6616c63
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-arm-CoreCLR_release-(Debian.11.Arm32.Open)Ubuntu.1804.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-11-helix-arm32v7-20210304164347-5a7c380
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(openSUSE.15.2.Amd64.Open)ubuntu.1604.amd64.open@mcr.microsoft.com/dotnet-buildtools/prereqs:opensuse-15.2-helix-amd64-20211018152525-9cc02fe
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Mariner.1.0.Amd64.Open)ubuntu.1604.amd64.open@mcr.microsoft.com/dotnet-buildtools/prereqs:cbl-mariner-1.0-helix-20210528192219-92bf620
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Centos.8.Amd64.Open)Ubuntu.1604.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:centos-8-helix-20201229003624-c1bf759
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Centos.7.Amd64.Open)Ubuntu.1604.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:centos-7-mlnet-helix-20210714125435-dde38af
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Ubuntu.2110.Amd64.Open)ubuntu.1604.amd64.open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-21.04-helix-amd64-20210922170909-34a2d72
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Fedora.34.Amd64.Open)ubuntu.1604.amd64.open@mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-34-helix-20210913123654-4f64125
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-SLES.15.Amd64.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Debian.11.Amd64.Open)Ubuntu.1804.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-11-helix-amd64-20210304164428-5a7c380
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-RedHat.7.Amd64.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Debian.10.Amd64.Open)Ubuntu.1804.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-10-helix-amd64-20210304164434-56c6673
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-Ubuntu.1804.Amd64.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Alpine.313.Amd64.Open)Ubuntu.1804.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.13-helix-amd64-20210910135845-8a6f4f3
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-x64-CoreCLR_release-(Alpine.314.Amd64.Open)Ubuntu.1804.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.14-helix-amd64-20210910135833-1848e19
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-arm64-CoreCLR_release-(Ubuntu.2110.Arm64.Open)Ubuntu.1804.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-21.10-helix-arm64v8-20211116135000-0f8d97e
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-Linux-Release-arm64-CoreCLR_release-(Ubuntu.1804.ArmArch.Open)Ubuntu.1804.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-helix-arm64v8-20210106155927-56c6673
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x64-CoreCLR_release-Windows.10.Amd64.ServerRS5.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x64-CoreCLR_release-Windows.81.Amd64.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x64-CoreCLR_release-Windows.10.Amd64.Server19H1.ES.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x64-CoreCLR_release-(Windows.Nano.1809.Amd64.Open)windows.10.amd64.serverrs5.open@mcr.microsoft.com/dotnet-buildtools/prereqs:nanoserver-1809-helix-amd64-08e8e40-20200107182504
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x64-CoreCLR_release-Windows.11.Amd64.ClientPre.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x64-CoreCLR_release-(Windows.Server.Core.1909.Amd64.Open)windows.10.amd64.server20h2.open@mcr.microsoft.com/dotnet-buildtools/prereqs:windowsservercore-2004-helix-amd64-20200904200251-272704c
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x86-CoreCLR_release-Windows.Amd64.Server2022.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x86-CoreCLR_release-Windows.10.Amd64.Server19H1.ES.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x86-CoreCLR_release-Windows.7.Amd64.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-windows-Release-x86-CoreCLR_release-Windows.10.Amd64.ServerRS5.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests

net7.0-OSX-Release-arm64-CoreCLR_release-OSX.1200.ARM64.Open
- CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests
```
**Error message:**
```
ReadBase64 Element with all valid value
System.Xml.XmlException: Root element is missing.
at System.Xml.XmlTextReaderImpl.Throw(Exception e) in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 2794
at System.Xml.XmlTextReaderImpl.ParseDocumentContent() in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 4190
at System.Xml.XmlTextReaderImpl.Read() in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 1238
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options) in //src/libraries/System.Private.Xml.Linq/src/System/Xml/Linq/XDocument.cs:line 423
at CoreXml.Test.XLinq.BridgeHelpers.GetReader(String strSource) in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Common/BridgeHelpers.cs:line 127
at CoreXml.Test.XLinq.XNodeReaderFunctionalTests.XNodeReaderTests.TCReadContentAsBase64.TestReadBase64_1() in //src/libraries/System.Private.Xml.Linq/tests/xNodeReader/ReadBase64.cs:line 110
at Microsoft.Test.ModuleCore.TestVariation.Execute() in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Test.ModuleCore/testvariation.cs:line 64
at Microsoft.Test.ModuleCore.TestCase.Execute() in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Test.ModuleCore/testcase.cs:line 84
ReadBase64 Element with all valid Num value
System.Xml.XmlException: Root element is missing.
at System.Xml.XmlTextReaderImpl.Throw(Exception e) in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 2794
at System.Xml.XmlTextReaderImpl.ParseDocumentContent() in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 4190
at System.Xml.XmlTextReaderImpl.Read() in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 1238
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options) in //src/libraries/System.Private.Xml.Linq/src/System/Xml/Linq/XDocument.cs:line 423
at CoreXml.Test.XLinq.BridgeHelpers.GetReader(String strSource) in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Common/BridgeHelpers.cs:line 127
at CoreXml.Test.XLinq.XNodeReaderFunctionalTests.XNodeReaderTests.TCReadContentAsBase64.TestReadBase64_2() in //src/libraries/System.Private.Xml.Linq/tests/xNodeReader/ReadBase64.cs:line 132
at Microsoft.Test.ModuleCore.TestVariation.Execute() in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Test.ModuleCore/testvariation.cs:line 64
at Microsoft.Test.ModuleCore.TestCase.Execute() in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Test.ModuleCore/testcase.cs:line 84
ReadBase64 Element with all valid Text value
System.Xml.XmlException: Root element is missing.
at System.Xml.XmlTextReaderImpl.Throw(Exception e) in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 2794
at System.Xml.XmlTextReaderImpl.ParseDocumentContent() in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 4190
at System.Xml.XmlTextReaderImpl.Read() in //src/libraries/System.Private.Xml/src/System/Xml/Core/XmlTextReaderImpl.cs:line 1238
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options) in //src/libraries/System.Private.Xml.Linq/src/System/Xml/Linq/XDocument.cs:line 423
at CoreXml.Test.XLinq.BridgeHelpers.GetReader(String strSource) in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Common/BridgeHelpers.cs:line 127
at CoreXml.Test.XLinq.XNodeReaderFunctionalTests.XNodeReaderTests.TCReadContentAsBase64.TestReadBase64_3() in //src/libraries/System.Private.Xml.Linq/tests/xNodeReader/ReadBase64.cs:line 154
at Microsoft.Test.ModuleCore.TestVariation.Execute() in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Test.ModuleCore/testvariation.cs:line 64
at Microsoft.Test.ModuleCore.TestCase.Execute() in //src/libraries/System.Private.Xml.Linq/tests/XDocument.Test.ModuleCore/testca


Stack trace
   at CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests() in /_/src/libraries/System.Private.Xml.Linq/tests/xNodeReader/FunctionalTests.cs:line 29
```

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Test failure CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests #65416

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Test failure CoreXml.Test.XLinq.XNodeReaderFunctionalTests.RunTests #65416

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