diff --git a/src/System.IO.FileSystem.DriveInfo/tests/DriveInfo.Unix.Tests.cs b/src/System.IO.FileSystem.DriveInfo/tests/DriveInfo.Unix.Tests.cs
index 8f16ccc81b9c..65b155e67991 100644
--- a/src/System.IO.FileSystem.DriveInfo/tests/DriveInfo.Unix.Tests.cs
+++ b/src/System.IO.FileSystem.DriveInfo/tests/DriveInfo.Unix.Tests.cs
@@ -60,6 +60,7 @@ public void PropertiesOfInvalidDrive()
             Assert.Equal(invalidDriveName, invalidDrive.VolumeLabel);   // VolumeLabel is equivalent to Name on Unix
         }
 
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/11570
         [PlatformSpecific(TestPlatforms.AnyUnix)]
         public void PropertiesOfValidDrive()
         {
diff --git a/src/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.Simple.cs b/src/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.Simple.cs
index fde032b1f336..2caac447d405 100644
--- a/src/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.Simple.cs
+++ b/src/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.Simple.cs
@@ -365,7 +365,7 @@ public async Task Windows_OperationsOnNamedServerWithDisposedClient()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/1011
+        [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)] // Unix implemented on sockets, where disposal information doesn't propagate
         public async Task Unix_OperationsOnNamedServerWithDisposedClient()
         {
diff --git a/src/System.Net.NetworkInformation/tests/FunctionalTests/IPInterfacePropertiesTest_Linux.cs b/src/System.Net.NetworkInformation/tests/FunctionalTests/IPInterfacePropertiesTest_Linux.cs
index b2aec957e2af..e40fd15d3ff6 100644
--- a/src/System.Net.NetworkInformation/tests/FunctionalTests/IPInterfacePropertiesTest_Linux.cs
+++ b/src/System.Net.NetworkInformation/tests/FunctionalTests/IPInterfacePropertiesTest_Linux.cs
@@ -20,7 +20,8 @@ public IPInterfacePropertiesTest_Linux()
             _log = TestLogging.GetInstance();
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         public void IPInfoTest_AccessAllProperties_NoErrors()
         {
             foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
@@ -102,7 +103,8 @@ public void IPInfoTest_AccessAllProperties_NoErrors()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         public void IPInfoTest_AccessAllIPv4Properties_NoErrors()
         {
             foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
@@ -125,7 +127,8 @@ public void IPInfoTest_AccessAllIPv4Properties_NoErrors()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         public void IPInfoTest_AccessAllIPv6Properties_NoErrors()
         {
             foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
@@ -150,7 +153,8 @@ public void IPInfoTest_AccessAllIPv6Properties_NoErrors()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [Trait("IPv6", "true")]
         public void IPv6ScopeId_AccessAllValues_Success()
         {
diff --git a/src/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceBasicTest.cs b/src/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceBasicTest.cs
index 4c43121085fc..cbe912e60a92 100644
--- a/src/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceBasicTest.cs
+++ b/src/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceBasicTest.cs
@@ -20,7 +20,8 @@ public NetworkInterfaceBasicTest()
             _log = TestLogging.GetInstance();
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         public void BasicTest_GetNetworkInterfaces_AtLeastOne()
         {
             Assert.NotEqual<int>(0, NetworkInterface.GetAllNetworkInterfaces().Length);
@@ -51,7 +52,8 @@ public void BasicTest_AccessInstanceProperties_NoExceptions()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [PlatformSpecific(TestPlatforms.Linux)]  // Some APIs are not supported on Linux
         public void BasicTest_AccessInstanceProperties_NoExceptions_Linux()
         {
@@ -109,7 +111,8 @@ public void BasicTest_AccessInstanceProperties_NoExceptions_Osx()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [Trait("IPv4", "true")]
         public void BasicTest_StaticLoopbackIndex_MatchesLoopbackNetworkInterface()
         {
@@ -131,7 +134,8 @@ public void BasicTest_StaticLoopbackIndex_MatchesLoopbackNetworkInterface()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [Trait("IPv4", "true")]
         public void BasicTest_StaticLoopbackIndex_ExceptionIfV4NotSupported()
         {
@@ -140,7 +144,8 @@ public void BasicTest_StaticLoopbackIndex_ExceptionIfV4NotSupported()
             _log.WriteLine("Loopback IPv4 index: " + NetworkInterface.LoopbackInterfaceIndex);
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [Trait("IPv6", "true")]
         public void BasicTest_StaticIPv6LoopbackIndex_MatchesLoopbackNetworkInterface()
         {
@@ -164,7 +169,8 @@ public void BasicTest_StaticIPv6LoopbackIndex_MatchesLoopbackNetworkInterface()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [Trait("IPv6", "true")]
         public void BasicTest_StaticIPv6LoopbackIndex_ExceptionIfV6NotSupported()
         {
@@ -196,7 +202,8 @@ public void BasicTest_GetIPInterfaceStatistics_Success()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [PlatformSpecific(TestPlatforms.Linux)]  // Some APIs are not supported on Linux
         public void BasicTest_GetIPInterfaceStatistics_Success_Linux()
         {
@@ -244,13 +251,16 @@ public void BasicTest_GetIPInterfaceStatistics_Success_OSX()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         public void BasicTest_GetIsNetworkAvailable_Success()
         {
             Assert.True(NetworkInterface.GetIsNetworkAvailable());
         }
 
-        [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [PlatformSpecific(~TestPlatforms.OSX)]
         [InlineData(false)]
         [InlineData(true)]
diff --git a/src/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceIPv4Statistics.cs b/src/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceIPv4Statistics.cs
index 2aa59259efad..e1264cb2f7a5 100644
--- a/src/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceIPv4Statistics.cs
+++ b/src/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceIPv4Statistics.cs
@@ -45,7 +45,8 @@ public void BasicTest_GetIPv4InterfaceStatistics_Success()
             }
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        // dotnet: /d/git/corefx/src/Native/Unix/Common/pal_safecrt.h:47: errno_t memcpy_s(void *, size_t, const void *, size_t): Assertion `sizeInBytes >= count' failed.
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/dotnet/corefx/issues/15513
         [PlatformSpecific(TestPlatforms.Linux)]  // Some APIs are not supported on Linux
         public void BasicTest_GetIPv4InterfaceStatistics_Success_Linux()
         {
diff --git a/src/System.Net.Sockets/tests/FunctionalTests/DualModeSocketTest.cs b/src/System.Net.Sockets/tests/FunctionalTests/DualModeSocketTest.cs
index bdf535feed40..7d137cf0130b 100644
--- a/src/System.Net.Sockets/tests/FunctionalTests/DualModeSocketTest.cs
+++ b/src/System.Net.Sockets/tests/FunctionalTests/DualModeSocketTest.cs
@@ -506,13 +506,13 @@ public void ConnectAsyncV6IPEndPointToV6Host_Success()
             DualModeConnectAsync_IPEndPointToHost_Helper(IPAddress.IPv6Loopback, IPAddress.IPv6Loopback, false);
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        [Fact]
         public void ConnectAsyncV4IPEndPointToV6Host_Fails()
         {
             DualModeConnectAsync_IPEndPointToHost_Fails_Helper(IPAddress.Loopback, IPAddress.IPv6Loopback);
         }
 
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        [Fact]
         public void ConnectAsyncV6IPEndPointToV4Host_Fails()
         {
             DualModeConnectAsync_IPEndPointToHost_Fails_Helper(IPAddress.IPv6Loopback, IPAddress.Loopback);
diff --git a/src/System.Net.Sockets/tests/FunctionalTests/SelectTest.cs b/src/System.Net.Sockets/tests/FunctionalTests/SelectTest.cs
index 9b263cafbed0..8a4a601c9b8e 100644
--- a/src/System.Net.Sockets/tests/FunctionalTests/SelectTest.cs
+++ b/src/System.Net.Sockets/tests/FunctionalTests/SelectTest.cs
@@ -146,7 +146,7 @@ public void Select_Read_OneReadyAtATime(int reads)
         }
 
         [PlatformSpecific(~TestPlatforms.OSX)] // typical OSX install has very low max open file descriptors value
-        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsSubsystemForLinux))] // https://github.com/Microsoft/BashOnWindows/issues/308
+        [Fact]
         public void Select_Error_OneReadyAtATime()
         {
             const int Errors = 90; // value larger than the internal value in SocketPal.Unix that swaps between stack and heap allocation
diff --git a/src/System.Net.Sockets/tests/FunctionalTests/SocketOptionNameTest.cs b/src/System.Net.Sockets/tests/FunctionalTests/SocketOptionNameTest.cs
index 93ba2809e080..70a027942fb2 100644
--- a/src/System.Net.Sockets/tests/FunctionalTests/SocketOptionNameTest.cs
+++ b/src/System.Net.Sockets/tests/FunctionalTests/SocketOptionNameTest.cs
@@ -117,11 +117,7 @@ private async Task MulticastInterface_Set_Helper(int interfaceIndex)
                 receiveSocket.ReceiveTimeout = 1000;
                 receiveSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(multicastAddress, interfaceIndex));
 
-                // https://github.com/Microsoft/BashOnWindows/issues/990
-                if (!PlatformDetection.IsWindowsSubsystemForLinux)
-                {
-                    sendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, IPAddress.HostToNetworkOrder(interfaceIndex));
-                }
+                sendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, IPAddress.HostToNetworkOrder(interfaceIndex));
 
                 var receiveBuffer = new byte[1024];
                 var receiveTask = receiveSocket.ReceiveAsync(new ArraySegment<byte>(receiveBuffer), SocketFlags.None);