Test failure: System.Net.NetworkInformation.Tests.NetworkInterfaceBasicTest/BasicTest_AccessInstanceProperties_NoExceptions_Linux

Opened on behalf of @jiangzeng

The test System.Net.NetworkInformation.Tests.NetworkInterfaceBasicTest/BasicTest_AccessInstanceProperties_NoExceptions_Linux has failed.

Assert.InRange() Failure\r
Range:  (0 - 9223372036854775807)\r
Actual: -1

Stack Trace:

   at System.Net.NetworkInformation.Tests.NetworkInterfaceBasicTest.BasicTest_AccessInstanceProperties_NoExceptions_Linux()

Failing configurations:

• Fedora.23.Amd64
  • AnyCPU-Debug
  • AnyCPU-Release

[mellinoe]

@ericeil I'm seeing this in some Ubuntu 16.10 runs as well. I'm pretty sure that the only way this could happen is if the actual statistics file from the system (/sys/class/net//speed) actually contains "-1" instead of a real speed value. I think we should just return null from the parsing routine in that case; it already returns null for other invalid values / IO errors.

[ViktorHofer]

Failing constantly again. Reopening.

System.Net.NetworkInformation.Tests.NetworkInterfaceBasicTest.BasicTest_AccessInstanceProperties_NoExceptions_Linux

netcoreapp5.0-Linux-Release-x64-Mono_release-Ubuntu.1804.Amd64.Open
netcoreapp5.0-Linux-Release-x64-Mono_release-RedHat.7.Amd64.Open
netcoreapp5.0-Linux-Release-x64-CoreCLR_checked-Ubuntu.1804.Amd64.Open
netcoreapp5.0-Linux-Release-x64-CoreCLR_release-Ubuntu.1804.Amd64.Open
netcoreapp5.0-Linux-Release-x64-CoreCLR_release-RedHat.7.Amd64.Open

Assert.InRange() Failure\r\nRange: (-1 - 9223372036854775807)\r\nActual: -1539607552
 at System.Net.NetworkInformation.Tests.NetworkInterfaceBasicTest.BasicTest_AccessInstanceProperties_NoExceptions_Linux() in /_/src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceBasicTest.cs:line 75
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) in /_/src/mono/netcore/System.Private.CoreLib/src/System/Reflection/RuntimeMethodInfo.cs:line 339

[ManickaP]

It fails on Assert.InRange(nic.Speed, -1, long.MaxValue); . I think it might be the conversion to int here: https://github.com/dotnet/runtime/blob/master/src/libraries/Native/Unix/System.Native/pal_interfaceaddresses.c#L376, because the function itself returns uint: https://elixir.bootlin.com/linux/v5.5.3/source/include/uapi/linux/ethtool.h#L123.
@wfurt Unless you immediately know what the problem is and the fix would literally take you just few minutes, I'll look into it. Seems like fun investigation 😄

[CoffeeFlux]

Hit on #2098

[akoeplinger]

Another tracking issue for this: #32179

[jaredpar]

Not sure why my GitHub search didn't turn up this issue. Closing #32179 and using this as the primary. Will bring the test failure table over here.