For .net 5 preview1, the CoreFX symbols are missing for IL symbols.

[yunwei00q]

Affected Build: Master/29827.154 (16.6.0 preview 1.0) + CLI/SDK:5.0.100-preview.1.20125.9

Steps to reproduce
Testing on Windows with VS -

1. Goto Tools -> options -> Debugging
   Under General
   a. Uncheck 'Enable Just My Code'
   b. Check 'Suppress JIT optimization on module load (Managed only)'
   Under Symbols
   a. Check 'Microsoft Symbol Servers'

2. Create a new ASP.NET Razor project by doing
   mkdir razor
   cd razor
   dotnet new razor

3. Double click on the ‘Startup.cs’ file in the ‘Explorer’ pane to bring up that source code.

4. Add the following line to the Startup.cs file at the beginning of the ‘Configure’ method (at the bottom of the file). When using VS, you can add this line of code on Program.cs file

   Console.WriteLine("x " + 3);

5. Place a breakpoint on that line (F9).

6. Run the application until it hit that breakpoint (F5). It will load symbols from the Microsoft symbol server, and may take a few seconds to hit the breakpoint. You should see 20-30 lines of ‘Loaded XXX Symbols loaded’.

7. Step into the concatination method (F11). Select 'Download Source and Continue Debugging' from the popup
   This tests CoreCLR symbols AT THIS POINT IT SHOULD SHOW YOU THE SOURCE CODE FOR Concat().

8. Step out of Concat (Shift F11). Then step into the WriteLine method(F11). You may see the pop up as above, select the first option from it.
   This tests CoreFX symbols AT THIS POINT IT SHOULD SHOW YOU THE SOURCE CODE FOR Console.WriteLine().

Expected result:

CoreFX symbols are displayed in step8.

Actual result:

CoreFX symbols are missing in step8.

Dotnet –info:

.NET Core SDK (reflecting any global.json):
 Version:   5.0.100-preview.1.20125.9
 Commit:    12e88ed2e5

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.18362
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.100-preview.1.20125.9\

Host (useful for support):
  Version: 5.0.0-preview.1.20120.5
  Commit:  3c523a6a7a

.NET Core SDKs installed:
  3.1.200-preview-014977 [C:\Program Files\dotnet\sdk]
  5.0.100-preview.1.20125.9 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0-preview.1.20124.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0-preview.1.20120.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.0-preview.1.20122.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

[danmoseley]

@markwilkie didn't we add built-in validation that packages contained symbols (same as we added validation for symbols containing sourcelink)?

[danmoseley]

Actually, re-reading it sounds like symbols resolved but did not point to sources - sounds like sourcelink perhaps.

[markwilkie]

Any insight @tmat ?

[tmat]

I don't know what the current status of Source Link validation is. I think it was disabled at some point.
@JohnTortugo

[JohnTortugo]

The SourceLink validation has a toggle parameter to enable/disable it. Currently it is disabled for dotnet/runtime and dotnet/corefx@3.1

I think we missed re-enabling it when this issue was closed: #30551

[danmoseley]

Ouch. Maybe we need a validation step for the validation step ☹️

@ericstj not sure when @safern is back, or maybe @Anipik could look? We should fix for Preview 2

[danmoseley]

I also see enableSymbolValidation: false on the line above....

[JohnTortugo]

The symbol validation should be kept disabled. We were having some issues with that validation and decided to implement it as part of the release automation process: dotnet/arcade#3735

[JohnTortugo]

I created a copy of the master branch and ran a build with SourceLink validation enabled. Some packages are failing the validation. Here are the results:

https://dnceng.visualstudio.com/internal/_build/results?buildId=545906&view=logs&j=a0031d5e-23bf-56e4-50ed-887ec07ba0df&t=dbd0eeef-38fc-5d8d-697e-bbcba6ebbed3&l=30

[ericstj]

It looks like the commit hash used by the build doesn't exist in github: 2159123572fba25bc26b16baae8719c6432da2fa.