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Runtime hang after updating net48 project to .NET 8 SDK
Describe the bug
After attempting to update our net48-targeting application's builds from .NET SDK 7.0.404 to 8.0.101, we ran into previously valid application code consistently hanging in Release builds.
To Reproduce
MRE Github Repo: https://github.com/mthjones/net8sdk-hang-mre/tree/main
The change in behaviour is found in Case 3, and can be triggered with dotnet run -c Release -- 3, when changing the SDK version in global.json between 7.0.404 and 8.0.101.
The IL diff produced by the application on 7.0.404 and 8.0.101:
diff --git "a/C:\\Users\\mjones\\AppData\\Local\\Temp\\tmpC0BE.tmp" "b/C:\\Users\\mjones\\AppData\\Local\\Temp\\tmpC11D.tmp"
index da52341..b3a9ecd 100644
--- "a/C:\\Users\\mjones\\AppData\\Local\\Temp\\tmpC0BE.tmp"
+++ "b/C:\\Users\\mjones\\AppData\\Local\\Temp\\tmpC11D.tmp"
@@ -28,7 +28,10 @@
6D 72 65 00 00 ) // mre..
.custom instance void [mscorlib]System.Reflection.AssemblyConfigurationAttribute::.ctor(string) = ( 01 00 07 52 65 6C 65 61 73 65 00 00 ) // ...Release..
.custom instance void [mscorlib]System.Reflection.AssemblyFileVersionAttribute::.ctor(string) = ( 01 00 07 31 2E 30 2E 30 2E 30 00 00 ) // ...1.0.0.0..
- .custom instance void [mscorlib]System.Reflection.AssemblyInformationalVersionAttribute::.ctor(string) = ( 01 00 05 31 2E 30 2E 30 00 00 ) // ...1.0.0..
+ .custom instance void [mscorlib]System.Reflection.AssemblyInformationalVersionAttribute::.ctor(string) = ( 01 00 2E 31 2E 30 2E 30 2B 34 64 62 63 62 31 30 // ...1.0.0+4dbcb10
+ 36 36 64 66 36 31 34 34 62 30 63 35 37 34 63 38 // 66df6144b0c574c8
+ 31 34 36 36 63 65 66 62 31 62 62 32 62 64 66 63 // 1466cefb1bb2bdfc
+ 64 00 00 ) // d..
.custom instance void [mscorlib]System.Reflection.AssemblyProductAttribute::.ctor(string) = ( 01 00 10 6E 65 74 38 73 64 6B 2D 68 61 6E 67 2D // ...net8sdk-hang-
6D 72 65 00 00 ) // mre..
.custom instance void [mscorlib]System.Reflection.AssemblyTitleAttribute::.ctor(string) = ( 01 00 10 6E 65 74 38 73 64 6B 2D 68 61 6E 67 2D // ...net8sdk-hang-
@@ -37,13 +40,13 @@
.ver 1:0:0:0
}
.module 'net8sdk-hang-mre.exe'
-// MVID: {C4619B5E-BB80-47A9-8657-D99AE29EE9AC}
+// MVID: {40427478-C9F6-4E7B-9A13-01E75142BE01}
.imagebase 0x00400000
.file alignment 0x00000200
.stackreserve 0x00100000
.subsystem 0x0003 // WINDOWS_CUI
.corflags 0x00000001 // ILONLY
-// Image base: 0x06FD0000
+// Image base: 0x05200000
// =============== CLASS MEMBERS DECLARATION ===================
@@ -151,7 +154,7 @@
} // end of class net8sdk_hang_mre.Program
-.class interface public abstract auto ansi net8sdk_hang_mre.IFoo`1<T>
+.class interface public abstract auto ansi beforefieldinit net8sdk_hang_mre.IFoo`1<T>
{
.method public hidebysig newslot abstract virtual
instance bool DoSomething() cil managed
@@ -160,11 +163,11 @@
} // end of class net8sdk_hang_mre.IFoo`1
-.class interface public abstract auto ansi net8sdk_hang_mre.IBaseParams
+.class interface public abstract auto ansi beforefieldinit net8sdk_hang_mre.IBaseParams
{
} // end of class net8sdk_hang_mre.IBaseParams
-.class interface public abstract auto ansi net8sdk_hang_mre.IParams
+.class interface public abstract auto ansi beforefieldinit net8sdk_hang_mre.IParams
implements net8sdk_hang_mre.IBaseParams
{
} // end of class net8sdk_hang_mre.IParams
Exceptions (if any)
None.
Further technical details
`dotnet --info` output
.NET SDK:
Version: 8.0.101
Commit: 6eceda187b
Workload version: 8.0.100-manifests.69afb982
Runtime Environment:
OS Name: Windows
OS Version: 10.0.19044
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\8.0.101\
.NET workloads installed:
Workload version: 8.0.100-manifests.69afb982
There are no installed workloads to display.
Host:
Version: 8.0.1
Architecture: x64
Commit: bf5e279d92
.NET SDKs installed:
5.0.301 [C:\Program Files\dotnet\sdk]
6.0.301 [C:\Program Files\dotnet\sdk]
6.0.400 [C:\Program Files\dotnet\sdk]
7.0.404 [C:\Program Files\dotnet\sdk]
8.0.100 [C:\Program Files\dotnet\sdk]
8.0.101 [C:\Program Files\dotnet\sdk]
.NET runtimes installed:
Microsoft.AspNetCore.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Other architectures found:
arm64 [C:\Program Files\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\arm64\InstallLocation]
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]
Environment variables:
Not set
global.json file:
C:\Users\mjones\code\net8-beforefieldinit\global.json
Learn more:
https://aka.ms/dotnet/info
Download .NET:
https://aka.ms/dotnet/download
Looking a bit deeper into this - it seems like this results from the changes in https://github.com/dotnet/roslyn/pull/69850.
I built the MRE using SDK version 8.0.101 with dotnet build -c Release net8sdk-hang-mre\net8sdk-hang-mre.csproj and then dumped the IL from the executable with ildasm. I've created a gist with this .il file alongside a patch that removes the beforefieldinit flag from interfaces.
When reassembling the IL with ilasm, case 3 hangs indefinitely with the unpatched executable but runs without issue when patched and reassembled.
https://gist.github.com/Matthew-nop/85d4c11c6f66bbc5f2e1088f443e7939
Would it be possible to get an update? This is currently blocking net48-targetted applications from being updated to .NET8 SDK. Thank you!
