Kestrel BadImageFormatException

Steps to reproduce

Create a new webAPI from the command line dotnet new webapi

Run from the console dot new run

Visit the http or https URL for example: http://localhost:16767/api/values

Expected behavior

Expect to see the Json formatted response of the basic GET, value1 and value 2

Actual behavior

Following is desplayed in console: fail: Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv[0] UvAllocCb System.BadImageFormatException: Bad IL format. at System.Buffers.OwnedMemory1.Pin(Int32 byteOffset) at System.Memory1.Retain(Boolean pin) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.LibuvConnection.OnAlloc(UvStreamHandle handle, Int32 suggestedSize) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.LibuvConnection.<>c.<.cctor>b__24_1(UvStreamHandle handle, Int32 suggestedsize, Object state) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.UvStreamHandle.UvAllocCb(IntPtr handle, Int32 suggested_size, uv_buf_t& buf)

Unhandled Exception: System.BadImageFormatException: Bad IL format. at System.Buffers.OwnedMemory1.Pin(Int32 byteOffset) at System.Memory1.Retain(Boolean pin) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.LibuvConnection.OnAlloc(UvStreamHandle handle, Int32 suggestedSize) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.LibuvConnection.<>c.<.cctor>b__24_1(UvStreamHandle handle, Int32 suggestedsize, Object state) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.UvStreamHandle.UvAllocCb(IntPtr handle, Int32 suggested_size, uv_buf_t& buf) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.UvStreamHandle.<>c.<.cctor>b__20_1(IntPtr handle, Int32 suggested_size, uv_buf_t& buf) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.LibuvFunctions.NativeMethods.uv_run(UvLoopHandle handle, Int32 mode) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking.LibuvFunctions.run(UvLoopHandle handle, Int32 mode) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.LibuvThread.ThreadStart(Object parameter) — End of stack trace from previous location where exception was thrown — at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.LibuvThread.StopAsync(TimeSpan timeout) at Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.LibuvTransport.StopAsync() at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.StopAsync(CancellationToken cancellationToken) at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.StopAsync(CancellationToken cancellationToken) at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.Dispose() at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.Dispose() at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.Dispose() at Microsoft.Extensions.DependencyInjection.ServiceProvider.Dispose() at Microsoft.AspNetCore.Hosting.Internal.WebHost.Dispose() at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token, String shutdownMessage) at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token) at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host) at myApi.Program.Main(String[] args) in d:\dev\myApi\Program.cs:line 17

Environment data

dotnet --info output: .NET Command Line Tools (2.1.300-preview2-008044)

Product Information: Version: 2.1.300-preview2-008044 Commit SHA-1 hash: c22f7e29a0

Runtime Environment: OS Name: Windows OS Version: 10.0.16299 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\2.1.300-preview2-008044\

Microsoft .NET Core Shared Framework Host

Version : 2.1.0-preview2-26130-06 Build : b13a0d5c331f374afd35ded57b9a4b4ab128864c

[davidfowl]

The issue has been fixed in kestrel https://github.com/aspnet/KestrelHttpServer/issues/2271 but it hasn’t propagated through all the build layers as yet.

[muratg]

@livarcocc closing this as this is an ASP.NET issue. 😃