aspnetcore: System.AccessViolationException: Attempted to read or write protected memory.

Repro steps:

  • Install .NET 6 Preview 5 (6.0.100-preview.5.21268.9)
  • dotnet dev-certs https --trust
  • dotnet new blazorserver -o BlazorApp
  • cd BlazorApp
  • dotnet watch
  • Edit _Host.cshtml to add some HTML markup, and save the file

Expected result:

  • Markup changes show up in the browser

Actual result:

  • dotnet watch detects the file change, but the markup changes do not show up in the browser
  • Manually refreshing the browser at this point causes the following exception:
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at BlazorApp1.Pages.Pages__Host+<<ExecuteAsync>b__14_0#1>d.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.__Canon ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.__Canon ByRef)
   at BlazorApp1.Pages.Pages__Host.<ExecuteAsync>b__14_0#1()
   at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext+<SetOutputContentAsync>d__32.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext+<SetOutputContentAsync>d__32, Microsoft.AspNetCore.Razor.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<SetOutputContentAsync>d__32 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext+<SetOutputContentAsync>d__32, Microsoft.AspNetCore.Razor.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<SetOutputContentAsync>d__32 ByRef)
   at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext.SetOutputContentAsync()
   at BlazorApp1.Pages.Pages__Host+<ExecuteAsync>d__14.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.__Canon ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.__Canon ByRef)
   at BlazorApp1.Pages.Pages__Host.ExecuteAsync()
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.RazorPageAdapter.ExecuteAsync()
   at Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderPageCoreAsync>d__20.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderPageCoreAsync>d__20, Microsoft.AspNetCore.Mvc.Razor, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<RenderPageCoreAsync>d__20 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderPageCoreAsync>d__20, Microsoft.AspNetCore.Mvc.Razor, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<RenderPageCoreAsync>d__20 ByRef)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(Microsoft.AspNetCore.Mvc.Razor.IRazorPage, Microsoft.AspNetCore.Mvc.Rendering.ViewContext)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderPageAsync>d__19.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderPageAsync>d__19, 
Microsoft.AspNetCore.Mvc.Razor, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<RenderPageAsync>d__19 ByRef)    
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Start[[Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderPageAsync>d__19, Microsoft.AspNetCore.Mvc.Razor, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<RenderPageAsync>d__19 ByRef)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(Microsoft.AspNetCore.Mvc.Razor.IRazorPage, Microsoft.AspNetCore.Mvc.Rendering.ViewContext, Boolean)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderAsync>d__18.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderAsync>d__18, Microsoft.AspNetCore.Mvc.Razor, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<RenderAsync>d__18 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderAsync>d__18, Microsoft.AspNetCore.Mvc.Razor, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<RenderAsync>d__18 ByRef)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(Microsoft.AspNetCore.Mvc.Rendering.ViewContext)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor+<ExecuteAsync>d__22.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor+<ExecuteAsync>d__22, Microsoft.AspNetCore.Mvc.ViewFeatures, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ExecuteAsync>d__22 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor+<ExecuteAsync>d__22, Microsoft.AspNetCore.Mvc.ViewFeatures, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ExecuteAsync>d__22 ByRef)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(Microsoft.AspNetCore.Mvc.Rendering.ViewContext, System.String, 
System.Nullable`1<Int32>)
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageResultExecutor.ExecuteAsync(Microsoft.AspNetCore.Mvc.RazorPages.PageContext, Microsoft.AspNetCore.Mvc.RazorPages.PageResult)
   at Microsoft.AspNetCore.Mvc.RazorPages.PageResult.ExecuteResultAsync(Microsoft.AspNetCore.Mvc.ActionContext)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultAsync(Microsoft.AspNetCore.Mvc.IActionResult)
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeResultAsync(Microsoft.AspNetCore.Mvc.IActionResult) 
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](State ByRef, Scope ByRef, System.Object ByRef, Boolean ByRef)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeNextResultFilterAsync[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](State ByRef, Scope ByRef, System.Object ByRef, Boolean ByRef)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State ByRef, Scope ByRef, System.Object ByRef, Boolean ByRef)     
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State ByRef, Scope ByRef, System.Object ByRef, Boolean ByRef)     
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageRequestDelegateFactory+<>c__DisplayClass12_0.<CreateRequestDelegate>b__0(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.HttpsPolicy.HttpsRedirectionMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+<Invoke>d__9.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+<Invoke>d__9, Microsoft.AspNetCore.Diagnostics, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__9 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+<Invoke>d__9, Microsoft.AspNetCore.Diagnostics, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__9 ByRef)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware+<InvokeAsync>d__4.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware+<InvokeAsync>d__4, Microsoft.AspNetCore.Watch.BrowserRefresh, Version=6.0.100.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<InvokeAsync>d__4 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware+<InvokeAsync>d__4, Microsoft.AspNetCore.Watch.BrowserRefresh, Version=6.0.100.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<InvokeAsync>d__4 ByRef)
   at Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware.InvokeAsync(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3, Microsoft.AspNetCore.Http.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__3 ByRef)   
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3, Microsoft.AspNetCore.Http.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__3 ByRef)   
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3, Microsoft.AspNetCore.Http.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__3 ByRef)   
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3, Microsoft.AspNetCore.Http.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__3 ByRef)   
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3, Microsoft.AspNetCore.Http.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__3 ByRef)   
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3, Microsoft.AspNetCore.Http.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__3 ByRef)   
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Builder.Extensions.MapMiddleware+<Invoke>d__3, Microsoft.AspNetCore.Http.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__3 ByRef)   
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Hosting.HostingApplication.ProcessRequestAsync(Context)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequests>d__223`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequests>d__223`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequests>d__223`1<System.__Canon> ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequests>d__223`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequests>d__223`1<System.__Canon> ByRef)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.AspNetCore.Hosting.Server.IHttpApplication`1<System.__Canon>)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequestsAsync>d__222`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequestsAsync>d__222`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequestsAsync>d__222`1<System.__Canon> ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequestsAsync>d__222`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequestsAsync>d__222`1<System.__Canon> ByRef)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequestsAsync[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.AspNetCore.Hosting.Server.IHttpApplication`1<System.__Canon>)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http2.Http2Stream`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()
   at System.Threading.Thread.StartCallback()

About this issue

  • Original URL
  • State: closed
  • Created 3 years ago
  • Comments: 17 (16 by maintainers)

Most upvoted comments

Yup, not doing the ALC fixes the issue. I’ll transfer the issue back to AspNetCore to track fixing.

FYI @vitek-karas - yet another thing that would have gone poorly if the implementation for restart used an ALC.

+1
pranavkm on Jun 2, 2021

Oh fun. I wonder if this is related to the preview5 change to support hot restart. The assemblies are loaded in to a unloadable load context. Let me see if turning it off (or removing it as we currently plan to do) fixes it

+1
pranavkm on Jun 2, 2021

@pranavkm Not use collectible assemblies in Razor?

+1
tmat on Jun 2, 2021

FYI @tmat / @davidwengier. In case any of this rings a bell or you have suggestions on more tactical ways to handle this.

+1
pranavkm on Jun 2, 2021
Read more comments on GitHub
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