Uncaught Error: The delegate target that is being invoked is no longer available. Please check if it has been prematurely GC'd. #55679

k-u-s · 2021-07-13T08:21:37Z

Describe the bug

As originally posted in dotnet/aspnetcore#32386 sometimes when loading/refreshing Blazor wsam site that uses signalr connection it fails with message from title. But I do not think it is resolved in net6. This error is somewhe inside
HubConnection.StartAsync(CancellationToken cancellationToken = default). Also wrom whar I observed this exception is not propageted. So if you have something like:

try{ await hc.StartAsync();}
catch{}
finally{}

catch and finally block are never called.

To Reproduce

Similar as in: dotnet/aspnetcore#32386

Exceptions (if any)

Further technical details

ASP.NET Core version: .NET6-previev5

Image is build using tools from

Digest: sha256:789b28fbee1c28b2c637e5b1dcbc54f93bbcd01db1481447dfaccb79f8bd3fae
Status: Downloaded newer image for mcr.microsoft.com/dotnet/sdk:6.0-bullseye-slim

And run inside:

mcr.microsoft.com/dotnet/runtime-deps:6.0-bullseye-slim
Digest: sha256:37068731bf9ae0789e1d28f8d75ac52c7ef4d88e7b81574caa7017ebc8fe0320
Status: Downloaded newer image for mcr.microsoft.com/dotnet/runtime-deps:6.0-bullseye-slim

Thanks for the additional details. Given that we haven't received any other similar feedback we're closing this issue as per your statement it's working correctly in .NET 6.

Originally posted by @mkArtakMSFT in dotnet/aspnetcore#32386 (comment)

BrennanConroy · 2021-07-13T15:19:11Z

@kg

kg · 2021-07-13T15:31:45Z

This is in Google Chrome, right? (by the look of the devtools screenshot). Do you know which specific version? The stack trace you provided is very strange to me, many of the functions in the traceback don't ever call each other.

k-u-s · 2021-07-14T05:27:28Z

Its ff:

But it also happened in Edge 91 but i do not have screenshots from it.

kg · 2021-07-14T06:27:16Z

OK, thanks. We can just assume the stack traces being weird is an FF problem and worry about that separately.

k-u-s · 2021-07-14T09:00:37Z

Below screen from Edge:

kg · 2021-07-14T09:23:28Z

That's very helpful, thank you! It confirms my theory for what's going on here.

k-u-s · 2021-07-14T09:45:57Z

Usually I was able to get this error in about 10 min (around 20 page refresh). But after changing:

try{ await hc.StartAsync();}
catch{}
finally{}

to something like:

try{
var delayTask = Task.Delay(15_000);
var startTask = hc.StartAsync();
await Task.WhenAny(delayTask , startTask );
if(!startTask.IsCompletedSuccessfully)
throw new Exception();
}
catch{}
finally{}

I was not able to get this error in since 3h. But since its hard to reproduce it, not sure if that helped or I was just lucky.

BrennanConroy · 2021-07-14T16:30:12Z

@lewing should we transfer the issue to Runtime?

dotnet-issue-labeler · 2021-07-14T19:58:57Z

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

ghost · 2021-07-14T20:01:50Z

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

Issue Details

Describe the bug

As originally posted in dotnet/aspnetcore#32386 sometimes when loading/refreshing Blazor wsam site that uses signalr connection it fails with message from title. But I do not think it is resolved in net6. This error is somewhe inside
HubConnection.StartAsync(CancellationToken cancellationToken = default). Also wrom whar I observed this exception is not propageted. So if you have something like:

try{ await hc.StartAsync();}
catch{}
finally{}

catch and finally block are never called.

To Reproduce

Similar as in: dotnet/aspnetcore#32386
Its hard to

Exceptions (if any)

Further technical details

ASP.NET Core version: .NET6-previev5

Image is build using tools from

Digest: sha256:789b28fbee1c28b2c637e5b1dcbc54f93bbcd01db1481447dfaccb79f8bd3fae
Status: Downloaded newer image for mcr.microsoft.com/dotnet/sdk:6.0-bullseye-slim

And run inside:

mcr.microsoft.com/dotnet/runtime-deps:6.0-bullseye-slim
Digest: sha256:37068731bf9ae0789e1d28f8d75ac52c7ef4d88e7b81574caa7017ebc8fe0320
Status: Downloaded newer image for mcr.microsoft.com/dotnet/runtime-deps:6.0-bullseye-slim

Thanks for the additional details. Given that we haven't received any other similar feedback we're closing this issue as per your statement it's working correctly in .NET 6.

Originally posted by @mkArtakMSFT in dotnet/aspnetcore#32386 (comment)

Author:	k-u-s
Assignees:	pavelsavara
Labels:	`arch-wasm`
Milestone:	-

pavelsavara · 2021-07-15T17:33:28Z

Have simpler steps to reproduce here #55735

lewing assigned pavelsavara Jul 14, 2021

BrennanConroy transferred this issue from dotnet/aspnetcore Jul 14, 2021

dotnet-issue-labeler bot added the untriaged New issue has not been triaged by the area owner label Jul 14, 2021

lewing added arch-wasm WebAssembly architecture and removed untriaged New issue has not been triaged by the area owner labels Jul 14, 2021

lewing added the area-System.Runtime.InteropServices.JavaScript label Jul 14, 2021

lewing added this to the 6.0.0 milestone Jul 14, 2021

pavelsavara mentioned this issue Jul 15, 2021

[wasm] GC of the callback delegate - Assertion at mono/metadata/class-init.c:2745 #55735

Closed

pavelsavara mentioned this issue Aug 4, 2021

[wasm] Redesign of managed objects marshaling and lifecycle #56538

Merged

ghost added the in-pr There is an active PR which will close this issue when it is merged label Aug 4, 2021

pavelsavara closed this as completed in #56538 Aug 7, 2021

ghost removed the in-pr There is an active PR which will close this issue when it is merged label Aug 7, 2021

ghost locked as resolved and limited conversation to collaborators Sep 7, 2021

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Uncaught Error: The delegate target that is being invoked is no longer available. Please check if it has been prematurely GC'd. #55679

Uncaught Error: The delegate target that is being invoked is no longer available. Please check if it has been prematurely GC'd. #55679

k-u-s commented Jul 13, 2021 •

edited

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BrennanConroy commented Jul 13, 2021

kg commented Jul 13, 2021

k-u-s commented Jul 14, 2021

kg commented Jul 14, 2021

k-u-s commented Jul 14, 2021

kg commented Jul 14, 2021

k-u-s commented Jul 14, 2021

BrennanConroy commented Jul 14, 2021

dotnet-issue-labeler bot commented Jul 14, 2021

ghost commented Jul 14, 2021

pavelsavara commented Jul 15, 2021

Uncaught Error: The delegate target that is being invoked is no longer available. Please check if it has been prematurely GC'd. #55679

Uncaught Error: The delegate target that is being invoked is no longer available. Please check if it has been prematurely GC'd. #55679

Comments

k-u-s commented Jul 13, 2021 • edited Loading

BrennanConroy commented Jul 13, 2021

kg commented Jul 13, 2021

k-u-s commented Jul 14, 2021

kg commented Jul 14, 2021

k-u-s commented Jul 14, 2021

kg commented Jul 14, 2021

k-u-s commented Jul 14, 2021

BrennanConroy commented Jul 14, 2021

dotnet-issue-labeler bot commented Jul 14, 2021

ghost commented Jul 14, 2021

pavelsavara commented Jul 15, 2021

k-u-s commented Jul 13, 2021 •

edited

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