ExecutionEngineException when using step-by-step

[Kuinox]

Description

When trying to find the source of an "CancelledOperationException" being thrown in background in my app, I stumbled on a weird bug.
When I step in a specific place, it will throw a ExecutionEngineException, and if I try to continue the program execution it will freeze VS2022 (and I must kill it with taskmanager).
As I don't know where the issue come from, I created the issue here.

Reproduction Steps

Clone my repo Kuinox/CK-LogViewer@ac8a945 and checkout on the commit linked (it was the develop branch when this issue was opened).

Run LogSampleGenerator until it hit the Debugger.Break().
Now due to this issue: dotnet/sdk#1458, 3 pdb must be loaded by hand in VS, they are located in the nuget cache:
%userprofile%\.nuget\packages\ck.mqtt.abstractions\0.10.0\lib\net6.0
%userprofile%\.nuget\packages\ck.mqtt.common\0.10.0\lib\net6.0
%userprofile%\.nuget\packages\ck.mqtt.client\0.10.0\lib\net6.0
Now navigate to

CK.MQTT.Client.dll!CK.MQTT.SmallOutgoingApplicationMessageExtensions.PublishAsync(CK.MQTT.IMqtt3Client client, CK.Core.IActivityMonitor m, string topic, CK.MQTT.QualityOfService qos, bool retain, System.ReadOnlyMemory<byte> payload) Line 13	C#
CK.Monitoring.MQTT.dll!CK.Monitoring.MQTT.MQTT.DoHandleAsync(CK.Core.IActivityMonitor m, CK.Monitoring.IMulticastLogEntry entry) Line 29	C#

Now trying to step in SendPacketAsync throw the ExecutionEngineException.
Pressing F5/F10 here lead to VS freezing.

Expected behavior

Being able to debug my program.

Actual behavior

An ExecutionEngineException is throwed.

Regression?

I don't know, new app/code.

Known Workarounds

No response

Configuration

.NET 6.0.1 Windows 11/10

Other information

No response

Tagging subscribers to this area: @tommcdon
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

When trying to find the source of an "CancelledOperationException" being thrown in background in my app, I stumbled on a weird bug.
When I step in a specific place, it will throw a ExecutionEngineException, and if I try to continue the program execution it will freeze VS2022 (and I must kill it with taskmanager).
As I don't know where the issue come from, I created the issue here.

Reproduction Steps

Clone my repo Kuinox/CK-LogViewer@ac8a945 and checkout on the commit linked (it was the develop branch when this issue was opened).

Run LogSampleGenerator until it hit the Debugger.Break().
Now due to this issue: dotnet/sdk#1458, 3 pdb must be loaded by hand in VS, they are located in the nuget cache:
%userprofile%\.nuget\packages\ck.mqtt.abstractions\0.10.0\lib\net6.0
%userprofile%\.nuget\packages\ck.mqtt.common\0.10.0\lib\net6.0
%userprofile%\.nuget\packages\ck.mqtt.client\0.10.0\lib\net6.0
Now navigate to

CK.MQTT.Client.dll!CK.MQTT.SmallOutgoingApplicationMessageExtensions.PublishAsync(CK.MQTT.IMqtt3Client client, CK.Core.IActivityMonitor m, string topic, CK.MQTT.QualityOfService qos, bool retain, System.ReadOnlyMemory<byte> payload) Line 13	C#
CK.Monitoring.MQTT.dll!CK.Monitoring.MQTT.MQTT.DoHandleAsync(CK.Core.IActivityMonitor m, CK.Monitoring.IMulticastLogEntry entry) Line 29	C#

Now trying to step in SendPacketAsync throw the ExecutionEngineException.
Pressing F5/F10 here lead to VS freezing.

Expected behavior

Being able to debug my program.

Actual behavior

An ExecutionEngineException is throwed.

Regression?

I don't know, new app/code.

Known Workarounds

No response

Configuration

.NET 6.0.1 Windows 11/10

Other information

No response

Author:	Kuinox
Assignees:	-
Labels:	area-Diagnostics-coreclr, untriaged
Milestone:	-

[Kuinox]

Tell me if you successfully reproduced it or if you want that I make a more minimal reproduction.

[tommcdon]

HI @Kuinox I'm not able to reproduce the issue. Under Debug->Options, I have Just My Code disabled and Suppress JIT optimization on module load enabled. Without those settings I was not able to step into the SendPacketAsync function. I am seeing that an InvalidOperationException is being thrown from that function:

If you are still able to reproduce the issue, would you mind capturing a dump and uploading it through a VS Feedback Ticket (to protect your privacy)? Once the feedback ticket is created, please paste a link to in in this Github issue and we'll be able to find it.

[tommcdon]

@Kuinox I hit send too soon above. To collect a dump, please choose Debug->Save Dump As in VS.

[Kuinox]

I am seeing that an InvalidOperationException is being thrown from that function:

Oh sorry ! I forgot that it had to connect to a mosquitto server running on localhost :(.
Looks like I can't create a dump.

[Kuinox]

I created a dump using dotnet-dump cli tool and made a ticket on VS Feedback, sadly it looks like the ticket & dump file is public and I can't find a way to make it not public :/
https://developercommunity.visualstudio.com/t/ExecutionEngineException-when-using-step/1626148

[danmoseley]

@Kuinox I've sent out an urgent request internally to try to get it deleted. I'm not sure why it's public -- if I remember a correctly there's a checkbox that makes it public.

[Kuinox]

@Kuinox I've sent out an urgent request internally to try to get it deleted. I'm not sure why it's public -- if I remember a correctly there's a checkbox that makes it public.

Thanks ! I don't think there is anything important as it's not my work machine, but it's better be safe.

I was not sure it would be public, and didn't found any checkbox to make it public or private, in fact there is even a "secured" (what does it mean ?) indicator next to the form:

[tommcdon]

Thanks @danmoseley! @Kuinox I've downloaded the dump so it's safe to delete the uploaded files.

[Kuinox]

Thanks @danmoseley! @Kuinox I've downloaded the dump so it's safe to delete the uploaded files.

Ok, I edited the ticket to remove the link to the uploaded dump.