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Unable to evaluate some expressions in debugger #3770

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@koliyo

Description

@koliyo

Issue Description

In last period of time I am now frequently getting problems looking at values and evaluating expressions in the VS Code debugger.

I have not seen this previously, it started occurring in the last month or so. Think it is related to some .NET/OmniSharp update?

When trying to evaluate expressions in the debug console, or in the debug variable viewer I often get

Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

This is not native code, and I never saw these issues before.

Also not, that it is not fully deterministic, sometimes after restarting the debug session, and reaching the same breakpoint it sometimes start working properly :/

I have verified that my libraries are loaded from the Debug directory, so they should not be release build assemblies.

Steps to Reproduce

Not sure

Expected Behavior

Be able to evaluate expressions

Actual Behavior

Some expressions/properties are not inspectable during debugging.

Logs

OmniSharp log

Post the output from Output-->OmniSharp log here

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.45.0
C# Extension: 1.21.18

Mono Information OmniSharp using built-in mono
Dotnet Information .NET Core SDK (reflecting any global.json): Version: 3.1.201 Commit: b1768b4ae7

Runtime Environment:
OS Name: Mac OS X
OS Version: 10.14
OS Platform: Darwin
RID: osx.10.14-x64
Base Path: /usr/local/share/dotnet/sdk/3.1.201/

Host (useful for support):
Version: 3.1.3
Commit: 4a9f85e9f8

.NET Core SDKs installed:
3.1.201 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

Visual Studio Code Extensions
Extension Author Version
auto-close-tag formulahendry 0.5.7
auto-comment-blocks kevinkyang 1.0.1
auto-rename-tag formulahendry 0.1.2
auto-using Fudge 0.7.15
autodocstring njpwerner 0.5.1
better-toml bungcip 0.3.2
blazorsnippets ScottSauber 1.3.0
bracket-pair-colorizer-2 CoenraadS 0.1.1
brick koliyo 0.1.0
camelcasenavigation maptz 1.1.1
change-case wmaurer 1.0.0
cmake twxs 0.0.17
cmake-tools ms-vscode 1.3.1
code-file-nav jakelucas 0.7.2
code-runner formulahendry 0.10.0
code-settings-sync Shan 3.4.3
cpptools ms-vscode 0.28.0-insiders2
csharp ms-dotnettools 1.21.18
dart-code Dart-Code 3.10.1
debugger-for-chrome msjsdiag 4.12.6
dhall-lang panaeon 0.0.4
dotenv mikestead 1.0.1
dotnet-core-essentials KishoreIthadi 0.0.8
dotnet-test-explorer formulahendry 0.7.1
dotnetexplorer mfery 1.0.0
ginfuru-vscode-jekyll-syntax ginfuru 0.1.1
gitlens eamodio 10.2.1
Go ms-vscode 0.14.1
gradle-language naco-siren 0.2.3
hjson laktak 0.3.2
insert-unicode brunnerh 0.8.0
java redhat 0.61.0
jinjahtml samuelcolvin 0.13.0
json-schema-validator tberman 0.1.0
jsonnet heptio 0.1.0
jumpprotobuf ldcf4 0.0.3
kotlin fwcd 0.2.11
language-julia julialang 0.15.29
language-prometheus caarlos0 0.1.2
language-stylus sysoev 1.11.0
lit-html bierner 1.11.1
lsp-inspector-webview octref 0.0.2
markdown-all-in-one yzhang 2.8.0
material-theme zhuangtongfa 3.4.0
mono-debug ms-vscode 0.15.8
nim kosz78 0.6.6
notes canadaduane 1.0.0
npm-intellisense christian-kohler 1.3.0
prettify-json mohsen1 0.0.3
project-manager alefragnani 10.12.0
python ms-python 2020.4.76186
QML bbenoist 1.0.0
remote-containers ms-vscode-remote 0.112.0
remote-ssh ms-vscode-remote 0.51.0
remote-ssh-edit ms-vscode-remote 0.51.0
restructuredtext lextudio 126.0.0
rust rust-lang 0.7.5
scriban xoofx 1.1.0
shader slevesque 1.1.4
swig-tpl zhangciwu 0.0.6
terraform mauve 1.4.0
tslint eg2 1.0.44
vetur octref 0.24.0
vscode-color anseki 0.4.5
vscode-docker ms-azuretools 1.1.0
vscode-eslint dbaeumer 2.1.5
vscode-fileutils sleistner 3.0.1
vscode-graphql Prisma 0.2.14
vscode-icons vscode-icons-team 10.1.1
vscode-jekyll-snippets ginfuru 0.9.3
vscode-jest Orta 3.2.0
vscode-journal pajoma 0.10.0
vscode-markdownlint DavidAnson 0.35.1
vscode-new-file dkundel 4.0.2
vscode-nginx shanoor 0.6.0
vscode-npm-script eg2 0.3.11
vscode-nuget-package-manager jmrog 1.1.6
vscode-open-in-github ziyasal 1.3.6
vscode-open-in-sublime-merge morrislaptop 0.6.0
vscode-paste-and-indent Rubymaniac 0.0.8
vscode-proto3 zxh404 0.4.2
vscode-reveal evilz 4.0.3
vscode-test-explorer hbenl 2.18.0
vscode-theme-onedark akamud 2.2.1
vscode-yaml redhat 0.7.2
vscode-yarn gamunu 1.7.0
vscodeintellicode VisualStudioExptTeam 1.2.7
vsliveshare ms-vsliveshare 1.0.2106
vsnotes patricklee 0.7.1
vue-snippets hollowtree 0.1.11

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