`mono` eats up CPU on MacOS

Issue Description

Not sure exactly where to put this (here, VSCode or dotnet/runtime). Mono is absolutely killing my CPU randomly. Don’t have anything special running (just this app) with 2 tabs open. This issue is not specific to that sample app as I’ve seen it occur randomly in the past as well.

I have the macos sample which I believe is a proc dump to share offline.

Logs

OmniSharp log

[Logs.txt](https://github.com/OmniSharp/omnisharp-vscode/files/7187660/Logs.txt)

C# log

Does not show anything

Environment information

VSCode version: 1.60.1 C# Extension: 1.23.15

Mono Information

OmniSharp using built-in mono

Dotnet Information

.NET SDK (reflecting any global.json): Version: 6.0.100-rc.2.21457.23 Commit: 7b7148685e

Runtime Environment: OS Name: Mac OS X OS Version: 11.6 OS Platform: Darwin RID: osx.11.0-x64 Base Path: /Users/tanay/dev/aspnetcore/.dotnet/sdk/6.0.100-rc.2.21457.23/

Host (useful for support): Version: 7.0.0-alpha.1.21457.1 Commit: 7292301fc5

.NET SDKs installed: 6.0.100-preview.3.21160.5 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-preview.3.21168.19 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-preview.4.21216.8 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-preview.5.21264.3 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-preview.7.21324.2 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-preview.7.21356.3 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-preview.7.21364.4 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-rc.1.21401.2 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-rc.1.21415.3 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-rc.2.21424.34 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-rc.2.21430.28 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 6.0.100-rc.2.21457.23 [/Users/tanay/dev/aspnetcore/.dotnet/sdk] 7.0.100-alpha.1.21463.2 [/Users/tanay/dev/aspnetcore/.dotnet/sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 3.1.13 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.1.14 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-dev [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-preview.3.21158.2 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-preview.3.21168.5 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-preview.4.21215.16 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-preview.5.21263.4 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-preview.7.21322.5 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-preview.7.21355.4 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-preview.7.21363.16 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-rc.1.21381.3 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-rc.1.21413.12 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-rc.2.21420.26 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-rc.2.21430.13 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.0-rc.2.21455.6 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 7.0.0-alpha.1.21426.33 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 7.0.0-dev [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 2.1.25 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 2.1.27 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.13 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.14 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.3.21157.6 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.3.21166.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.3.21167.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.4.21201.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.4.21211.7 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.4.21215.2 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.4.21216.6 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.5.21263.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.6.21302.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.7.21321.15 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.7.21325.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.7.21351.2 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.7.21355.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.7.21360.10 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-preview.7.21363.9 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21372.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21372.4 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21374.7 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21375.2 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21376.24 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21378.2 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21378.9 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21401.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21401.3 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21405.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21414.4 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.1.21421.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.2.21423.6 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.2.21424.25 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.2.21430.13 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.2.21457.6 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.2.21466.4 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.0-alpha.1.21419.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.0-alpha.1.21425.4 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.0-alpha.1.21430.29 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.0-alpha.1.21457.1 [/Users/tanay/dev/aspnetcore/.dotnet/shared/Microsoft.NETCore.App]

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

Visual Studio Code Extensions

Extension	Author	Version
azure-account	ms-vscode	0.9.8
csharp	ms-dotnettools	1.23.15
EditorConfig	EditorConfig	0.16.4
jupyter	ms-toolsai	2021.8.2041215044
jupyter-keymap	ms-toolsai	1.0.0
markdown-all-in-one	yzhang	3.4.0
python	ms-python	2021.9.1230869389
vscode-icons	vscode-icons-team	11.6.0
vscode-paste-image	mushan	1.0.4
vscode-pylance	ms-python	2021.9.1
vscode-typescript-tslint-plugin	ms-vscode	1.3.3

[TanayParikh]

I haven’t seen this issue in a while now, feel free to close out 😄

[JoeRobich]

@TanayParikh Can you try the latest omnisharp build by setting omnisharp.path to latest? I am hoping this unreleased bug fix resolves your problem.