dotnet --info hitting /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found on Latest net8.0

[LoopedBard3]

Describe the bug

After installing the latest 8.0 daily dotnet using the dotnet-install script onto a clean ubuntu-20.04 or ubuntu-22.04 image, running dotnet --info errors out with:

dotnet: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by dotnet)
dotnet: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by dotnet)

To Reproduce

On a clean ubuntu-22.04 image, download the dotnet-install.sh script.
Run: .\dotnet-install.sh -Architecture x64 -Channel 8.0 -Quality daily,
Run: dotnet --info
The failure should occur here.

Exceptions (if any)

dotnet: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by dotnet)
dotnet: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by dotnet)

Further technical details

Last known working SDK version: 8.0.100-preview.3.23178.7
Failing SDK version: 8.0.100-preview.4.23219.2

Thank you!

[MichalStrehovsky]

@sbomer does this sound familiar?

[sbomer]

This is potentially related to dotnet/runtime#84148, which changed the minimum glibc and libstdc++. But Ubuntu 20.04 should provide compatible versions of these libraries. I am not seeing this problem with dotnet --info, using the following dockerfile:

FROM ubuntu:20.04

RUN apt-get update && apt-get install -y wget

RUN wget https://dot.net/v1/dotnet-install.sh

RUN chmod +x dotnet-install.sh
RUN ./dotnet-install.sh -Architecture x64 -Channel 8.0 -v 8.0.100-preview.4.23219.2

# Runtime dependencies
RUN apt-get install -y libicu66

RUN $HOME/.dotnet/dotnet --info

In general, you'll need to install runtime dependencies including libstdc++, as in https://github.com/dotnet/dotnet-docker/blob/3bbd0b1b1f48f4c487a252a72fb894efd847549f/src/runtime-deps/8.0/jammy/arm64v8/Dockerfile#L7-L14.

[sbomer]

@LoopedBard3 could you compare the scenario that's failing with the steps in my dockerfile?

[LoopedBard3]

I will take a look! The specific ubuntu image we use is the one from github so I will need to check what version is on it: https://github.com/actions/runner-images/blob/main/images/linux/Ubuntu2204-Readme.md

[LoopedBard3]

Looks like this was being hit because the centOS container we were using doesn't have the GLIBCXX versions in the default paths. I am not sure if they have them installed in general, but I found this on SO https://stackoverflow.com/questions/44205687/glibcxx-3-4-21-not-found-on-centos-7 that somewhat indicates it does. To fix this we switched the containers we could to ubuntu 18.04 containers. Thanks for the help!

[sbomer]

For anyone else who hits this issue: .NET 8 drops support fer CentOS 7 (see the plan in dotnet/runtime#83428). CentOS 7 doesn't have the newer glibc that we depend on.