Crashes withot logs when using oauth

[Cheshirre]

Description

Crashes without logs when using authorization type "OAUTHBEARER".

client.OAuthBearerSetToken(token.TokenValue, token.Expiration, **null**);

OS -> Ubuntu Linux, MacOS, etc. Nuget package: Confluent.Kafka, Version=2.3.0.0

How to reproduce

Reproduces on unix OS family: local or in docker container. Works on windows.

Set principal to null in client.OAuthBearerSetToken(token.TokenValue, token.Expiration, **null**): https://github.com/confluentinc/confluent-kafka-dotnet/blob/master/test/Confluent.Kafka.IntegrationTests/Tests/OauthBearerToken_PublishConsume.cs

Works, when principal set to empty string.

Checklist

Please provide the following information:

• [ ] A complete (i.e. we can run it), minimal program demonstrating the problem. No need to supply a project file.
• [x] Confluent.Kafka nuget version.
• [ ] Apache Kafka version.
• [ ] Client configuration.
• [x] Operating system.
• [ ] Provide logs (with "debug" : "..." as necessary in configuration).
• [ ] Provide broker log excerpts.
• [x] Critical issue.

[anchitj]

Can you provide debug logs?

[Cheshirre]

Can you provide debug logs?

There are no logs becouse this issue https://github.com/confluentinc/confluent-kafka-dotnet/issues/1834

[fabianpersson]

Still an issue. I am unable to provide any logs, since it crashes with exit code 139 (memory violation issue) OS: Windows 10 (on WSL)/Confluent.Kafka v2.4.0

I was able to get it work with just an empty string however

[shlomiassaf]

Happens to me as well OSX with latest nuget

If principal is set to null it will exit with CODE 139 in with or without a debug session. If principal is set to an empty string, all is ok.