Description

Since confluent-kafka 2.1.0, subscribing to a non-existent topic causes python to segfault.

How to reproduce

Using the files in this gist, run docker compose, then run script test.py

1. at first, with no modifications
2. then, with the admin client part commented out: in short, don't create the topic

The first run will be successful. The second run will log Segmentation fault (core dumped)

With confluent-kafka 2.0.2, poll returns a message with value b'Subscribed topic not available: test-cf67de5e-e79e-48f7-9300-763fb5b8bc05: Broker: Unknown topic or partition'

Checklist

Please provide the following information:

• confluent-kafka-python and librdkafka version (confluent_kafka.version() and confluent_kafka.libversion()): ('2.1.0', 33619968) ('2.1.0', 33620223)
• Apache Kafka broker version: 2.1.1 (confluent 5.1.2)
• Client configuration: {...}: in the gist
• Operating system: ubuntu 20.04
• Provide client logs (with 'debug': '..' as necessary)
• Provide broker log excerpts
• Critical issue