test_asyncio, test_imaplib and test_socket fail with FreeBSD TCP blackhole. When a FreeBSD machine is configured with:

sudo sysctl net.inet.tcp.blackhole=2
sudo sysctl net.inet.udp.blackhole=1

That's the case by default in FreeBSD GCP image:

• connection refused vs time out on FreeBSD cirruslabs/cirrus-ci-docs#483
• https://reviews.freebsd.org/D41751

I'm working on a PR to skip affected tests with such special configuration.

Linked PRs

• gh-109015: Add test.support.socket_helper.tcp_blackhole() #109016
• [3.12] gh-109015: Add test.support.socket_helper.tcp_blackhole() (GH-109016) #109041
• [3.11] gh-109015: Add test.support.socket_helper.tcp_blackhole() (#109016) #109042