[Bug]: TCP Accept Queue overflows on macOS

[panjf2000]

Actions I've taken before I'm here

• I've thoroughly read the documentations on this issue but still have no clue.
• I've searched the Github Issues but didn't find any duplicate issues that have been resolved.
• I've searched the internet for this issue but didn't find anything helpful.

What happened?

When I tried to increase the number of clients connecting to the gnet server to 256, it didn't accept all the new connections and hang on accept system call, visit this for more details.

The root cause would be the TCP Accept Queue overflowing, and running sysctl kern.ipc.somaxconn=1000 (default is 128) will fix this issue, although this solution seems to be a palliative rather than a cure for this issue, it could be an OS issue because it only occurred on macOS and worked well on Linux, visit this for details.

Major version of gnet

v2

Specific version of gnet

dev

Operating system

macOS

Relevant log output

https://github.com/panjf2000/gnet/actions/runs/5239348388/jobs/9459102350#step:7:983

Code snippets (optional)

No response

How to Reproduce

go test -v -race -run=TestShutdown$

Does this issue reproduce with the latest release?

It can reproduce with the latest release