macOS kernel panic on bombardier benchmark

[ethanent]

Not entirely sure that this is the fault of bombardier. Could easily be more relevant to fasthttp or MacOS networking.

This same error did not occur when a similar server was built using net/http. The net server provided results as expected in the browser.

What version of bombardier are you using?

5e387c23434f632213c1039d5f0ada93d6153f1e

What operating system and processor architecture are you using (if relevant)?

darwin/amd64

macOS 10.15.5 (Catalina)

Go version: go version go1.13.7 darwin/amd64

What did you do?

Run package containing:

package main

import (
	"fmt"
	"net"
)

func main() {
	l, err := net.Listen("tcp", ":8081")

	if err != nil {
		panic(err)
	}

	for {
		conn, err := l.Accept()

		if err != nil {
			fmt.Println(err)

			continue
		}

		go handleConn(conn)
	}
}

func handleConn(c net.Conn) {
	defer c.Close()
	c.Write([]byte(`HTTP/1.1 200 OK
Content-Length: 50

Information about your request:
URL: /
Method: GET
`))
}

Then run command;
bombardier -l localhost:8081

What you expected to happen?

Some results to be printed to console.

What actually happened?

System kernel panic. Upon system restart, received error beginning with:

panic(cpu 0 caller 0xffffff801cac2c5f): assertion failed: NETNS_REF_COUNT(res, flags) != 0, file: /AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-6153.121.2/bsd/skywalk/namespace/netns.c, line: 830

[codesenberg]

That's weird. Might be some issue with networking implementation. Feel free to re-open if you have more details and really want this stuff to be investigated.