[Question]: conn_map.go:66 panic concurrent map read and map write

[PotatoCloud]

Actions I've taken before I'm here

• I've thoroughly read the documentations about this problem but still have no answer.
• I've searched the Github Issues/Discussions but didn't find any similar problems that have been solved.
• I've searched the internet for this problem but didn't find anything helpful.

Questions with details

when the number of connections is relatively high (like C50K), panic will occur.

fatal error: concurrent map read and map write

goroutine 12107 [running]:
github.com/panjf2000/gnet/v2.(*connMatrix).getConn(...)
        /Users/dev/go/pkg/mod/github.com/panjf2000/gnet/v2@v2.3.4/conn_map.go:66
github.com/panjf2000/gnet/v2.(*eventloop).close(0xc00097ca80, 0xc003f6b6c0, {0xba6040, 0xc002263980})
        /Users/dev/go/pkg/mod/github.com/panjf2000/gnet/v2@v2.3.4/eventloop_unix.go:174 +0xb3
github.com/panjf2000/gnet/v2.(*conn).write(0xc003f6b6c0, {0x0, 0x0, 0x0})
        /Users/dev/go/pkg/mod/github.com/panjf2000/gnet/v2@v2.3.4/connection_unix.go:137 +0x112
github.com/panjf2000/gnet/v2.(*conn).Write(0xbac128?, {0x0?, 0xc005330dd8?, 0x956b0f?})
        /Users/dev/go/pkg/mod/github.com/panjf2000/gnet/v2@v2.3.4/connection_unix.go:353 +0x4d
github.com/gobwas/ws.WriteFrame({0xba5ec0, 0xc0030f6a10}, {{0x1, 0x0, 0xa, 0x0, {0x0, 0x0, 0x0, 0x0}, ...}, ...})
        /Users/dev/go/pkg/mod/github.com/!real!fax/ws@v0.3.0/write.go:95 +0x50
github.com/gobwas/ws/wsutil.writeFrame({0xba5ec0?, 0xc0030f6a10?}, 0x78?, 0xf?, 0x33?, {0x0?, 0xc005330f78?, 0x409632?})
        /Users/dev/go/pkg/mod/github.com/!real!fax/ws@v0.3.0/wsutil/writer.go:570 +0x2f0
github.com/gobwas/ws/wsutil.WriteMessage(...)
        /Users/dev/go/pkg/mod/github.com/!real!fax/ws@v0.3.0/wsutil/helper.go:161
github.com/gobwas/ws/wsutil.WriteServerMessage(...)
        /Users/dev/go/pkg/mod/github.com/!real!fax/ws@v0.3.0/wsutil/helper.go:167
github.com/RealFax/peregrine.DefaultOnPingHandler(0xc004e61901?)
        /Users/dev/go/pkg/mod/github.com/!real!fax/peregrine@v0.6.1/handler.go:23 +0x37
github.com/RealFax/peregrine.(*Server).OnTraffic.func1()
        /Users/dev/go/pkg/mod/github.com/!real!fax/peregrine@v0.6.1/server.go:204 +0x1f
github.com/panjf2000/ants/v2.(*goWorker).run.func1()
        /Users/dev/go/pkg/mod/github.com/panjf2000/ants/v2@v2.9.0/worker.go:67 +0x8d
created by github.com/panjf2000/ants/v2.(*goWorker).run in goroutine 1160
        /Users/dev/go/pkg/mod/github.com/panjf2000/ants/v2@v2.9.0/worker.go:48 +0x5c

Code snippets (optional)

No response

[panjf2000]

If you think you're running into a bug, please open an issue with the template of bug report and fill out all requested info.

[PotatoCloud]

Sorry, it's my fault, I didn't use AsyncWrite