ircevent deadlock

deadlock.go

package main

import (
	"crypto/tls"
	"fmt"
	"time"

	"github.com/thoj/go-ircevent"
)

const serverssl = "testnet.oragono.io:6697"

func main() {
	stamp := time.Now().UnixNano() % int64(time.Second)
	nick := fmt.Sprintf("deadlock-%d", stamp)
	channel := fmt.Sprintf("#ircevent-%d", stamp)
	irccon := irc.IRC(nick, "IRCTestSSL")
	irccon.Debug = true
	irccon.UseTLS = true
	irccon.TLSConfig = &tls.Config{InsecureSkipVerify: true}
	irccon.AddCallback("001", func(e *irc.Event) { irccon.Join(channel) })
	irccon.AddCallback("366", func(e *irc.Event) {
		// simulate being disconnected in the middle of a callback:
		// send a raw QUIT command, outside of irccon.Quit(), which will
		// cause the server to disconnect us:
		irccon.SendRaw("QUIT")
		// fill up the local send queue:
		for i := 0; i < 10; i++ {
			irccon.Privmsg(channel, "hi")
		}
		// give the server time to disconnect us:
		time.Sleep(1 * time.Second)
		// fill up the send queue again:
		for i := 0; i < 20; i++ {
			irccon.Privmsg(channel, "hi")
		}
	})
	err := irccon.Connect(serverssl)
	if err != nil {
		fmt.Printf("Err %s", err)
		return
	}
	irccon.Loop()
}

trace.txt

SIGQUIT: quit         
PC=0x46daa1 m=0 sigcode=0                                                                                                               
                                                                    
goroutine 0 [idle]:                                             
runtime.futex(0x782a70, 0x80, 0x0, 0x0, 0x7ffc00000000, 0x7ffc12bb1918, 0x7ffc12b86868, 0x1, 0x7ffc12b86878, 0x40da9f, ...)
        runtime/sys_linux_amd64.s:579 +0x21                 
runtime.futexsleep(0x782a70, 0x0, 0xffffffffffffffff)
        runtime/os_linux.go:44 +0x46
runtime.notesleep(0x782a70)
        runtime/lock_futex.go:159 +0x9f               
runtime.mPark()                               
        runtime/proc.go:1340 +0x39
runtime.stopm()                                   
        runtime/proc.go:2257 +0x92                                                                                                      
runtime.findrunnable(0xc000026000, 0x0)                      
        runtime/proc.go:2916 +0x72e                              
runtime.schedule()                                            
        runtime/proc.go:3125 +0x2d7
runtime.park_m(0xc000001b00)
        runtime/proc.go:3274 +0x9d
runtime.mcall(0x0)
        runtime/asm_amd64.s:327 +0x5b
                                                                    
goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc000132010)
        runtime/sema.go:56 +0x45
sync.(*WaitGroup).Wait(0xc000132008)
        sync/waitgroup.go:130 +0x65
github.com/thoj/go-ircevent.(*Connection).Loop(0xc000132000)
        github.com/thoj/go-ircevent/irc.go:242 +0x273
main.main()
        command-line-arguments/simple.go:43 +0x3fd
                                                                    
goroutine 19 [select]:   
github.com/thoj/go-ircevent.(*Connection).RunCallbacks(0xc000132000, 0xc0001d23c0)
        github.com/thoj/go-ircevent/irc_callback.go:178 +0x53f
github.com/thoj/go-ircevent.(*Connection).readLoop(0xc000132000)
        github.com/thoj/go-ircevent/irc.go:88 +0x4f8
created by github.com/thoj/go-ircevent.(*Connection).Connect
        github.com/thoj/go-ircevent/irc.go:484 +0x45e

goroutine 36 [chan send]:
github.com/thoj/go-ircevent.(*Connection).Privmsg(...)
        github.com/thoj/go-ircevent/irc.go:310
main.main.func2(0xc0001d23c0)
        command-line-arguments/simple.go:35 +0x2ad
github.com/thoj/go-ircevent.(*Connection).RunCallbacks.func1(0xc000132000, 0x0, 0xc0001a1a40, 0xc0000241c0, 0xc0001d23c0)
        github.com/thoj/go-ircevent/irc_callback.go:164 +0x6a
created by github.com/thoj/go-ircevent.(*Connection).RunCallbacks
        github.com/thoj/go-ircevent/irc_callback.go:162 +0x45e