mutex and panic

main.go

package main

import (
	"fmt"
	"sync"
)

func main() {
	m := new(sync.Mutex)

	runMe(m)
	m.Lock()
	m.Unlock()
}

func runMe(m *sync.Mutex) {
	defer func() {
		e := recover()
		fmt.Println(e)
	}()
	m.Lock()
	if true {
		panic("wtf")
	}
	// making this `defer m.Unlock()` after `m.Lock()` fixes the deadlock
	m.Unlock()
}