Reproduce tdb.close() issue in Go. Comment out db.Close() to make this work.

reproduce-munmap-issue.go

package main

import (
	"os"
    "sync"

    "github.com/traildb/traildb-go"
)

var NUM_WORKERS = 16

func worker(paths chan string, group *sync.WaitGroup) {
    for path := range paths {
        db, err := tdb.Open(path)
        if err != nil {
            panic(err)
        }
        trail, err := tdb.NewCursor(db)
        if err != nil {
            panic(err)
        }
        for i := uint64(0); i < db.NumTrails; i++ {
            tdb.GetTrail(trail, i)
            for {
                event := trail.NextEvent()
                if event == nil {
                    break
                }
            }
        }
        trail.Close()
        db.Close()
    }
    group.Done()
}

func main() {
    paths := make(chan string, len(os.Args) - 1)
    for _, path := range os.Args[1:] {
        paths <- path
    }
    close(paths)

    var workers sync.WaitGroup
    for i := 0; i < NUM_WORKERS; i++ {
        workers.Add(1)
        go worker(paths, &workers)
    }
    workers.Wait()
}