threadsafe nuclei engine memory leak when Close then New again

[iuliu8899]

Nuclei version:

v3.2.7

Current Behavior:

Expected Behavior:

Steps To Reproduce:

func main() {
    for {
	en, _ := nuclei.NewThreadSafeNucleiEngine()
	en.GlobalResultCallback(func(event *output.ResultEvent) {
		fmt.Println(event.Matched, event.Host)
	})
	_ = en.ExecuteNucleiWithOpts([]string{"http://xxxx:port"}, nuclei.WithTemplateFilters(nuclei.TemplateFilters{ExcludeSeverities: severity.Info.String()}))
	en.Close()
    }
}

first round:

second round:

third round:

Showing nodes accounting for 419.27MB, 69.01% of 607.58MB total
Dropped 289 nodes (cum <= 3.04MB)
Showing top 10 nodes out of 179
      flat  flat%   sum%        cum   cum%
  104.54MB 17.21% 17.21%   104.54MB 17.21%  reflect.New
   68.30MB 11.24% 28.45%    68.30MB 11.24%  gopkg.in/yaml%2ev2.(*parser).scalar
   65.16MB 10.72% 39.17%    65.16MB 10.72%  github.com/projectdiscovery/nuclei/v3/pkg/utils/yaml.PreProcess
   46.84MB  7.71% 46.88%    46.84MB  7.71%  regexp/syntax.(*compiler).inst
   30.02MB  4.94% 51.82%   251.06MB 41.32%  github.com/projectdiscovery/nuclei/v3/pkg/templates.(*Parser).ParseTemplate
   28.02MB  4.61% 56.43%   249.03MB 40.99%  github.com/projectdiscovery/nuclei/v3/pkg/templates.parseTemplate
   26.51MB  4.36% 60.79%    26.51MB  4.36%  reflect.mapassign_faststr0
   19.01MB  3.13% 63.92%    66.02MB 10.87%  github.com/projectdiscovery/nuclei/v3/pkg/protocols/http/httpclientpool.wrappedGet
   17.01MB  2.80% 66.72%    17.01MB  2.80%  github.com/projectdiscovery/retryablehttp-go.DefaultReusePooledTransport
   13.89MB  2.29% 69.01%    13.89MB  2.29%  strings.(*Builder).grow

and so on...

dose the threadsafe engine just not support close() then renew ?

Anything else: