Problems after a big lot of requests

[wusikijeronii]

Hello.
I have a problem with memory leaking in vibe-d and today I tried hunt-framework. Even after 100 requests per 1 sec, I have a few problems:

1. Web resource is unavailable. I get a timeout error.
   In log a see error:

Failure on accept Unable to accept socket connection: Too many open files

logs.log
cURL response:

 curl localhost:8080 -v -m 10                                                                                                                                                                    
*   Trying 127.0.0.1:8080...
* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET / HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.79.1
> Accept: */*
> 
* Operation timed out after 10001 milliseconds with 0 bytes received
* Closing connection 0
curl: (28) Operation timed out after 10001 milliseconds with 0 bytes received

P.S.: in OS (Manjaro Linux) I set ulimit to 5000 however the error appears.
2. Also memory leaking. In the screenshot below, I sent 1000 requests in 1 minute.

After I stop sending requests values of mem and res don't change.

How to reproduce:

git clone https://github.com/huntlabs/hunt-skeleton.git myproject
cd myproject
dub run -v
wrk -t8 -d10m -c2000 http://localhost:8080

wrk is a simple benchmark tool.