### UPDATE ###
After more tests and a closer look at the ApacheBench sources, we now know that this problem stems from a race condition in ApacheBench.
### END UPDATE ###
The AWS bug I mentioned in my previous post has been confirmed by lead AWS developer Pascal Obry:
Just to let you know that I have been able to reproduce on a fast
GNU/Linux machine.
Feel free to debug that on your side, it will help understanding and
fixing this issue.
Very nice. Now all we have to do is wait for a fix, which I’m sure is right around the corner. The power of open source is amazing!