@Dwarden, when will this ticket be assigned?

@tsipa740, thank you for reproducing this error.
we have the same result.
we have determined the following limit for the amount of your own PBO files: 640 - 643 PBO
we wait until the BIS development accepts and solves the problem.

same fixed issue in Arma3: https://feedback.bistudio.com/T117183

same issue on Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-33-generic x86_64).
is not a open files limit problem - i have set all parameters correctly:
/etc/sysctl.conf:
fs.file-max = 2097152

any comment from bistudio would be good

It's not fixed.
~# ll /proc/15446/fd | wc -l
1053 <--- server can not find

It's not fixed.
~# ll /proc/15446/fd | wc -l
1053 <--- server can not find

Can confirm, we are having this same issue.
.# ll /proc/20075/fd | wc -l
1051 <----- max. open files !!!!!!!!