How to fix memory leak +swap_pager_getswapspace(3): failed?

Question

Perl

The Internet periodically falls off on the proxy server on freebsd.
The console gives errors like

+swap_pager_getswapspace(3): failed
+swap_pager_getswapspace(12): failed
+swap_pager_getswapspace(3): failed
+swap_pager_getswapspace(15): failed
+swap_pager_getswapspace(6): failed

The problem is known. On bearded forums, people have been fighting it for a long time. But there is no single solution.
At me FreeBSD v11.0
Samba v4.6.4
In processes many perl eats several processes are started. (see screenshots)