[Bug 254453] [zone: mbuf] kern.ipc.mbufs limit reached - network memory leaks?

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254453

            Bug ID: 254453
           Summary: [zone: mbuf] kern.ipc.mbufs limit reached - network
                    memory leaks?
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: viaprog at gmail.com

Created attachment 223464
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=223464&action=edit
netstat -m

Server the same is in bug #254419, running on 10gbit ix with nginx sendfile =
off.

# sysctl net.inet.tcp.functions_available
net.inet.tcp.functions_available: 
Stack                           D Alias                            PCB count
freebsd                           freebsd                          61
rack                              rack                             0
bbr                             * bbr                              122508

After some hours network is hang. Works only local console (ikvm).

In /var/log/messages:
Mar 21 07:57:45 serv11 kernel: [zone: mbuf] kern.ipc.nmbufs limit reached
Mar 21 08:02:45 serv11 kernel: [zone: mbuf] kern.ipc.nmbufs limit reached
Mar 21 08:07:45 serv11 kernel: [zone: mbuf] kern.ipc.nmbufs limit reached
Mar 21 08:12:45 serv11 kernel: [zone: mbuf] kern.ipc.nmbufs limit reached
Mar 21 08:17:45 serv11 kernel: [zone: mbuf] kern.ipc.nmbufs limit reached
Mar 21 08:22:45 serv11 kernel: [zone: mbuf] kern.ipc.nmbufs limit reached
Mar 21 08:27:45 serv11 kernel: [zone: mbuf] kern.ipc.nmbufs limit reached

netstat -m in attached screenshot

Server with the same load and configuration but on FreeBSD-12.2-p4 and
net.inet.tcp.functions_default=rack works fine.

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