[Bug 234753] net/samba47: socket queue overflow stalls server

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234753

            Bug ID: 234753
           Summary: net/samba47: socket queue overflow stalls server
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: timur at FreeBSD.org
          Reporter: michael.osipov at siemens.com
          Assignee: timur at FreeBSD.org
             Flags: maintainer-feedback?(timur at FreeBSD.org)

Our server (FreeBSD 11.2-STABLE i386) recently stalled several times with the
following in the logs:

> Jan  8 09:31:30 blnn714x kernel: sonewconn: pcb 0xc85c4be0: Listen queue overflow: 193 already in queue awaiting acceptance (25 occurrences)
> Jan  8 09:32:47 blnn714x kernel: sonewconn: pcb 0xc85c4be0: Listen queue overflow: 193 already in queue awaiting acceptance (2 occurrences)
> Jan  8 09:33:58 blnn714x kernel: sonewconn: pcb 0xc85c4be0: Listen queue overflow: 193 already in queue awaiting acceptance (6 occurrences)
> Jan  8 09:39:30 blnn714x kernel: sonewconn: pcb 0xc85c4be0: Listen queue overflow: 193 already in queue awaiting acceptance (2 occurrences)

A similar issue has been reported on the Samba mailing list a year ago
(https://lists.samba.org/archive/samba/2018-January/213309.html). The socket
queue is too small and hardcoded in Samba:

> Current listen queue sizes (qlen/incqlen/maxqlen)
> Proto Listen                           Local Address
> tcp4  0/0/128                          *.22
> tcp4  0/0/50                           147.54.64.14.139
> tcp4  0/0/50                           147.54.64.14.445

A decent patch was provided
(https://lists.samba.org/archive/samba/2018-January/213321.html,
https://people.ifm.liu.se/peter/patches/samba/socket_listen_backlog.patch)
though not yet applied.

I requested this on samba-technical
(https://lists.samba.org/archive/samba-technical/2019-January/131870.html).
While this might take time, can we apply this patch to 4.7 and 4.8 to easy the
issue and raise connection queue length?

The patch looks straight-forward to me.

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