[Bug 256657] [tcp] RACK unsuitable for jails on stable/13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256657

            Bug ID: 256657
           Summary: [tcp] RACK unsuitable for jails on stable/13
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: zarychtam@plan-b.pwste.edu.pl

Created attachment 225871
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=225871&action=edit
Traffic dump collected on lo0 intefrace

Some RACK fixes and improvements MFCed lately to stable/13 have made RACK
unusable in the jail environment. The last working build is from June 4th and
it was probably 92f49c769b4e.

Problem description:
The database client (mysql/mariadb) running in the jail is no more able to
access the database over the network socket on the host (mysql/mariadb) neither
on the 127.0.0.1 address nor on the shred interface address (10.x.x.x). It is
classic jail, not VNET jail. Switching to
net.inet.tcp.functions_default=freebsd solves the issue. The problem occurs
irregardless of the used net.inet.tcp.cc.algorithm (tested with htcp and
newreno).

Conclusion:
Testing RACK on FreeBSD is becoming really hard task. Switching to default
net.inet.tcp.functions_default=freebsd solves a lot of issues and reduces the
PR submitting ratio.

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