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Date:      Wed, 16 Jun 2021 19:55:01 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 256657] [tcp] RACK unsuitable for jails on stable/13
Message-ID:  <bug-256657-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D256657

            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=3D225871&action=
=3Dedit
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 a=
nd
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) nei=
ther
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=3Dfreebsd solves the issue. The problem occu=
rs
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=3Dfreebsd solves a lot of issues and reduces=
 the
PR submitting ratio.

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