[Bug 238741] RACK tcpip stack causes connections to hang

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238741

            Bug ID: 238741
           Summary: RACK tcpip stack causes connections to hang
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: adrik at salesmanager.nl

When using the RACK tcpip stack, fetch will hang and eventually generate a
timeout.
To reproduce the problem:

# uname -a
FreeBSD mail.xxx.yyy 12.0-RELEASE-p6 FreeBSD 12.0-RELEASE-p6 r349226 MAIL 
amd64
# kldload tcp_rack
# sysctl net.inet.tcp.functions_default=rack
# fetch https://cpan.metacpan.org/authors/id/I/IS/ISHIGAKI/JSON-PP-4.03.tar.gz

When using wget, the same url can be retrieved without problems.

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