[Bug 271275] [Hyper-V] Kernel cannot attach 4th NIC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271275

            Bug ID: 271275
           Summary: [Hyper-V] Kernel cannot attach 4th NIC
           Product: Base System
           Version: Unspecified
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: buccilorenzo@virgilio.it

On Hyper-V virtual machines with Windows Server 2008 R2 as host, FreeBSD fails
to attach more than three network adapters.

During boot the attach of the 4th (and consequently the 5th, 6th, ...) NIC,
called as hn3, returns the error message:

hn3: <Hyper-V Network Interface> on vmbus0
hn3: gpadl_conn(chan13) failed: 3221225540
hn3: chim gpadl conn failed: 5
device_attach: hn3 attach returned 5

I've run several tests and the problem occurs on all versions of FreeBSD (I've
tried from 10.4 onwards).

It shouldn't be a Hyper-V bug because on other guest OSes, like Windows or
Debian, the problem doesn't occur.

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