[Bug 234341] [Hyper-V] accessing hn0 when running CURRENT under Hyper-V on Windows 10 Pro crashes the machine

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234341

Mark Millard <marklmi26-fbsd at yahoo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |marklmi26-fbsd at yahoo.com

--- Comment #3 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Martin Birgmeier from comment #1)

Not that I've done much besides defaults off of basic selections but:

# ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 . . .
        inet6 . . .
        inet 127.0.0.1 netmask 0xff000000 
        groups: lo 
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
hn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=8051b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,TSO4,LRO,LINKSTATE>
        ether . . .
        inet6 . . . 
        inet6 . . . 
        inet . . . 
        media: Ethernet autoselect (10Gbase-T <full-duplex>)
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>

# uname -apKU
FreeBSD FBSDFSSD 13.0-CURRENT FreeBSD 13.0-CURRENT #6 r343670M: Fri Feb  1
16:17:07 PST 2019    
markmi at FBSDFSSD:/usr/obj/amd64_clang/amd64.amd64/usr/src/amd64.amd64/sys/GENERIC-NODBG
 amd64 amd64 1300010 1300010

# kldstat
Id Refs Address                Size Name
 1    9 0xffffffff80200000  2dac788 kernel
 2    1 0xffffffff8321a000     2678 intpm.ko
 3    1 0xffffffff8321d000      b40 smbus.ko
 4    1 0xffffffff8321e000     1600 imgact_binmisc.ko
 5    1 0xffffffff83220000     1ce8 filemon.ko

So no explicit use of any of: hv_netvsc, hv_storvsc, hv_utils, hv_vmbus .
However
the manpages say things like:

NAME
     hv_vmbus -- Hyper-V Virtual Machine Bus (VMBus) Driver

SYNOPSIS
     To compile this driver into the kernel, place the following lines in the
     system kernel configuration file:

           device hyperv
           device pci

And there are (from grep):

/usr/src/sys/amd64/conf/NOTES:device            hyperv          # HyperV
drivers
/usr/src/sys/amd64/conf/GENERIC:device          hyperv                  #
HyperV drivers 
/usr/src/sys/amd64/conf/MINIMAL:device          pci
/usr/src/sys/amd64/conf/GENERIC:device          pci

where I include the standard GENERIC in my conf file that I use. So I expect
that
the 4 are built-in instead of dynamically loaded and so are impliictly in use.


Previously I was at head -r341836 . I've never had problems, going much farther
back.

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