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Date:      Sat, 02 Feb 2019 15:50:34 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 234341] [Hyper-V] accessing hn0 when running CURRENT under Hyper-V on Windows 10 Pro crashes the machine
Message-ID:  <bug-234341-227-TymAbpsZi4@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-234341-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-234341-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234341

Martin Birgmeier <d8zNeCFG@aon.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|accessing hn0 when running  |[Hyper-V] accessing hn0
                   |CURRENT under Hyper-V on    |when running CURRENT under
                   |Windows 10 Pro crashes the  |Hyper-V on Windows 10 Pro
                   |machine                     |crashes the machine

--- Comment #1 from Martin Birgmeier <d8zNeCFG@aon.at> ---
I just tried this again with head as of r343663, again with an immediate pa=
nic
when accessing the virtual network interface.

I can run FreeBSD under Hyper-V only using the legacy network adapter. Alas,
this is de(4) which is slated for removal soon. So the problem is becoming =
more
pressing.

Is there anyone running FreeBSD successfully under Hyper-V on Windows 10 Pr=
o?
If yes, are there any special settings needed?

Here is a kgdb session of the crash dump written from ddb. Note that if_de =
was
not loaded when the crash occurred, I guess it is only read by kgdb because=
 I
changed /boot/loader.conf back to using it.

[0]# /usr/libexec/kgdb /boot/kernel/kernel /var/crash/vmcore.0
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...

Unread portion of the kernel message buffer:
<118>Clearing /tmp (X related).

Fatal double fault
rip 0x226489 rsp 0x7fffffffe3d0 rbp 0x7fffffffe3d0
rax 0 rdx 0 rbx 0x80072f005
rcx 0x80072ba18 rsi 0x80079b000 rdi 0x80072b9e7
r8 0x1 r9 0x80072ba88 r10 0x80072ba00
r11 0 r12 0 r13 0x7fffffffe4e0
r14 0x80072b9c0 r15 0 rflags 0x10206
cs 0x43 ss 0x3b ds 0x3b es 0x3b fs 0x13 gs 0x1b
fsbase 0x8002548d0 gsbase 0xffffffff80e14500 kgsbase 0
cpuid =3D 1; apic id =3D 01
timeout stopping cpus
panic: double fault
cpuid =3D 1
time =3D 1549121393
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00012f5=
da0
vpanic() at vpanic+0x1b4/frame 0xfffffe00012f5e00
panic() at panic+0x43/frame 0xfffffe00012f5e60
dblfault_handler() at dblfault_handler+0x1de/frame 0xfffffe00012f5f30
Xdblfault() at Xdblfault+0xc3/frame 0xfffffe00012f5f30
--- trap 0x17, rip =3D 0x226489, rsp =3D 0x7fffffffe3d0, rbp =3D 0x7fffffff=
e3d0 ---
KDB: enter: panic

Reading symbols from /boot/kernel/agp.ko...Reading symbols from
/usr/lib/debug//boot/kernel/agp.ko.debug...done.
done.
Loaded symbols for /boot/kernel/agp.ko
Reading symbols from /boot/kernel/ataintel.ko...Reading symbols from
/usr/lib/debug//boot/kernel/ataintel.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ataintel.ko
Reading symbols from /boot/kernel/atapci.ko...Reading symbols from
/usr/lib/debug//boot/kernel/atapci.ko.debug...done.
done.
Loaded symbols for /boot/kernel/atapci.ko
Reading symbols from /boot/kernel/ata.ko...Reading symbols from
/usr/lib/debug//boot/kernel/ata.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ata.ko
Reading symbols from /boot/kernel/ahci.ko...Reading symbols from
/usr/lib/debug//boot/kernel/ahci.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ahci.ko
Reading symbols from /boot/kernel/smb.ko...Reading symbols from
/usr/lib/debug//boot/kernel/smb.ko.debug...done.
done.
Loaded symbols for /boot/kernel/smb.ko
Reading symbols from /boot/kernel/smbus.ko...Reading symbols from
/usr/lib/debug//boot/kernel/smbus.ko.debug...done.
done.
Loaded symbols for /boot/kernel/smbus.ko
Reading symbols from /boot/kernel/intpm.ko...Reading symbols from
/usr/lib/debug//boot/kernel/intpm.ko.debug...done.
done.
Loaded symbols for /boot/kernel/intpm.ko
Reading symbols from /boot/kernel/speaker.ko...Reading symbols from
/usr/lib/debug//boot/kernel/speaker.ko.debug...done.
done.
Loaded symbols for /boot/kernel/speaker.ko
Reading symbols from /boot/kernel/snd_hda.ko...Reading symbols from
/usr/lib/debug//boot/kernel/snd_hda.ko.debug...done.
done.
Loaded symbols for /boot/kernel/snd_hda.ko
Reading symbols from /boot/kernel/sound.ko...Reading symbols from
/usr/lib/debug//boot/kernel/sound.ko.debug...done.
done.
Loaded symbols for /boot/kernel/sound.ko
Reading symbols from /boot/kernel/if_le.ko...Reading symbols from
/usr/lib/debug//boot/kernel/if_le.ko.debug...done.
done.
Loaded symbols for /boot/kernel/if_le.ko
Reading symbols from /boot/kernel/hv_netvsc.ko...Reading symbols from
/usr/lib/debug//boot/kernel/hv_netvsc.ko.debug...done.
done.
Loaded symbols for /boot/kernel/hv_netvsc.ko
Reading symbols from /boot/kernel/hv_vmbus.ko...Reading symbols from
/usr/lib/debug//boot/kernel/hv_vmbus.ko.debug...done.
done.
Loaded symbols for /boot/kernel/hv_vmbus.ko
Reading symbols from /boot/kernel/geom_label.ko...Reading symbols from
/usr/lib/debug//boot/kernel/geom_label.ko.debug...done.
done.
Loaded symbols for /boot/kernel/geom_label.ko
Reading symbols from /boot/kernel/geom_md.ko...Reading symbols from
/usr/lib/debug//boot/kernel/geom_md.ko.debug...done.
done.
Loaded symbols for /boot/kernel/geom_md.ko
Reading symbols from /boot/kernel/procfs.ko...Reading symbols from
/usr/lib/debug//boot/kernel/procfs.ko.debug...done.
done.
Loaded symbols for /boot/kernel/procfs.ko
Reading symbols from /boot/kernel/pseudofs.ko...Reading symbols from
/usr/lib/debug//boot/kernel/pseudofs.ko.debug...done.
done.
Loaded symbols for /boot/kernel/pseudofs.ko
Reading symbols from /boot/kernel/fdescfs.ko...Reading symbols from
/usr/lib/debug//boot/kernel/fdescfs.ko.debug...done.
done.
Loaded symbols for /boot/kernel/fdescfs.ko
Reading symbols from /boot/kernel/if_de.ko...Reading symbols from
/usr/lib/debug//boot/kernel/if_de.ko.debug...done.
done.
Loaded symbols for /boot/kernel/if_de.ko
#0  doadump (textdump=3D<value optimized out>) at pcpu.h:230
230     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) where
#0  doadump (textdump=3D<value optimized out>) at pcpu.h:230
#1  0xffffffff80343dcb in db_dump (dummy=3D<value optimized out>,=20
    dummy2=3D<value optimized out>, dummy3=3D<value optimized out>,=20
    dummy4=3D<value optimized out>)
    at /.../hal/z/SRC/FreeBSD/head/sys/ddb/db_command.c:574
#2  0xffffffff80343b99 in db_command (cmd_table=3D<value optimized out>,=20
    dopager=3D1) at /.../hal/z/SRC/FreeBSD/head/sys/ddb/db_command.c:481
#3  0xffffffff80343914 in db_command_loop ()
    at /.../hal/z/SRC/FreeBSD/head/sys/ddb/db_command.c:534
#4  0xffffffff80346b5f in db_trap (type=3D<value optimized out>,=20
    code=3D<value optimized out>)
    at /.../hal/z/SRC/FreeBSD/head/sys/ddb/db_main.c:252
#5  0xffffffff804fcc14 in kdb_trap (type=3D3, code=3D0, tf=3D<value optimiz=
ed out>)
    at /.../hal/z/SRC/FreeBSD/head/sys/kern/subr_kdb.c:692
#6  0xffffffff8073fcbc in trap (frame=3D0xfffffe00012f5cd0)
    at /.../hal/z/SRC/FreeBSD/head/sys/amd64/amd64/trap.c:619
#7  0xffffffff8071c445 in calltrap ()
    at /.../hal/z/SRC/FreeBSD/head/sys/amd64/amd64/exception.S:232
#8  0xffffffff804fc31b in kdb_enter (why=3D0xffffffff807fea12 "panic",=20
    msg=3D<value optimized out>) at cpufunc.h:65
#9  0xffffffff804b2781 in vpanic (fmt=3D<value optimized out>,=20
    ap=3D0xfffffe00012f5e40)
    at /.../hal/z/SRC/FreeBSD/head/sys/kern/kern_shutdown.c:866
---Type <return> to continue, or q <return> to quit---
#10 0xffffffff804b25a3 in panic (fmt=3D<value optimized out>)
    at /.../hal/z/SRC/FreeBSD/head/sys/kern/kern_shutdown.c:804
#11 0xffffffff807406ce in dblfault_handler (frame=3D<value optimized out>)
    at /.../hal/z/SRC/FreeBSD/head/sys/amd64/amd64/trap.c:970
#12 0xffffffff8071c573 in Xdblfault ()
    at /.../hal/z/SRC/FreeBSD/head/sys/amd64/amd64/exception.S:294
#13 0x0000000000226489 in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal
(kgdb)

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