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Date: Fri, 8 Apr 2016 09:22:37 +0100 (BST)
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Subject: RE: Revision 297176 - hyperv/evttimer: Use an independent message
 slot so that it can work
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Hello

I recently update one of my many vms from an older CURRENT revision r297196=
=20
to r297659 and on reboot it just panics with the following:

FreeBSD clang version 3.8.0 (tags/RELEHSE_380/final 262564) (based on LLVM=
=20
3.8.0
)
VT(vga): text 80x25
Timecounter "Hyper-V" frequency 10000000 Hz quality 10000000
Kernel trap 9 with interrupts disabled


Fatal trap 9: general protection fault while in kernel mode
cpuid =3D 0: apic id =3D 00
instruction pointer=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0x20:0xffffffff8100d6?9
stack pointer=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
=3D 0x28:oxffffffff820d5c30
frame pointer=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
=3D 0x28:oxffffffff820d5c40
code segment=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 =3D base 0x0, limit 0xfffff, type 0x1b
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D DPL 0, =
pres 1, long 1, def32 0, gran 1
processor eflags=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D IOPL =3D 0
current process=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0 ()
[ thread pid 0 tid 0 ]
stopped at=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 hv_get_timecount+0x9:=C2=A0=C2=A0 =
rdmsr
db) wh
Tracing pid 0 tid 0 td 0xffffffff81d0eff0
hv_get_timecount() at hv_get_timecount+0x9/frame 0xffffffff820d5c40
tc_init() at tc_init+0x251/frame 0xffffffff820d5c90
mi_startup() at mi_startup+0x118/frame 0xffffffff820d5cb0
btext() at btext+ox2c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D
db>

I changed hv_hv.c back to the previous revision (297176) and no panics unde=
r=20
Xen VM.

Thanks!

p.s. not sure why Xen gets detected as HyperV