lhype guest oops

lhype guest oops

[Karl Rister]

I am trying to experiment with lhype on a 32bit Intel box and when I launch a 
guest I get the following oops message:

-----------
invalid opcode: 0000 [#1]
Modules linked in:
CPU:    0
EIP:    0061:[<c0101223>]    Not tainted VLI
EFLAGS: 00010246   (2.6.20-rc2 #1)
EIP is at mwait_idle_with_hints+0x1e/0x3a
eax: c03c8008   ebx: 00000000   ecx: 00000000   edx: 00000000
esi: 00000000   edi: c03c8008   ebp: 4c687970   esp: c03c9f74
ds: 007b   es: 007b   ss: 0069
Process swapper (pid: 0, ti=c03c8000 task=c039c420 task.ti=c03c8000)
Stack: 00000000 c040102c c03fd120 c0101333 c03ca693 c0344d03 c03ca1b8 c03fd120
       c03fe320 c03d5b56 00000000 00000000 00401000 00000001 00000000 00000000
       c03fd120 c040102c 00000100 c040101c c03fd020 92000000 0000000f c039fee0
Call Trace:
 [<c0101333>] cpu_idle+0x39/0x4e
 [<c03ca693>] start_kernel+0x2d9/0x2dd
 [<c03ca1b8>] unknown_bootoption+0x0/0x202
 [<c03d5b56>] lhype_init+0x35f/0x366
 [<c03d5b5d>] lhype_maybe_init+0x0/0x1a
 =======================
Code: 11 00 00 00 e8 13 0e 01 00 83 c4 0c c3 57 56 53 89 c6 89 d3 89 e0 25 00 
e0 ff ff 8d 78 08 8b 40 08 a8 08 75 1e 31 c9 89 f8 89 ca <0f> 01 c8 89 e0 25 
00 e0 ff ff 8b 40 08 a8 08 75 07 89 f0 89 d9
EIP: [<c0101223>] mwait_idle_with_hints+0x1e/0x3a SS:ESP 0069:c03c9f74
 <0>Kernel panic - not syncing: Attempted to kill the idle task!
 lhype_add: CRASH: Attempted to kill the idle task!
-----------

The invocation of lhype_add that I made is:

./linux-2.6.20-rc2/drivers/lhype/lhype_add --verbose 64m 
0 /boot/vmlinux-2.6.20-rc2-lhype --tunnet=192.168.0.1 --block=linux-test/linux.img 
root=/dev/lhba

Can anyone point me in the direction of figuring this out?

Thanks.

-- 
Karl Rister

Re: lhype guest oops

[Rusty Russell]

On Fri, 2007-01-05 at 16:14 -0600, Karl Rister wrote:
> I am trying to experiment with lhype on a 32bit Intel box and when I launch a 
> guest I get the following oops message:

> EIP: [<c0101223>] mwait_idle_with_hints+0x1e/0x3a SS:ESP 0069:c03c9f74

Hi Karl!

	There are two possible solutions to this.  First is to upgrade to the
latest patch, which fixes this (and speed up lhype significantly), or
boot the guest with "idle=halt".

	The problem is caused by lhype not masking out the MWAIT capability, so
the guest thinks it can use that instruction (it can't).

Thanks for the bug report!
Rusty.

Re: lhype guest oops

[Karl Rister]

On Friday 05 January 2007 11:23 pm, Rusty Russell wrote:
> On Fri, 2007-01-05 at 16:14 -0600, Karl Rister wrote:
> > I am trying to experiment with lhype on a 32bit Intel box and when I
> > launch a guest I get the following oops message:
> >
> > EIP: [<c0101223>] mwait_idle_with_hints+0x1e/0x3a SS:ESP 0069:c03c9f74
>
> Hi Karl!
>
> 	There are two possible solutions to this.  First is to upgrade to the
> latest patch, which fixes this (and speed up lhype significantly), or
> boot the guest with "idle=halt".
>
> 	The problem is caused by lhype not masking out the MWAIT capability, so
> the guest thinks it can use that instruction (it can't).
>
> Thanks for the bug report!
> Rusty.

Upgrading to the latest patch as suggested fixed it.  Thanks.

-- 
Karl Rister