Re: lhype on 2.6.20-rc2: Guest didn't handle trap 6 at c071b594 (cr2=00000000, err=0)

[Zachary Amsden <zach@vmware.com>]

bert hubert wrote:
> Hi everybody,
>
> Attracted by the puppies, I'm trying to run lhype. The patch applies cleanly
> to 2.6.20-rc2, my .config is in accord with lhype.txt, but when I try to
> launch an instance, I get this:
>
> $ sudo drivers/lhype/lhype_add 64m 0 vmlinux --tunnet=192.168.19.1 --block=linux.img root=/dev/lhba
> lhype_add: Failed to get DMA buffer from 0xb7fff008: No such file or directory
> lhype_add: network: no dma buffer!: No such file or directory
> lhype_add: Running guest failed: No such file or directory
>
> When I subsequently retry, I get the same, but third and following tries
> only give:
>
> lhype_add: Running guest failed: No such file or directory
>
> $ dmesg | tail
> lhype: mapped hypervisor at ffc00000
> (...)
> Guest didn't handle trap 6 at c071b594 (cr2=00000000,err=0)
> Guest 0 dead drivers/lhype/init.c:424
>
> $ file linux.img
> linux.img: x86 boot sector, LInux i386 boot LOader
>
> $ file vmlinux
> vmlinux: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, not stripped
>
> Any clues? I think I've followed lhype.txt to the letter.
>   

Well, I'm not an lhype expert, but the messages indicate a #UD, likely a 
BUG_ON assertion firing somewhere.  I'd try tracking down what function 
was at c071b594 in your kernel and look for assertions there and also at 
drivers/lhype/init.c to see what might have gone wrong.

Zach