Virtualization - Apr 2007 - lhype on 2.6.20-rc2: Guest didn't handle trap 6 at c071b594 (cr2=00000000, err=0)

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

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.

Thanks!

-- 
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http://netherlabs.nl              Open and Closed source services

On Wed, 2006-12-27 at 14:25 +0100, 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
Hi Bert!

	Ah, this is your clue, here: looks like the kernel ran BUG() or
otherwise failed at address 0xc071b594...  can you send your .config and
I can see if I can reproduce?  Your System.map should indicate what's at
that address, to...

	I should really try to read out the BUG info in this case; I'll patch
something up today (I'm chasing James Morris' initrd bug at the moment).

Thanks!
Rusty.