Xen users - May 2008 - domU construcion fails

Hi all,
I got this error starting a domU

Started domain <servername>
                                  xen_start_info @ffffffff80837000
shared @m00befea000 @ffffffff80107000=@ffffffffff5fd000 [0x802]
xen_start_info: @ffffffff80837000
 cr3 0000000000101000 pml4p ffffffff80101ff8
 pml4e 0000000000103067 (real 00000004ea4f4067) pgdp ffffff8000103ff0
 pgde 0000000000105067 (real 00000004e6dca067) pmdp ffffff8000105020
 pmde 0000000000841067 (real 00000004e0dc6067) ptep ffffff80008411b8
 pte 0010000000837027 (real 0010000509c18027)
xen_shared_info: @ffffffffff5fd000
 cr3 0000000000101000 pml4p ffffffff80101ff8
 pml4e 0000000000103067 (real 00000004ea4f4067) pgdp ffffff8000103ff8
 pgde 0000000000000000 is none
PAGE_OFFSET+1.2: @ffffff8000001000
 cr3 0000000000101000 pml4p ffffffff80101ff8
 pml4e 0000000000103067 (real 00000004ea4f4067) pgdp ffffff8000103000
 pgde 0000000000844067 (real 00000004e0dc3067) pmdp ffffff8000844000
 pmde 0000000000845067 (real 00000004e0dc2067) ptep ffffff8000845008
 pte 0000000000001167 (real 000000055ed2c167)
rtc: IRQ 8 is not free.
i8042.c: No controller found.
Kernel panic - not syncing: Attempted to kill init!

What I did was install the kernel-domU kernel into a real server,
clone it with dd and boot it with this config file:
name = "<servername>"
maxmem = "2048"
disk = [ ''phy:/dev/HYP11VM/DISK,sda,w'', ]
vif = [''bridge=xenbr0'',''bridge=xenbr1'' ]
vfb = ["type=vnc,vncunused=1"]
bootloader="/usr/bin/pygrub"
vcpus=2
on_reboot   = ''restart''
on_crash    = ''restart''

My env is:
dom0-> xen 3.2 on 64 bits dom0
<servername> -> 64 bit server with kernel-xenU-2.6.9-67.0.7.EL


the xen logs say:
xc_dom_boot_xen_init: ver 3.2, caps xen-3.0-x86_64 xen-3.0-x86_32p
hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
xc_dom_parse_image: called
xc_dom_find_loader: trying ELF-generic loader ... failed
xc_dom_find_loader: trying multiboot-binary loader ... failed
xc_dom_core.c:499: panic: xc_dom_find_loader: no loader found

[2008-05-02 14:58:21 8653] ERROR (XendDomainInfo:111) Domain construction failed
Traceback (most recent call last):
  File
"/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 109, in create_from_dict
    vm.start()
  File
"/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 420, in start
    XendTask.log_progress(31, 60, self._initDomain)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendTask.py", line
209, in log_progress
    retval = func(*args, **kwds)
  File
"/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 1769, in _initDomain
    raise VmError(str(exn))
VmError: (2, ''Invalid kernel'', ''xc_dom_find_loader:
no loader found\n'')


What do you suggest?

Thanks

Marco

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> I got this error starting a domU
>
> Started domain <servername>
>                                   xen_start_info @ffffffff80837000
> shared @m00befea000 @ffffffff80107000=@ffffffffff5fd000 [0x802]
> xen_start_info: @ffffffff80837000
>  cr3 0000000000101000 pml4p ffffffff80101ff8
>  pml4e 0000000000103067 (real 00000004ea4f4067) pgdp ffffff8000103ff0
>  pgde 0000000000105067 (real 00000004e6dca067) pmdp ffffff8000105020
>  pmde 0000000000841067 (real 00000004e0dc6067) ptep ffffff80008411b8
>  pte 0010000000837027 (real 0010000509c18027)
> xen_shared_info: @ffffffffff5fd000
>  cr3 0000000000101000 pml4p ffffffff80101ff8
>  pml4e 0000000000103067 (real 00000004ea4f4067) pgdp ffffff8000103ff8
>  pgde 0000000000000000 is none
> PAGE_OFFSET+1.2: @ffffff8000001000
>  cr3 0000000000101000 pml4p ffffffff80101ff8
>  pml4e 0000000000103067 (real 00000004ea4f4067) pgdp ffffff8000103000
>  pgde 0000000000844067 (real 00000004e0dc3067) pmdp ffffff8000844000
>  pmde 0000000000845067 (real 00000004e0dc2067) ptep ffffff8000845008
>  pte 0000000000001167 (real 000000055ed2c167)
> rtc: IRQ 8 is not free.
> i8042.c: No controller found.
> Kernel panic - not syncing: Attempted to kill init!
The above is the output from the domU kernel, right?  Including the kernel 
panic message?  Did you get this from an xm create -c?  Was it the complete 
output from that command?  It looks like there some stuff missing from this 
output, maybe some got dropped somehow.  Can you do xm create -c and try 
again?

Was there anything new in "xm dmesg" after booting this domain?
> What I did was install the kernel-domU kernel into a real server,
> clone it with dd and boot it with this config file:
> name = "<servername>"
> maxmem = "2048"
> disk = [ ''phy:/dev/HYP11VM/DISK,sda,w'', ]
> vif = [''bridge=xenbr0'',''bridge=xenbr1''
]
> vfb = ["type=vnc,vncunused=1"]
> bootloader="/usr/bin/pygrub"
> vcpus=2
> on_reboot   = ''restart''
> on_crash    = ''restart''
Well that generally looks sane to me.  You could try setting vcpus=1 and 
seeing if that makes a difference.
> My env is:
> dom0-> xen 3.2 on 64 bits dom0
> <servername> -> 64 bit server with kernel-xenU-2.6.9-67.0.7.EL
>
> the xen logs say:
> xc_dom_boot_xen_init: ver 3.2, caps xen-3.0-x86_64 xen-3.0-x86_32p
> hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
> xc_dom_parse_image: called
> xc_dom_find_loader: trying ELF-generic loader ... failed
> xc_dom_find_loader: trying multiboot-binary loader ... failed
> xc_dom_core.c:499: panic: xc_dom_find_loader: no loader found
>
> [2008-05-02 14:58:21 8653] ERROR (XendDomainInfo:111) Domain construction
> failed Traceback (most recent call last):
>   File
"/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
> line 109, in create_from_dict
>     vm.start()
>   File
"/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
> line 420, in start
>     XendTask.log_progress(31, 60, self._initDomain)
>   File "/usr/lib64/python2.4/site-packages/xen/xend/XendTask.py",
line
> 209, in log_progress
>     retval = func(*args, **kwds)
>   File
"/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
> line 1769, in _initDomain
>     raise VmError(str(exn))
> VmError: (2, ''Invalid kernel'',
''xc_dom_find_loader: no loader found\n'')
That error doesn''t square as the cause of what you''re seeing
above.  That
error suggests you tried booting a kernel at some point that was not loadable 
by Xen; might you have done this earlier?  If the panic message is coming 
from the guest then it must have got loaded somehow, so this 
xc_dom_find_loader problem shouldn''t be the root cause.

Where did you get kernel-xenU-2.6.9-67.0.7.EL from?  I presume you''re
using
RHEL?  Is that a standard RHEL kernel, then?  Where did you install your Xen 
from?  Where is your dom0 kernel from?

Cheers,
Mark


-- 
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/)

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>  The above is the output from the domU kernel, right?  Including the kernel
>  panic message?  Did you get this from an xm create -c?  Was it the
complete
>  output from that command?  It looks like there some stuff missing from
this
>  output, maybe some got dropped somehow.  Can you do xm create -c and try
>  again?
Yes, the message is the output of xm create -c <server>

>  Was there anything new in "xm dmesg" after booting this domain?
nothing new

>  Well that generally looks sane to me.  You could try setting vcpus=1 and
>  seeing if that makes a difference.
Any change with vcpus=1

>  That error doesn''t square as the cause of what you''re
seeing above.  That
>  error suggests you tried booting a kernel at some point that was not
loadable
>  by Xen; might you have done this earlier?  If the panic message is coming
>  from the guest then it must have got loaded somehow, so this
>  xc_dom_find_loader problem shouldn''t be the root cause.
>
I see.. Today I also tried to boot this domain with a new kernel (for
xenU) built  from the sources downloaded by the official web site:
nothing changes, I have the same error.

>  Where did you get kernel-xenU-2.6.9-67.0.7.EL from?  I presume
you''re using
>  RHEL?  Is that a standard RHEL kernel, then?  Where did you install your
Xen
>  from?  Where is your dom0 kernel from?
Yes, this is a kernel installed with yum for centos linux

I think an option could be reinstalling the server :-(


Thanks

Marco

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