The run of the clone as requested in comment #8, but on on linux-
generic3.0.0.16 ubuntu serie, gave the ata1 error with first frozen
guest than crashing host again:

Mar 29 11:31:37 ubuntu kernel: [ 4282.711738] type=1400 
audit(1333013497.298:29): apparmor="STATUS" operation="profile_load" 
name="libvirt-b7685d07-b779-a45f-2b87-4801bba1152a" pid=8363 
comm="apparmor_parser"
Mar 29 11:31:39 ubuntu kernel: [ 4284.744460] device vnet1 entered promiscuous 
mode
Mar 29 11:31:39 ubuntu kernel: [ 4284.749717] virbr0: topology change detected, 
propagating
Mar 29 11:31:39 ubuntu kernel: [ 4284.749729] virbr0: port 2(vnet1) entering 
forwarding state
Mar 29 11:31:39 ubuntu kernel: [ 4284.749736] virbr0: port 2(vnet1) entering 
forwarding state
Mar 29 11:31:43 ubuntu kernel: [ 4288.904465] kvm: 8372: cpu0 unhandled rdmsr: 
0xc0010001
Mar 29 11:31:46 ubuntu kernel: [ 4291.631723] virbr0: port 1(vnet0) entering 
forwarding state
Mar 29 11:31:46 ubuntu kernel: [ 4291.632067] device vnet0 left promiscuous mode
Mar 29 11:31:46 ubuntu kernel: [ 4291.632073] virbr0: port 1(vnet0) entering 
disabled state
Mar 29 11:31:47 ubuntu kernel: [ 4292.868939] type=1400 
audit(1333013507.458:30): apparmor="STATUS" operation="profile_remove" 
name="libvirt-a35f2704-32c6-8e25-132b-0590ad56180b" pid=8446 
comm="apparmor_parser"
Mar 29 11:31:49 ubuntu kernel: [ 4294.928080] vnet1: no IPv6 routers present
Mar 29 11:45:07 ubuntu kernel: [ 5092.451441] ata1.00: exception Emask 0x50 
SAct 0x1 SErr 0x280900 action 0x6 frozen
Mar 29 11:45:07 ubuntu kernel: [ 5092.451453] ata1.00: irq_stat 0x08000000, 
interface fatal error
Mar 29 11:45:07 ubuntu kernel: [ 5092.451462] ata1: SError: { UnrecovData 
HostInt 10B8B BadCRC }
Mar 29 11:45:07 ubuntu kernel: [ 5092.451470] ataMar 29 11:55:27 ubuntu kernel: 
imklog 5.8.1, log source = /proc/kmsg started.

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https://bugs.launchpad.net/bugs/965525

Title:
  kvm Ubuntu12.04 64bit guest got frozen

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