I forgot to say, it's happened using:
linux-image-3.2.0-24-generic
and
linux-image-3.2.0-25-generic
either within xen or without (booting directly the kernel)
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I've been experiencing crashes like this the whole day :
Jun 20 17:46:27 sheeeit kernel: [ 7503.419644] BUG: soft lockup - CPU#2 stuck
for 23s! [Xorg:1740]
Jun 20 17:46:27 sheeeit kernel: [ 7503.419655] Modules linked in: pci_stub
vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) snd_hda_co