Sorry, the screenshot does show that the deadlock is on a spinlock
during flush_tlb_others(), perhaps at

        if (nr_cpu_ids > NUM_INVALIDATE_TLB_VECTORS)
                raw_spin_lock(&f->tlbstate_lock);

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https://bugs.launchpad.net/bugs/977391

Title:
  BUG: soft lockup - CPU#8 stuck for 61s! [kvm:*]   in lucid

Status in QEMU:
  Confirmed
Status in “linux” package in Ubuntu:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  Two days back  my KVM base machine got hung up all of a sudden.
  Not sure what exactly happened.

  cat /proc/version_signature 
  Ubuntu 2.6.32-28.55-server 2.6.32.27+drm33.12

  
  -Rahul N.

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