This is a race that can happen when migrating TCG guests under load.
It was introduced by the change to run vCPUs outside the big QEMU lock.

Paolo Bonzini (4):
  memory: remove memory_region_test_and_clear_dirty
  memory: hide memory_region_sync_dirty_bitmap behind
    DirtyBitmapSnapshot
  memory: introduce memory_global_after_dirty_log_sync
  memory: unify loops to sync dirty log bitmap

 exec.c                       | 31 ++++++++++++++++++
 hw/display/cg3.c             |  1 -
 hw/display/exynos4210_fimd.c |  1 -
 hw/display/framebuffer.c     |  1 -
 hw/display/g364fb.c          |  1 -
 hw/display/sm501.c           |  1 -
 hw/display/tcx.c             |  2 --
 hw/display/vga.c             |  6 ----
 include/exec/memory.h        | 47 +++++++++------------------
 memory.c                     | 76 +++++++++++++++++---------------------------
 migration/ram.c              |  1 +
 11 files changed, 76 insertions(+), 92 deletions(-)

-- 
2.14.3


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