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0e1f616
(Get the code!)
Having a single QEMU process open the same qcow2 file twice is just as dangerous as having two separate QEMU processes open the same qcow2 file concurrently. In both cases you have qcow2 state cached in a BlockDriverState and nothing is able to invalidate the cache in the other BlockDriverState. So short-circuiting locking if the current pid matches would be wrong.