xenstored does handle concurrent writes very harshly - it aborts the whole transaction if any other write happened the same time. For udev (which process all the events almost at once) it means hundreds of retries and in some times even exceed udev timeout (60s or so). To prevent this problem, add locking to allow only one such event being processed at once. It looks like it should slow down the system startup, but actually it does otherwise.release2 mm_b51435c9
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