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There is a race condition between domain_create_ring() and the removal of the domU entry from xenstore. If the removal of the domU entry from xenstore comes later than the first xs_gather() call in domain_create_ring(), it will go on and bind the evtchn port to the dying domU, which will cause below error message: (XEN) (file=event_channel.c, line=144) EVTCHNOP failure: domain 0, error -22, line 144 Signed-off-by: Max Zhen <max.zhen@sun.com>