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buffer that has grown beyond max_capacity. This fixes a Xenconsoled segfault that was caused by stomping around above the buffer's allocated region. It became possible to set the max_capacity with changeset 7431, and ever since then we have been exposed to this bug. It would most easily be triggered by running a domain without a client attached to the console, so that the max_capacity was reached more easily. Closes bug #380. Signed-off-by: Ewan Mellor <ewan@xensource.com>