For deadlock to occur, there must not only be a fatal region, but also a sequence of resource requests that has led into the fatal region.

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Deadlock occurs when there is a circular chain of resource dependencies which forms a fatal region. However, for the deadlock to occur there must also be a sequence of resource requests that has led into the fatal region, otherwise the system may simply experience resource contention without a deadlock.

For Deadlock to Occur, There Must Not Only Be a Fatal