Statistics crashing updating resource allocation

A driver may also fail to delete pending deferred procedure calls (DPCs), worker threads, queues and other resources that will cause problems when the driver unloads.

In sum, kernel components such as drivers need to be privileged, which makes even slight errors therein capable of crashing the system, yet such errors are often difficult to detect, difficult to match to the source of the problem and/or difficult to reproduce.Other kernel component errors involve lists of resources maintained by the kernel to facilitate driver operations, and the failure of the driver to properly delete its listed information when no longer needed.For example, a driver may request that the kernel keep timers for regularly generating events therefor, or create lookaside lists, which are fixed-sized blocks of pooled memory that can be used by a driver without the overhead of searching the pool for a matching size block, and thus are fast and efficient for repeated use.For example, if a driver requests twenty-four bytes, it will receive one thirty-two byte block, eight for the header followed by the requested twenty-four bytes.However, if the driver writes past the twenty-fourth byte, the driver will corrupt the next header, whereby the kernel may, for example, later coalesce the next block with an adjacent block even though the next block may be allocated to another kernel component.

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