JSI Tip 0536 - Does your system hang and Event ID 2019 is in the System Event Log?

If your system hangs and the System event log contains:

Event ID: 2019
Description: The server was unable to allocate from the system nonpaged pool because the pool was empty

it may be that an application or service is using a COM port and Serial.sys is allocating memory that it does not release, due to IRQ sharing on COM port devices.

Windows NT does not support this. I do it without any problems (other than a System event at boot) because the shared IRQ COM ports are never in simulaneous use.

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