The packets are handed by the I/O Manager which then routes these packets to the appropriate destination. Stop 0x9F Debugging Guide How is it caused? Typically, a Stop 0x9F with the first parameter is holding the value of 3, means that a certain device object (Windows representation of installed devices), is holding a IRP packet for too long and therefore creating a blockage of any further IRP packets to be processed.Īt this point, for those who do not understand what a IRP is or how it works, quite simply a IRP is a I/O request packet, this data structure is used by the Windows operating system and other drivers to communicate with each other.
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