BSOD 0xFF (RESERVE_QUEUE_OVERFLOW): causes and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A kernel reserve queue overflowed or exhausted its expected capacity.

Could be also:
Constant	Type	OS
ERROR_EA_LIST_INCONSISTENT	Win32 error	Windows
STATUS_ALREADY_COMPLETE	NTSTATUS	Windows

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BUGCODE_USB_DRIVER	LOADER_BLOCK_MISMATCH

RESERVE_QUEUE_OVERFLOW

Kernel reserve queue overflow for RESERVE_QUEUE_OVERFLOW

RESERVE_QUEUE_OVERFLOW is bug check code 0x000000FF.

This bug check indicates that an internal reserved queue grew beyond the expected limit. It is most useful when the stack identifies the subsystem that owns the queue, such as memory manager, I/O, networking, or a legacy driver path.

How to read it in a dump

The queue owner is more important than the symbolic name.
Look for a producer that continues queuing while the consumer is blocked or failing.
Resource exhaustion can be the result, not the root cause.

What to check

Inspect the owning subsystem and queue entries in the dump.
Check for stuck worker threads, blocked DPCs, or failed I/O completion.
Use performance and event logs to correlate resource pressure before the crash.

References

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