BSOD 201 (DRIVER_VERIFIER_IOMANAGER

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: DRIVER_VERIFIER_IOMANAGER_VIOLATION i/O Verification detected a fatal misuse of IRPs, device objects, completion, cancellation, or other I/O manager.

Could be also:
Constant	Type	OS
ERROR_RELOC_CHAIN_XEEDS_SEGLIM	Win32 error	Windows
HTTP_STATUS_CREATED	HTTP Code	Any

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IRQL_UNEXPECTED_VALUE	PNP_DETECTED_FATAL_ERROR

DRIVER_VERIFIER_IOMANAGER_VIOLATION

DRIVER_VERIFIER_IOMANAGER_VIOLATION meaning

DRIVER_VERIFIER_IOMANAGER_VIOLATION is bug check 0x000000C9. I/O Verification detected a fatal misuse of IRPs, device objects, completion, cancellation, or other I/O manager contracts. Parameter 1 selects the exact rule.

How to analyze the result

Use Parameter 1 and the rule-specific parameters to locate the driver, IRP, object, or dispatch routine. Check ownership, stack locations, completion calls, pending status, cancellation synchronization, and object lifetime.

Preserve the complete dump, all four parameters, Windows build, loaded modules, and the event timeline before changing drivers or firmware while investigating this result.
Run !analyze -v and follow the parameter-specific objects and the stack associated with this result rather than relying only on the symbolic name or a single probable-cause line.
Compare multiple dumps when available; a stable instruction or object path associated with this result is stronger evidence than a module that appears only after earlier corruption.

Recovery boundary

Correct the I/O path in the responsible driver. Suppressing verifier only removes detection; it does not make an invalid IRP or object transition safe.

Official references

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