BSOD 149 (PNP_INTERNAL_ERROR): causes and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The Plug and Play manager detected an unrecoverable internal state violation.

Could be also:
Constant	Type	OS
ERROR_IS_SUBST_TARGET	Win32 error	Windows
EALREADY	errno	Solaris

PNP_INTERNAL_ERROR

Plug and Play manager internal failure

PNP_INTERNAL_ERROR is bug check code 0x00000095. This bug check is raised when the PnP manager or a participating driver violates device-node, IRP, resource, remove, start, or power-state expectations. It is normally a driver or bus/PnP state-machine problem.

How to read it in a dump

Parameter 1 is the most important value because it identifies the PnP subcode.
Other parameters can point to device objects, device nodes, IRPs, or internal PnP structures depending on the subcode.
Analyze it together with the device stack rather than as a generic boot or hardware failure.

What to check

Use !devnode, !devstack, and Driver Verifier on the suspect bus/function/filter driver.
Correlate with hot-plug, surprise removal, sleep/resume, driver update, and resource rebalance.
Check for pending IRPs that were completed twice, not completed, or completed in the wrong state.

References

Looking for a different code? Search another status or error code.