BSOD 37 (NPFS_FILE_SYSTEM): causes and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: NPFS_FILE_SYSTEM

Could be also:
Constant	Type	OS
KERN_TERMINATED	Kern return	Mac
ippStsUnknownCacheSize	Intel Ipp Status	Any
ENOLCK	errno	Linux
EALREADY	errno	Mac
ECHRNG	errno	Solaris

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NTFS_FILE_SYSTEM	CDFS_FILE_SYSTEM

NPFS_FILE_SYSTEM

NPFS_FILE_SYSTEM points at the Named Pipe File System path. NPFS implements Windows named-pipe semantics, so this stop code is materially different from FAT, CDFS, or a storage-volume bug check even though older reference text reused similar pool-exhaustion wording.

Read parameter 1 as a location key

Microsoft defines the high 16 bits of parameter 1 as an internal source-file identifier and the low 16 bits as a source-line number. Preserve that value with the OS build. It is a better discriminator for repeated NPFS failures than guessing from an application that happened to use a named pipe.

Diagnostic focus

Run !analyze -v and inspect the kernel stack for NPFS and filter-driver frames.
Because Microsoft lists nonpaged-pool depletion as a possible cause, check kernel memory pressure instead of treating the pipe name as the root cause.
Correlate the crash with drivers that intercept file-system I/O or IPC traffic; a user-mode named-pipe client cannot by itself explain a kernel stop.

References

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