BSOD 0x52 (MAILSLOT_FILE_SYSTEM): causes and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The mailslot file-system driver detected a fatal internal condition.

Could be also:
Constant	Type	OS
ERROR_CANNOT_MAKE	Win32 error	Windows
ELIBMAX	errno	Linux
EPWROFF	errno	Mac
EREMCHG	errno	Solaris

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REGISTRY_ERROR	NO_BOOT_DEVICE

MAILSLOT_FILE_SYSTEM

Mailslot file system failure for MAILSLOT_FILE_SYSTEM

MAILSLOT_FILE_SYSTEM is bug check code 0x00000052.

Mailslots are a Windows IPC mechanism exposed through the file-system namespace. This bug check points to the kernel mailslot file-system driver or a filter interacting with mailslot create/read/write semantics.

How to read it in a dump

The stack should show whether the failure is in create, read, write, cleanup, close, or filter-driver processing.
Because mailslots are message-oriented IPC, buffer lengths and message boundaries can matter.
It is not the same as an SMB or named-pipe protocol error unless the stack shows those layers.

What to check

Check file-system filters, security products, and legacy IPC-heavy software.
Inspect IRP lifetime and buffer handling around mailslot operations.
Confirm whether the crash requires network browser, legacy service discovery, or old IPC workloads.

References

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