BSOD 365 (INVALID_SLOT_ALLOCATOR_FLAGS): causes and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: INVALID_SLOT_ALLOCATOR_FLAGS

Could be also:
Constant	Type	OS
ERROR_CLOUD_FILE_PROPERTY_BLOB_TOO_LARGE	Win32 error	Windows

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INVALID_RUNDOWN_PROTECTION_FLAGS	ERESOURCE_INVALID_RELEASE

INVALID_SLOT_ALLOCATOR_FLAGS

INVALID_SLOT_ALLOCATOR_FLAGS is bug check 0x16D. Microsoft's public contract is narrow: flags supplied to a slot-allocator API were invalid, and parameter 1 contains the rejected flags value. Parameters 2 through 4 are reserved.

Do not infer a public slot format

The bug-check page does not publish the allocator's internal slot structure or a universal set of flag meanings. Diagnose the caller visible in the dump, resolve the function and module, and compare the flags against the contract for the actual API used in that build.

Likely code-review questions

Was the flags variable initialized before the call?
Did a wrapper combine bits from another flag namespace?
Can stale structure data or a truncation/sign conversion reach the flags argument?

The rejected value in parameter 1 is direct evidence; memory or storage tests are not a substitute for tracing how that value was constructed.

References

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