What does BSOD 0x100 (LOADER_BLOCK_MISMATCH) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The Windows kernel found inconsistent loader block information during startup.

Could be also:
Constant	Type	OS
STATUS_KERNEL_APC	NTSTATUS	Windows
ECVCERORR	errno	Mac

Previous	Next
RESERVE_QUEUE_OVERFLOW	CLOCK_WATCHDOG_TIMEOUT

LOADER_BLOCK_MISMATCH

Boot loader block mismatch for LOADER_BLOCK_MISMATCH

LOADER_BLOCK_MISMATCH is bug check code 0x00000100.

The loader block passes boot-time information to the kernel, including memory descriptors, boot devices, loaded modules, and firmware/platform data. This bug check means that handoff data did not match what the kernel expected.

How to read it in a dump

This is an early boot problem; boot loader, firmware, BCD, hypervisor, and memory map data are central.
A normal application cannot directly cause a loader block mismatch.
Check whether the failure followed boot configuration, imaging, or firmware changes.

What to check

Verify BCD, boot files, firmware mode, Secure Boot state, and hypervisor configuration.
Compare after cold boot versus restart.
Collect boot debugging output when normal crash dumps cannot be written.

References

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