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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 for LOADER_BLOCK_MISMATCH
- 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 for LOADER_BLOCK_MISMATCH
- 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 for LOADER_BLOCK_MISMATCH
- Boot-start driver distribution disk
- Microsoft Bug Check Code Reference
- Analyze a kernel-mode dump with WinDbg
Dump evidence for LOADER_BLOCK_MISMATCH
For LOADER_BLOCK_MISMATCH, preserve the complete dump, the four bug-check parameters, the exact Windows build, loaded-module list, and the event timeline immediately before the stop. AllStat summarizes the condition as “LOADER_BLOCK_MISMATCH”; that sentence identifies the failure class, while the parameters and stack determine which object, driver, processor, or subsystem instance was involved.
Analysis order for LOADER_BLOCK_MISMATCH
- Run WinDbg
!analyze -v, then inspect the documented meaning of each LOADER_BLOCK_MISMATCH parameter instead of relying only on the probably-caused-by line. - For LOADER_BLOCK_MISMATCH, find the earliest abnormal event: driver update, firmware change, device reset, storage error, verifier report, resource exhaustion, or application hang connected with loader / block / mismatch.
- For LOADER_BLOCK_MISMATCH, keep third-party filter, security, storage, graphics, and virtualization drivers in the module inventory; removing evidence before dump analysis can obscure the responsible path.
Do not repeatedly reboot a machine affected by LOADER_BLOCK_MISMATCH before collecting the dump and event logs. For LOADER_BLOCK_MISMATCH, recovery actions should follow the component identified by the stack and parameters, not merely the symbolic stop-code name.
Dump evidence for LOADER_BLOCK_MISMATCH
For LOADER_BLOCK_MISMATCH, preserve the complete dump, the four bug-check parameters, the exact Windows build, loaded-module list, and the event timeline immediately before the stop. AllStat summarizes the condition as “LOADER_BLOCK_MISMATCH”; that sentence identifies the failure class, while the parameters and stack determine which object, driver, processor, or subsystem instance was involved.
Analysis order for LOADER_BLOCK_MISMATCH
- Run WinDbg
!analyze -v, then inspect the documented meaning of each LOADER_BLOCK_MISMATCH parameter instead of relying only on the probably-caused-by line. - For LOADER_BLOCK_MISMATCH, find the earliest abnormal event: driver update, firmware change, device reset, storage error, verifier report, resource exhaustion, or application hang connected with loader / block / mismatch.
- For LOADER_BLOCK_MISMATCH, keep third-party filter, security, storage, graphics, and virtualization drivers in the module inventory; removing evidence before dump analysis can obscure the responsible path.
Do not repeatedly reboot a machine affected by LOADER_BLOCK_MISMATCH before collecting the dump and event logs. For LOADER_BLOCK_MISMATCH, recovery actions should follow the component identified by the stack and parameters, not merely the symbolic stop-code name.
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