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INSUFFICIENT_SYSTEM_MAP_REGS
System map register exhaustion for INSUFFICIENT_SYSTEM_MAP_REGS
INSUFFICIENT_SYSTEM_MAP_REGS is bug check code 0x00000045. System map registers are used in DMA and memory-mapping paths that let devices address buffers. This bug check points to a driver or platform path that could not obtain enough mapping resources for the requested transfer.
How to read it in a dump
- Look for a storage, network, display, or bus-mastering device driver on the stack.
- The transfer size and DMA adapter state matter more than the symbolic code alone.
- Repeated failures can indicate a driver that leaks map registers or builds unsupported scatter/gather requests.
What to check
- Audit DMA transaction sizes, scatter/gather lists, and cancellation paths.
- Use Driver Verifier DMA checking for a suspect driver.
- Check whether the issue appears only with high I/O load or specific hardware.
References
Dump evidence
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 “this result”; that sentence identifies the failure class, while the parameters and stack determine which object, driver, processor, or subsystem instance was involved.
Analysis order
- Run WinDbg
!analyze -v, then inspect the documented meaning of each parameter instead of relying only on the probably-caused-by line. - find the earliest abnormal event: driver update, firmware change, device reset, storage error, verifier report, resource exhaustion, or application hang connected with insufficient / system / map / regs.
- 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 this result before collecting the dump and event logs. Recovery actions should follow the component identified by the stack and parameters, not merely the symbolic stop-code name.
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