BSOD 0x1000007F (UNEXPECTED_KERNEL_MODE_TRAP

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: This indicates that a trap was generated by the Intel CPU and the kernel failed to catch this trap.

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SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M	KERNEL_MODE_EXCEPTION_NOT_HANDLED_M

UNEXPECTED_KERNEL_MODE_TRAP_M

UNEXPECTED_KERNEL_MODE_TRAP_M is bug check 0x1000007F. Microsoft documents the M variant as having the same meaning and parameters as UNEXPECTED_KERNEL_MODE_TRAP (0x7F): the CPU generated a trap that the kernel did not catch, or the kernel encountered a condition such as a bound trap or double fault.

Use the base 0x7F trap contract

For 0x7F, parameter 1 identifies the trap number. The remaining arguments are reserved or architecture-dependent according to the base reference. Keep the actual 0x1000007F stop value in incident records, but interpret the trap using the Microsoft 0x7F documentation.

Trap-first diagnostics

Decode parameter 1 before choosing a hardware or driver theory; a double fault is not the same condition as another trap type.
Run !analyze -v and inspect the stack and processor context supplied by the dump.
Compare repeated failures by trap number, architecture, and stack rather than merging all 0x1000007F crashes.

References

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