Today the rig crashed with a UNEXPECTED_KERNEL_MODE_TRAP error.

The UNEXPECTED_KERNEL_MODE_TRAP bug check has a value of 0x0000007F. This bug check indicates that the CPU generated a trap and the kernel failed to catch this trap.

This trap could be a bound trap (a trap the kernel is not permitted to catch) or a double fault (a fault that occurred while processing an earlier fault, which always results in a system failure).

Bug check 0x7F typically occurs after you install a faulty or mismatched hardware (especially memory) or if installed hardware fails.

A double fault can occur when the kernel stack overflows. This overflow occurs if multiple drivers are attached to the same stack. For example, if two file system filter drivers are attached to the same stack and then the file system recurses back in, the stack overflows.


This error spawned when I removed the USB Bluetooth adapter from the USB 2.0 front panel to a USB 3.1 front panel with more power. It seems that the USB Bluetooth radio needs more than 500 mA of current.

There are abundant problems from the BIOS and GPU drivers and Windows is not always able to cope.