The is a critical hardware-level error known as a Machine Check Exception (MCE) . It occurs when the CPU detects a serious internal hardware fault—such as memory corruption or a bus error—that it cannot correct on its own.
If you're seeing a , check hardware logs and run system diagnostics — the root cause is almost always physical hardware or uncorrectable memory.
In the x64 architecture, exception type 0x12 represents the Machine Check Exception link. This link is used to connect the MCE handler to the processor's error handling mechanism. When an MCE occurs, the processor uses the exception type 0x12 to identify the error condition and transfer control to the MCE handler. x64 exception type 0x12 machinecheck exception link
HARDWARE ERROR. This is not a software issue. CPU 0 BANK 3 MCG status: MCi_STATUS=0xbc000e000f000315 MCE: 0x12 MISC: 0x86 ADDR: 0x7fb3c0000 TIME: 1703000000 LINK: 0x1 (Interconnect: UPI Link 0)
In the x64 architecture, the CPU uses "Machine Check Architecture" (MCA) to monitor hardware health. When the processor encounters a "poisoned" bit of data, a voltage spike, or a parity error in its cache, it triggers . This immediately halts the system to prevent data corruption, often resulting in a Blue Screen of Death (BSOD) on Windows or a Kernel Panic on Linux. Common Causes of Exception 0x12 The is a critical hardware-level error known as
A failing Power Supply Unit (PSU) or degraded Voltage Regulator Modules (VRMs) on the motherboard delivering erratic voltage.
In the debug output, look for:
In the Intel and AMD x64 Machine Check Architecture (MCA), exception vector 18 (which translates to hexadecimal ) is reserved explicitly for the Machine Check Exception ( #MC ).
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. In the x64 architecture, exception type 0x12 represents
In the Linux kernel, the relationship between vector 0x12 and machine-check exceptions is explicitly defined in the architecture-specific headers. The kernel patch from 2009 that defined MCE_VECTOR as 0x12 remains a foundational part of x86 Linux exception handling.
The , more commonly known as a Machine Check Exception (MCE) , is a critical hardware error reported by the CPU when it detects an internal or external hardware inconsistency that it cannot resolve. Unlike software crashes, an MCE indicates that your physical hardware—or the low-level communication between components—has failed. What is a Machine Check Exception?
