Fault debugging method for dual-controller system

The invention discloses a fault debugging method for a dual-controller system. The fault debugging method comprises the steps of separately allocating a memory region to each of the two controllers in the two-controller system to be used as memory block equipment of the corresponding controller when the two-controller system is started; allocating a section of memory address space to each controller to be used as memory mapping block equipment of the corresponding controller, specific to the memory region of the opposite end controller; establishing mapping between the section of the memory address space and the memory region of the opposite end controller through a non-transparent bridge (NTB); through a file system, formatting the memory mapping block equipment of the corresponding controller, and triggering a debug-damon process to run of the corresponding controller; and when the system fault occurs in any one controller A, enabling the opposite end controller B to trigger the debug-damon process of the c