Malloc failed to allocate space and did not return null

because malloc Failed to call all the time , And don't return null, It's impossible to judge .
analysis ： Try a variety of ways , Find out malloc An error occurs when allocating space across source files , There is no problem allocating in the original source file , Therefore, the process of allocating space and initializing the calling function , Move from another source file to the original file , There will be no problem with the test , What exactly caused this situation , It's not clear yet .

Is there any big guy who can give you some advice