in the field of multiprocessor systems of the type including at least one processing module made up of processors which are connected to a main bus or several processing modules which communicate with each other via bus coupling modules , a bus deblocking system is provided in which , using a perfectly mastered process , progressive and iterative deblocking of a multibus system ; subject to a general or overall blocked situation is achieved by allocating to a specific deblocking board a module blocking detection function and a bus release function for the module . the bus release function sends one single decongesting signal having the following effect on all the processors of the module : first , inhibition of the bus allocation system , the system employing simultaneous access request arbitration ; and second , cancellation of the bus ownership signal .