Nope, only one of them. But thanks to the second processor I am able to handle the deadlock without hard restart of the whole server - which could take up to one hour.
There are no other reasons for 100% CPU usage. I've been monitoring it each day during several months and I know where the problem lies. But, of course, killing threads is only one possibility that can be tried, there are more options, I simply cannot test them all at once :-) You know, this site is not my full-time job.