Often you can find a misbehaving process that somehow got into a weird state, one that you weren't tracing beforehand because you weren't expecting trouble and

Often you can find a misbehaving process that somehow got into a weird state, one that you weren't tracing beforehand because you weren't expecting trouble and didn't want the overhead, and in those cases it can be tremendously useful to be able to attach some inspection tool to figure out what's going on so you can fix the underlying bug.