A complicated clipping masked object is locked to one layer, there's another with a few instructions typed out, the base layer is all guides... when I unlock the clipped object, AI hangs for about 3 minutes then returns to normal but when I select the clipped object to remove the clipping mask, AI siezes up and apparently decides it has 16,777,216.00TB of shared memory. While this is going, processors are running at about 95%. the 16TB number alternates between 0.00 and 5.5+MB, after 5 or minutes, AI crashes on forced quit.
Definitely some sort of true memory leak. Nothing you can do, most likely, but try to open the file in the AI version it was saved on the respective platform. Reporting this via the bug report form will not help your imediate situation, but may interest the engineers: