[TooBrokeToBeg]

I don't understand why this is so interesting, as it doesn't seem to be anything about regression per se.

A userland tool supported functionality that it can't anymore, because it isn't available in a new kernel. This is not surprising, as people find ways to access and change data outside of published APIs all the time and they get patched away. The userland author said that the kernel upgrade would break old versions of the tool. So what?