Console: continuously getting "decmpfs.c:250:_decmp_get_func: tried to access a compressed file of unregistered type 7" from kernel
I suspect this is related to the HFS+ file system compression support
http://forums.macrumors.com/threads/a-hidden-snow-leopard-feature-hfs-compressio n.780570/
It is possible something got corrupted on your disk, and now a file has incorrect metadata indicating a kind of compression that does not exist and this is throwing the error.
The first link might help you find the offending file.
Or you may want to backup your system to an external disk (better yet, make 2 backups), then restore your system. Hopefully the copy out and back will not bring the offending compression error with it. A clone will be the easiest way to restore. Carbon Copy Cloner, SuperDuper, Disk Utility -> Restore are 3 cloning options. But it is also possible to use Time Machine and the recovery partition.