There is a bug in the block flush code due to a patch linus pushed. This will cause system hardlocks for anyone using 2.6.39-ck1 based patchsets and BFS enabled. It is fixed in -ck2. Resolution: - Mask anything using -ck1 - Bump to -ck2 - profit
CK2 available in ck-sources-2.6.39-r2.ebuild.