I'm just installed (successfull) kernel-2.6.16-1.2069_FC4 from FC4 updates. After this I made an attempt to boot this kernel. The attempt ended with error "mount: error 6 mounting ext3".
Previous kernlel (kernel-2.6.15-1.1833_FC4) work fine.
Hardware:
Asus P5GD2-x motherboard, HDD: SATA 200G + IDE 120G