By default fsck runs in preen mode after improper shutdowns. If it finds
serious errors it exits with code 1. The problem is that some times after
abnormal shutdowns (ie power cut-off) the system has BLK errors. Because
this is too often I modified /etc/rc.d/fsck to perform fsck -fy. But then
the system halts and I cannot understand why. I have also tried fsck -fvy.