problems with mdk kernel

Hi! i have problems with patch for 2.4.18 with mdk kernel 2.4.18-16mdk. I patch the kernel with a few rejects (2), one of them is for printk and the other is for a makefile problem, i fixed that problems and rebuild the kernel. it builds without a problem, but when i use it, i have problems with supermount. I think is a problem with packet-cd and supermount because i didn't have problems with super if i use the same kernel but without packetcd. The problem i have is that if i change to the cdrom directory (/mnt/cdrom) and do an "ls" i get always ls: .: Stale NFS file handle but if y do "ls /mnt/cdrom" then it works.