[2.4.19] invalidate: busy buffer

Hello,

I have the following setup:

Redhat 8.0 installed on a raid software on 2 identical 40GB Maxtor disks, one partition only as / and I get the error mentioned in the subject when I do hdparm -Tt /dev/md0 for example, but it also appears when I reboot at the very end of the init reboot stage.

Teo