2.4.21-pre2 hdparm Kernel Oops

Hi. I haven't seen any discussions about the 2.4.21-pre1 and pre2 kernels kernel panicing when you execute
/sbin/hdparm -d1 -c3 -m16 -k1 /dev/hdb
/sbin/hdparm -d1 -c3 -m16 -k1 /dev/hda

(where /dev/hda contains both my boot and root partitions).

I ran this command in a startup script to improve disk performance. It would cause the kernel to panic on startup. I commented it out of the script, and the newly built kernels would startup and run OK, but when I went back and re-ran the script (with the now running system), it would crash the box. I installed a new version of hdparm (5.3) to make sure it wasn't an old version problem.

Thanks in advance, apologies if it's already been looked at, or if it's just me.

Bob

Is this an oops that looks somewhat like (giving one line of context here):

Freeing unused kernel memory: 88 kbytes.
kernel BUG in header file at line 155
kernel BUG at panic.c:141
invalid operand 0000

CPU: 0

and then traces back with:

Trace; c01a6ce7 <ide_build_sglist+127/160>
Trace; c01a738b <__ide_dma_read+2b/120>

...that's basically what I get with 2.4.21pre2, all drives on the legacy IDE controller of an A7V333 and a PDC MBFastTrack133Lite RAID controller configured in but no drives on it.

I'm doing some hdparms during bootup but I don't think it's getting to them, I should add something to the top of the script to check, but I'd rather not reboot the machine too often.

Apologies for the partial details of the oops, but my pen ran out. :-/

David.

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Please provide controller and drive info and the call traceback