I get a lot of these errors when running CentOS4. Kernel Panic - not syncing: drivers/ide/pci/pix.c:390 spin_lock (drivers/ide/ide.c:c306ad68) already locked by drivers/ide/ide- iops.c/1234. Must be something in the drivers or the kernel, it does not happen using 2.4.x kernels. Maybe some kind of a race condition? Anyone else see these? Gerald