I just want to echo that we have a server (QSol, dual 1.6G AMDcpus, scsi raid 2.4.18-3smp #1 SMP cat /proc/modules 3c59x 29064 2 ipchains 46184 13 usb-ohci 21568 0 (unused) usbcore 77024 1 [usb-ohci] ext3 70720 4 jbd 53504 4 [ext3] DAC960 65280 5 sd_mod 12896 0 (unused) scsi_mod 112208 1 [sd_mod] ) That shows the same kernel BUG at commit.c:535 invalid operation error message. John