Untitled

Machine check in kernel mode.
Caused by (from SRR1=41030): Transfer error ack signal
Oops: Machine check, sig: 7 [#1]

Modules linked in: raid456 md_mod xor sd_mod usbhid ide_cd cdrom ide_disk sata_sil ohci1394 ohci_hcd ieee1394 usbcore libata scsi_mod sungem sungem_phy i2c_powermac
...
TASK = c1d940b0[573] 'scsi_eh_0' THREAD: c0b7e000
...
NIP [E60B6B2C] ata_altstatus+0x40/0x84 [libata]
LR [E60B719C] ata_bmdma_drive_eh+0xf4/0x16c [libata]
Call Trace:
[C0B7FF00] [00360000] 0x360000 (unreliable)
[C0B7FF10] [E60B719C] ata_bmdma_drive_eh+0xf4/0x16c [libata]
[C0B7FF40] [E60B9E2C] ata_scsi_error+0x28c/0x4d8 [libata]
[C0B7FF70] [E6084FA0] scsi_error_handler+0xd0/0xb08 [scsi_mod]
[C0B7FFC0] [C0040BD8] kthread+0xc4/0x100
[C0B7FFF0] [C0012F78] kernel_thread+0x44/0x60
...