boot hangs near ata

Hi,

for the last few days, -current kernels have been hanging when the ata 
devices are probed. Below is the relevant dmesg snippet (copied by hand, 
because I currently have no way to hook up a serial console):

acpi_cpu: throtteling enabled, 8 steps (100% to 12.5%), currently 100%
ad0: 190782MB <WDC WD2000JB-32EVA0> [387621/16/63] at ata0-master UDMA100
acd0: WARNING - MODE_SENSE_BIG read overrun 34>18
acd0: FAILURE - MODE_SENSE_BIG HARDWARE ERROR asc=0xf1 ascq=0x63 error=0
acd0: FAILURE - MODE_SENSE_BIG HARDWARE ERROR asc=0x00 ascq=0x00 error=0
acd0: WARNING - MODE_SENSE_BIG read overrun 34>18
acd0: FAILURE - MODE_SENSE_BIG HARDWARE ERROR asc=0xf1 ascq=0x63 error=0
acd0: WARNING - MODE_SENSE_BIG read overrun 34>18
acd0: FAILURE - MODE_SENSE_BIG HARDWARE ERROR asc=0xf1 ascq=0x63 error=0
acd0: CDROM <PIONEER DVD-RW DVR-106D> at ata0-slave UDMA33
ad0: TIMEOUT - READ_DMA retrying (2 entries left) LBA=33554495

A kernel from May 4 still boots OK.

This seems to be related to the other recent reports about ATA failures, 
but I have not seen a solution on the list yet - is there one?

Thanks,
Lars
-- 
Lars Eggert                                     NEC Network Laboratories