Comment 3 for bug 282536

I'm getting a very similar message with the Intrepid amd64 kernel. I've also compiled 2.6.29.1 with SLAB and that also produces the error.

I have two Sony IDE DVD-ROM Drives that lock up as soon as these errors start appearing in the logs.

relevant portion of dmesg:

[ 1360.017031] ata4.01: qc timeout (cmd 0xa0)
[ 1360.017045] ata4.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 1360.017054] ata4.01: cmd a0/00:00:00:00:00/00:00:00:00:00/b0 tag 0
[ 1360.017055] cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 1360.017056] res 51/20:03:00:00:00/00:00:00:00:00/b0 Emask 0x5 (timeout)
[ 1360.017059] ata4.01: status: { DRDY ERR }
[ 1360.017081] ata4: soft resetting link
[ 1360.421238] ata4.00: configured for UDMA/33
[ 1360.453232] ata4.01: configured for UDMA/33
[ 1361.555496] ata4: EH complete
[ 1400.021132] ata4.00: qc timeout (cmd 0xa0)
[ 1400.021145] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 1400.021153] ata4.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[ 1400.021154] cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 1400.021155] res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
[ 1400.021158] ata4.00: status: { DRDY ERR }
[ 1400.021179] ata4: soft resetting link
[ 1400.425231] ata4.00: configured for UDMA/33
[ 1400.457225] ata4.01: configured for UDMA/33
[ 1400.729058] ata4: EH complete
[ 1405.729032] ata4.00: qc timeout (cmd 0xa0)
[ 1405.729044] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 1405.729051] ata4.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[ 1405.729052] cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 1405.729053] res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
[ 1405.729056] ata4.00: status: { DRDY ERR }
[ 1405.729077] ata4: soft resetting link
[ 1406.133230] ata4.00: configured for UDMA/33
[ 1406.165223] ata4.01: configured for UDMA/33
[ 1409.448316] ata4: EH complete
[ 1425.805042] ata4.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 1425.805052] ata4.01: cmd a0/00:00:00:00:00/00:00:00:00:00/b0 tag 0
[ 1425.805053] cdb 1e 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 1425.805054] res 40/00:02:00:08:00/00:00:00:00:00/b0 Emask 0x4 (timeout)
[ 1425.805057] ata4.01: status: { DRDY }
[ 1425.805078] ata4: soft resetting link
[ 1426.209230] ata4.00: configured for UDMA/33
[ 1426.241239] ata4.01: configured for UDMA/33
[ 1431.241032] ata4.00: qc timeout (cmd 0xa0)
[ 1431.241041] ata4.00: TEST_UNIT_READY failed (err_mask=0x5)
[ 1431.241062] ata4: soft resetting link
[ 1431.645229] ata4.00: configured for UDMA/33
[ 1431.677222] ata4.01: configured for UDMA/33
[ 1436.805565] ata4: EH complete
[ 1495.805040] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 1495.805050] ata4.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[ 1495.805051] cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 1495.805052] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[ 1495.805054] ata4.00: status: { DRDY }
[ 1495.805075] ata4: soft resetting link
[ 1496.209229] ata4.00: configured for UDMA/33
[ 1496.241223] ata4.01: configured for UDMA/33
[ 1500.816927] ata4: EH complete
[ 1540.025032] ata4.00: qc timeout (cmd 0xa0)
[ 1540.025043] ata4.00: limiting speed to UDMA/25:PIO4
[ 1540.025048] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 1540.025056] ata4.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[ 1540.025057] cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 1540.025057] res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
[ 1540.025060] ata4.00: status: { DRDY ERR }
[ 1540.025081] ata4: soft resetting link
[ 1540.429231] ata4.00: configured for UDMA/25
[ 1540.461225] ata4.01: configured for UDMA/33
[ 1545.461033] ata4.00: qc timeout (cmd 0xa0)
[ 1545.461041] ata4.00: TEST_UNIT_READY failed (err_mask=0x5)
[ 1545.461063] ata4: soft resetting link
[ 1545.865230] ata4.00: configured for UDMA/25
[ 1545.897223] ata4.01: configured for UDMA/33
[ 1550.897031] ata4.00: qc timeout (cmd 0xa0)
[ 1550.897039] ata4.00: TEST_UNIT_READY failed (err_mask=0x5)
[ 1550.897042] ata4.00: limiting speed to UDMA/25:PIO3
[ 1550.897063] ata4: soft resetting link
[ 1551.301245] ata4.00: configured for UDMA/25
[ 1551.333223] ata4.01: configured for UDMA/33
[ 1556.333032] ata4.00: qc timeout (cmd 0xa0)
[ 1556.333040] ata4.00: TEST_UNIT_READY failed (err_mask=0x5)
[ 1556.333043] ata4.00: disabled
[ 1556.333054] ata4.01: TEST_UNIT_READY failed (err_mask=0x40)
[ 1556.333072] ata4: soft resetting link
[ 1556.713230] ata4.01: configured for UDMA/33
[ 1561.713031] ata4.01: qc timeout (cmd 0xa0)
[ 1561.713039] ata4.01: TEST_UNIT_READY failed (err_mask=0x5)
[ 1561.713043] ata4.01: limiting speed to UDMA/33:PIO3
[ 1561.713063] ata4: soft resetting link
[ 1562.093244] ata4.01: configured for UDMA/33
[ 1567.093032] ata4.01: qc timeout (cmd 0xa0)
[ 1567.093041] ata4.01: TEST_UNIT_READY failed (err_mask=0x5)
[ 1567.093043] ata4.01: disabled
[ 1567.093080] ata4: soft resetting link
[ 1567.417103] ata4: EH complete