Re: sata_nv + ADMA + Samsung disk problem

[Tejun Heo]

Gabor Gombas wrote:
> Hi,
> 
> Since I have upgraded to 2.6.22.1 from 2.6.20 I have problems with
> Samsung disks. Sometimes the disks stall for about half a minute and
> then I have these messages in the logs:
> 
> Aug  6 20:10:11 twister kernel: ata7: EH in ADMA mode, notifier 0x0 notifier_error 0x0 gen_ctl 0x1501000 status 0x400 next cpb count 0x0 next cpb idx 0x0
> Aug  6 20:10:12 twister kernel: ata7: CPB 0: ctl_flags 0x9, resp_flags 0x0
> Aug  6 20:10:12 twister kernel: ata7: timeout waiting for ADMA IDLE, stat=0x400
> Aug  6 20:10:12 twister kernel: ata7: timeout waiting for ADMA LEGACY, stat=0x400
> Aug  6 20:10:12 twister kernel: ata7.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
> Aug  6 20:10:12 twister kernel: ata7.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x0 data 0 
> Aug  6 20:10:12 twister kernel:          res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
> Aug  6 20:10:12 twister kernel: ata7: soft resetting port
> Aug  6 20:10:12 twister kernel: ata7: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> Aug  6 20:10:12 twister kernel: ata7.00: configured for UDMA/133
> Aug  6 20:10:12 twister kernel: ata7: EH complete
> Aug  6 20:10:12 twister kernel: sd 6:0:0:0: [sdc] 488397168 512-byte hardware sectors (250059 MB)
> Aug  6 20:10:12 twister kernel: sd 6:0:0:0: [sdc] Write Protect is off
> Aug  6 20:10:12 twister kernel: sd 6:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> Aug  6 20:10:12 twister kernel: sd 6:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> Aug  6 20:20:25 twister kernel: ata8: EH in ADMA mode, notifier 0x0 notifier_error 0x0 gen_ctl 0x1501000 status 0x400 next cpb count 0x0 next cpb idx 0x0
> Aug  6 20:20:25 twister kernel: ata8: CPB 0: ctl_flags 0x9, resp_flags 0x0
> Aug  6 20:20:25 twister kernel: ata8: timeout waiting for ADMA IDLE, stat=0x400
> Aug  6 20:20:25 twister kernel: ata8: timeout waiting for ADMA LEGACY, stat=0x400
> Aug  6 20:20:25 twister kernel: ata8.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
> Aug  6 20:20:25 twister kernel: ata8.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x0 data 0 
> Aug  6 20:20:25 twister kernel:          res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
> Aug  6 20:20:25 twister kernel: ata8: soft resetting port
> Aug  6 20:20:25 twister kernel: ata8: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> Aug  6 20:20:25 twister kernel: ata8.00: configured for UDMA/133
> Aug  6 20:20:25 twister kernel: ata8: EH complete
> Aug  6 20:20:25 twister kernel: sd 7:0:0:0: [sdd] 488397168 512-byte hardware sectors (250059 MB)
> Aug  6 20:20:25 twister kernel: sd 7:0:0:0: [sdd] Write Protect is off
> Aug  6 20:20:25 twister kernel: sd 7:0:0:0: [sdd] Mode Sense: 00 3a 00 00
> Aug  6 20:20:25 twister kernel: sd 7:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> 
> I also have two Maxtor disks on the same controller but they are working
> correctly in ADMA mode. I now disabled ADMA mode and that seems to help.

Hmmm... That's timeout on cache flush, indicative of failing disk.
Please post the result of 'smartctl -a /dev/sdc'.

-- 
tejun
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