SATA disks suddenly stop working

[Elliot Schlegelmilch]

Alexander Motin wrote:

[snip]

>>
>> ata2: <ATA channel 0> on atapci1
>> ata2: AHCI reset...: 2
>> ata2: SATA connect time=0ms
>> ata2: ready wait time=0ms52 (12272 MB)
>> ata2: software reset port 15...
>> ata2: ahci_issue_cmd timeout: 100 of 100ms, status=00000001
>> ata2: software reset set timeout
>> ata2: software reset port 0...
>> ata2: ahci_issue_cmd timeout: 100 of 100ms, status=00000001
>> ata2: software reset set timeout
>> ata2: SIGNATURE: ffffffff
>> ata2: Unknown signature, assuming disk device
>> ata2: AHCI reset done: devices=00000001
>> ata2: [MPSAFE]
>> ata2: [ITHREAD]
>>
>> One for each channel, up to ata7. 
> 
> Does it happen during boot or what do you mean by unable to reattach 
> drive now?

Yes, I saw the above during boot. 

What I mean by unable to reattach is describing the old behavior:
Sometimes my ad12 would fall off the bus, and I could usually retrieve
it by 'atacontrol detach ata6; atacontrol attach ata6;'
Now it's: ata6: still BUSY after softreset
and attempting the detach/attach results in:

Tracing pid 12 tid 100007 td 0xffffff0001afb390
device_get_parent() at device_get_parent+0x1
ata_start() at ata_start+0x1c5
ata_reinit() at ata_reinit+0x1dd
ata_completed() at ata_completed+0x75
softclock() at softclock+0x291
intr_event_execute_handlers() at intr_event_execute_handlers+0x68
ithread_loop() at ithread_loop+0xb2
fork_exit() at fork_exit+0x12a
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xfffffffe4004ad40, rbp = 0 ---

This isn't a huge deal, and is probably a red herring, as I suspect
the disk is going bad at this point. This is running Feb 1 kernel, as
I recall. However, it can and has stayed attached for weeks at a time
before.
 
>> atapci0 at pci0:0:31:1:    class=0x01018a card=0x948115d9 chip=0x269e8086 
>> rev=0x09 hdr=0x00
>>     vendor     = 'Intel Corporation'
>>     device     = '631xESB/632xESB/3100 Ultra ATA Storage Controller'
>>     class      = mass storage
>>     subclass   = ATA
>>
>> The last known kernel which works was Dec 17, but trying to rebuild a
>> kernel from that date doesn't see the SATA disks either (as the kernel
>> which sees the disks zfs doesn't work.) Or perhaps I'm csup'ing
>> incorrectly.
> 
> Haven't you tried to just touched reset sequence on 15.

Do you mean a kernel on Feb 15? Was there more that happened between
15th and the 22nd or so?
 
> When you succeed to boot, can you try to make some experiments against 
> HEAD, may be some of them fix the problem:
> 1) comment that line inside ata_ahci_issue_cmd():
>     ATA_OUTL(ctlr->r_res2, ATA_AHCI_P_FBS + offset, (port << 8) | 
> 0x00000001);
> 
> 2) comment these lines inside ata_sata_phy_reset():
>     if ((ATA_IDX_INL(ch, ATA_SCONTROL) & ATA_SC_DET_MASK) == 
> ATA_SC_DET_IDLE)
>     return ata_sata_connect(ch);
> 
> 3) comment first that line inside ata_ahci_softreset():
>     return (-1);
> 
> Thanks.
> 

I'll try these patches and report back right after I freshen up my backups. :)