Re: ahci + software raid (intel E7221, supermicro P8SCT) causes kernel BUG at drivers/scsi/scsi.c:295

[Brad Barnett <lists@l8r.net>]

I've narrowed this down to a faulty SATA drive.  It performed at 1/4th the
speed of my other drives, and eventually would disintegrate and remain
non-responsive for long periods of time.

Still, what happened below is probably not the desired behaviour in
response to a dead drive. :/

On Thu, 15 Dec 2005 11:21:55 -0500
Brad Barnett <lists@l8r.net> wrote:

> 
> Is there any additional information anyone would like?  Any suggestions
> on this bug?  I currently have a reproducible problem, on a system I can
> monkey with for the next week or two.
> 
> After that, it will have to move into production, and I won't be able to
> do much with it. :/  
> 
> Thanks
> 
> 
> -------------------------------
> 
> 
> Supermicro P8SCT:
> 
> http://supermicro.com/products/motherboard/P4/E7221/P8SCT.cfm
> 
> (uses intel E7221/ahci for SATA controller).  Hot-swap raid cage.  Three
> SATA ports in use.  Also have two MegaRAID SATA 150-6 onboard, one in
> PCI-X slot.
> 
> This box will run stable, but at inconsistent times lock up.  After
> hooking up serial console, we discovered the problem.
> 
> FYI, we have three different motherboards from Supermicro, and they all
> exhibit the same issue... it is unlikely a fault with our specific
> hardware.
> 
> It is easiest to trigger this bug (not certain if this is the only way)
> when running software raid, two drives, in stripe mode.  Many times this
> configuration will cause no isses, other times I get this:
> 
>   ata2: handling error/timeout
> ata2: port reset, p_is 0 is 0 pis 0 cmd 4017 tf d0 ss 113 se 0
> ata2: status=0x50 { DriveReady SeekComplete }
> sdb: Current: sense key=0x0
>     ASC=0x0 ASCQ=0x0
> Assertion failed! qc->flags &
> ATA_QCFLAG_ACTIVE,drivers/scsi/libata-core.c,ata_qc_complete,line=351
> 3
> ------------[ cut here ]------------
> kernel BUG at drivers/scsi/scsi.c:295!
> invalid operand: 0000 [#1]
> Modules linked in:
> CPU:    0
> EIP:    0060:[<c02d54c1>]    Not tainted VLI
> EFLAGS: 00010046   (2.6.15-rc2)
> EIP is at scsi_put_command+0x8b/0x95
> eax: f7f69d90   ebx: f7f98680   ecx: f7f9868c   edx: f7f9868c
> esi: f7f8c000   edi: 00000296   ebp: f7f69c00   esp: f7ff7c0c
> ds: 007b   es: 007b   ss: 0068
> Process scsi_eh_3 (pid: 858, threadinfo=f7ff6000 task=f7ea9030)
> Stack: f7f69df8 c0225720 f7f98680 f7f69d90 f7f62dfc f7f62dfc c02d9cdf
> f7f98680       efadda7c f7f98680 00000282 c02d9e05 f7f98680 00000001
> 00000000 efadda7c       f7f98680 00000000 f7f98680 c02da0df f7f98680
> 00000001 00000000 00000001 Call Trace:
>  [<c0225720>] kobject_get+0x1a/0x24
>  [<c02d9cdf>] scsi_next_command+0x2f/0x4f
>  [<c02d9e05>] scsi_end_request+0xc4/0xd6
>  [<c02da0df>] scsi_io_completion+0x19a/0x41e
>  [<c036448e>] sd_rw_intr+0xc6/0x26d
>  [<c02d5bc7>] scsi_finish_command+0x82/0xa2
>  [<c035b708>] ata_scsi_qc_complete+0x47/0x8d
>  [<c0358eb0>] ata_qc_complete+0x40/0xc6
>  [<c035cfd9>] ahci_interrupt+0x107/0x1e3
>  [<c0112089>] activate_task+0x6d/0x80
>  [<c01321d1>] handle_IRQ_event+0x2e/0x64
>  [<c013225a>] __do_IRQ+0x53/0xa5
>  [<c011d606>] update_process_times+0x7b/0x106
>  [<c010455c>] do_IRQ+0x19/0x24
>  [<c0102fda>] common_interrupt+0x1a/0x20
>  [<c0119bc3>] __do_softirq+0x2f/0x8a
>  [<c0119c44>] do_softirq+0x26/0x28
>  [<c0104561>] do_IRQ+0x1e/0x24
>  [<c0102fda>] common_interrupt+0x1a/0x20
>  [<c02daa73>] scsi_request_fn+0x1a9/0x2c2
>  [<c0218c27>] blk_run_queue+0x3a/0x3c
>  [<c02d9ce7>] scsi_next_command+0x37/0x4f
>  [<c02d9e05>] scsi_end_request+0xc4/0xd6
>  [<c02da0df>] scsi_io_completion+0x19a/0x41e
>  [<c036448e>] sd_rw_intr+0xc6/0x26d
>  [<c02d5bc7>] scsi_finish_command+0x82/0xa2
>  [<c035b708>] ata_scsi_qc_complete+0x47/0x8d
>  [<c0358eb0>] ata_qc_complete+0x40/0xc6
>  [<c035cea6>] ahci_eng_timeout+0x85/0xb0
>  [<c02d91fb>] scsi_error_handler+0x0/0x99
>  [<c035af32>] ata_scsi_error+0x1a/0x31
>  [<c02d925a>] scsi_error_handler+0x5f/0x99
>  [<c012706d>] kthread+0xb1/0xb7
>  [<c0126fbc>] kthread+0x0/0xb7
>  [<c0101329>] kernel_thread_helper+0x5/0xb
> Code: 5c 24 08 8b 74 24 0c 89 44 24 1c 8b 7c 24 10 8b 6c 24 14 83 c4 18
> e9 cd b1 fc ff 89 43 0c 89 48 04 31 db 89 51 04 89 4e 14 eb b7 <0f> 0b
> 27 01 3f ce 47 c0 eb 95 57
>  <0>Kernel panic - not syncing: Fatal exception in interrupt
> 
> 
> 
> 
> Put another way, I can setup, prep and create a software raid.. format
> it.. and start to move data onto it.  I can even use it for quite some
> time.  However, once the above happens once, I can not use that software
> raid again until I wipe out the raid and start fresh.  Merely booting
> with the raid in causes the above problem on bootup...
> 
> -
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