linux-kernel - Re: Error in syslog on 2.6.20

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Message-ID: <20070703113945.GK24385@electro-mechanical.com>
Date:	Tue, 3 Jul 2007 07:39:45 -0400
From:	William Thompson <wt@...ctro-mechanical.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: Error in syslog on 2.6.20

On Tue, Jul 03, 2007 at 04:26:31PM +0900, Tejun Heo wrote:
> William Thompson wrote:
> > I'm not on either list, keep me in CC.
> > 
> > I noticed the following error on a cdrom device:
> > ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
> > ata2.00: cmd a0/00:00:00:00:20/00:00:00:00:00/a0 tag 0 cdb 0x0 data 0
> >          res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
> > ata2: soft resetting port
> > ata2.00: configured for MWDMA2
> > ata2: EH complete
> > 
> > This is the device when it was found:
> > libata version 2.00 loaded.
> > ata_piix 0000:00:1f.1: version 2.00ac7
> > ata1: PATA max UDMA/100 cmd 0x1F0 ctl 0x3F6 bmdma 0xFFA0 irq 14
> > ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xFFA8 irq 15
> > scsi0 : ata_piix
> > ata1.00: ATA-4, max UDMA/66, 16514064 sectors: LBA
> > ata1.00: ata1: dev 0 multi count 8
> > ata1.00: configured for UDMA/66
> > scsi1 : ata_piix
> > ata2.00: ATAPI, max MWDMA2
> > ata2.00: configured for MWDMA2
> > scsi 0:0:0:0: Direct-Access     ATA      WDC WD84AA       05.0 PQ: 0 ANSI: 5
> > scsi 1:0:0:0: CD-ROM            LITEON   CD-ROM LTN486S   YQSM PQ: 0 ANSI: 5
> > 
> > I have a program that does a scsi TEST UNIT READY on many devices once every
> > .1 second.  The problem occured when I ejected the cdrom and closed the tray
> > again with valid media in the drive.  My program noticed media removed and
> > inserted, then said the device was dead/unpollable.  This is when I saw this
> > error.
> 
> Your cd rom failed to complete the TUR command your program issued in
> the specified timeout.  ODDs sometimes take quite long to finish TUR or
> any other command when media is changed.  Did you use sg command or
> cdrom ioctl?

I'm using SG_IO.  I also tested sg3-utils' sg_tur which gave me the same
thing.  Is it just a crappy cdrom?

> Anyways, after timing out, libata EH kicked the cdrom in the ass and
> world peace is restored.

Ah, that's good.
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