linux-kernel - Spurious completions during NCQ

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Message-ID: <20080215134658.GB27745@vlad.carfax.org.uk>
Date:	Fri, 15 Feb 2008 13:46:58 +0000
From:	Hugo Mills <hugo-lkml@...fax.org.uk>
To:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Spurious completions during NCQ

   I'm getting these on my Dell Latitude D830:

Feb 15 13:06:00 willow kernel: ata1.00: exception Emask 0x2 SAct 0x4 SErr 0x0 action 0x2 frozen
Feb 15 13:06:00 willow kernel: ata1.00: spurious completions during NCQ issue=0x0 SAct=0x4 FIS=004040a1:00000002
Feb 15 13:06:00 willow kernel: ata1.00: cmd 61/10:10:26:fb:c4/00:00:02:00:00/40 tag 2 cdb 0x0 data 8192 out
Feb 15 13:06:00 willow kernel:          res 40/00:10:26:fb:c4/00:00:02:00:00/40 Emask 0x2 (HSM violation)
Feb 15 13:06:00 willow kernel: ata1: soft resetting port
Feb 15 13:06:00 willow kernel: ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Feb 15 13:06:00 willow kernel: ata1.00: configured for UDMA/133
Feb 15 13:06:00 willow kernel: ata1: EH complete
Feb 15 13:06:00 willow kernel: sd 0:0:0:0: [sda] 312581808 512-byte hardware sectors (160042 MB)
Feb 15 13:06:00 willow kernel: sd 0:0:0:0: [sda] Write Protect is off
Feb 15 13:06:00 willow kernel: sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
Feb 15 13:06:00 willow kernel: sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

   In some cases, there are several cmd/res lines listed. It's
happening about once an hour or so (not correlated with any other
event that I can see). It doesn't seem to be affecting operation of
the machine, but it's making me nervous.

   Can anyone set my mind at rest? (Or suggest a fix?)

uname -a reports:
Linux willow 2.6.23.1-hrt3 #1 SMP Sun Nov 4 14:51:20 GMT 2007 x86_64 GNU/Linux

   It's a kernel.org kernel with the patch for tickless operation on
amd64.

hdparm -i reports:

/dev/sda:

 Model=ST9160823AS                             , FwRev=3.ADC   , SerialNo=            5NK0C448
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=?8?
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 
 AdvancedPM=yes: unknown setting WriteCache=enabled
 Drive conforms to: Unspecified:  ATA/ATAPI-1,2,3,4,5,6,7

 * signifies the current active mode

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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