Date:	Sat, 2 Dec 2006 17:17:37 -0800
From:	"Kurtis D. Rader" <krader@...ibm.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives

On Sat, 2006-12-02 01:56:06, Christoph Anton Mitterer wrote:
> The issue was basically the following: I found a severe bug mainly by
> fortune because it occurs very rarely.  My test looks like the following:
> I have about 30GB of testing data on my harddisk,... I repeat verifying
> sha512 sums on these files and check if errors occur.  One test pass
> verifies the 30GB 50 times,... about one to four differences are found in
> each pass.

I'm also experiencing silent data corruption on writes to SATA disks
connected to a Nvidia controller (nForce 4 chipset). The problem is
100% reproducible. Details of my configuration (mainboard model, lspci,
etc.) are near the bottom of this message. What follows is a summation
of my findings.

I have confirmed the corruption is occurring on the writes and not the
reads. Furthermore, if I compare the original and copy while both are
still cached in memory no corruption is found. But as soon as I flush the
pagecache (by reading another file larger than memory) to force the copy
of the file to be read from disk the corruption is seen. The corruption
occurs with direct I/O and normal buffered filesystem I/O (ext3).

Booting with "mem=1g" (system has 4 GiB installed) makes no difference.
So it isn't due to remapping memory above the 4 GiB boundary.  Booting to
single user and ensuring no unnecessary modules (video, etc.) are loaded
also makes no difference.

The problem affects both disks attached to the nVidia SATA controller but
not the two disks attached to the PATA side of the same controller. All
four disks are different models. The same SATA disks attached to
the Silicon Image 3114 SATA RAID controller (on the same mainboard)
experiences the same corruption but at a lower probability.  The same
disks attached to a Promise TX2 SATA controller (in the same system)
experience no corruption.

The system has run memtest86 for 24 hours with no errors.

The corruption occurs with a 32-bit kernel.org 2.6.12 kernel (from a
Knoppix CD), 64-bit kernel.org 2.6.18.1, and 64-bit kernel.org 2.6.19.

The only pattern I can discern is that the corruption only affects the
second four byte block of a sixteen byte aligned region. That is, the
offset of the corrupted bytes always falls in the range 0x...4 to 0x...7.
For example, here are a few representative offsets of corrupted bytes
from one test of many:

    0x020f4554
    0x020f4555
    0x020f4556
    0x020f4557
    0x020f4555
    0x1597f1d4
    0x23034ee5
    0x2dfd08d4
    0x33690b14
    0x33690b15
    0x33690b16
    0x33690b17

Approximately half the corruption involves all four bytes of the second
four byte word of the 16 by aligned region. The remaining instances show
one, two or three bytes being corrupted. There is no pattern that I can
discern to the corruption. It is definitely not anything as simple as the
correct bytes being replaced with zeros or specific bits being forced to
a zero or one state or flipped.  Copying a 2 GiB file typically results
in between five and thirty bytes being corrupted. Back to back tests
copying the same file results in different bytes being corrupted.

The problem appears to be sensitive to the data pattern. Some files can be
copied repeatedly without corruption. But others will exhibit corruption
100% of the time when attached to the nVidia SATA controller and over 50%
of the time when connected to the Sil 3114 controller.

I have tried direct I/O with varying transfer sizes from 1 KiB to 128 KiB
(I have not tried single sector I/O).  Corruption occurs with all block
sizes. If I execute an I/O loop like this the corruption does not appear
to occur:

    while direct read 64 KiB original
        direct write copy
        direct read + verify copy
    done

But that is tentative as I've only done two such tests at this time.

A coworker has hypothesized that this may be a consequence of bus
crosstalk. That it doesn't happen when using the Promise TX2 controller
suggests that if it is a HW bus problem it isn't a hypertransport or
memory bus problem.

Configuration Details
=====================
Mainboard: ASUS A8N-SLI Deluxe with nForce 4 chipset
BIOS:      1016 (original) and 1805 (upgraded to in attempt to resolve)
CPU:       AMD Athlon 64 X2 Dual Core Processor 4400+ stepping 02
Memory:    4 x 1 GiB Kingston matched pairs lifetime warranty
Kernel:    2.6.19 kernel.org (as well as others)
Disks:     Western Digital WD740GD-00FL (10000 rpm "Raptor" disk) 
           Western Digital WD1600JD-32H (7200 rpm)

00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
	Subsystem: ASUSTeK Computer Inc. Unknown device 815a
	Flags: bus master, 66MHz, fast devsel, latency 0
	Capabilities: [44] HyperTransport: Slave or Primary Interface
	Capabilities: [e0] HyperTransport: MSI Mapping

00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev f3)
	Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
	Flags: bus master, 66MHz, fast devsel, latency 0

00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
	Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
	Flags: 66MHz, fast devsel, IRQ 3
	I/O ports at e000 [size=32]
	I/O ports at 4c00 [size=64]
	I/O ports at 4c40 [size=64]
	Capabilities: [44] Power Management version 2

00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2) (prog-if 10 [OHCI])
	Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 5
	Memory at d4003000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [44] Power Management version 2

00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3) (prog-if 20 [EHCI])
	Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 7
	Memory at feb00000 (32-bit, non-prefetchable) [size=256]
	Capabilities: [44] Debug port
	Capabilities: [80] Power Management version 2

00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio Controller (rev a2)
	Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 11
	I/O ports at d800 [size=256]
	I/O ports at dc00 [size=256]
	Memory at d4002000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [44] Power Management version 2

00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2) (prog-if 8a [Master SecP PriP])
	Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
	Flags: bus master, 66MHz, fast devsel, latency 0
	I/O ports at f000 [size=16]
	Capabilities: [44] Power Management version 2

00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3) (prog-if 85 [Master SecO PriO])
	Subsystem: ASUSTeK Computer Inc. Unknown device 815a
	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 11
	I/O ports at 09f0 [size=8]
	I/O ports at 0bf0 [size=4]
	I/O ports at 0970 [size=8]
	I/O ports at 0b70 [size=4]
	I/O ports at d400 [size=16]
	Memory at d4001000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [44] Power Management version 2

00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3) (prog-if 85 [Master SecO PriO])
	Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 5
	I/O ports at 09e0 [size=8]
	I/O ports at 0be0 [size=4]
	I/O ports at 0960 [size=8]
	I/O ports at 0b60 [size=4]
	I/O ports at c000 [size=16]
	Memory at d4000000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [44] Power Management version 2

00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev f2) (prog-if 01 [Subtractive decode])
	Flags: bus master, 66MHz, fast devsel, latency 0
	Bus: primary=00, secondary=05, subordinate=05, sec-latency=128
	I/O behind bridge: 00007000-00009fff
	Memory behind bridge: d2000000-d3ffffff
	Prefetchable memory behind bridge: d4100000-d42fffff

00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
	Capabilities: [40] Power Management version 2
	Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+
	Capabilities: [58] HyperTransport: MSI Mapping
	Capabilities: [80] Express Root Port (Slot+) IRQ 0
	Capabilities: [100] Virtual Channel

00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
	Capabilities: [40] Power Management version 2
	Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+
	Capabilities: [58] HyperTransport: MSI Mapping
	Capabilities: [80] Express Root Port (Slot+) IRQ 0
	Capabilities: [100] Virtual Channel

00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev f3) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	Capabilities: [40] Power Management version 2
	Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+
	Capabilities: [58] HyperTransport: MSI Mapping
	Capabilities: [80] Express Root Port (Slot+) IRQ 0
	Capabilities: [100] Virtual Channel

00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: 0000a000-0000afff
	Memory behind bridge: d0000000-d1ffffff
	Prefetchable memory behind bridge: 00000000c0000000-00000000cff00000
	Capabilities: [40] Power Management version 2
	Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable+
	Capabilities: [58] HyperTransport: MSI Mapping
	Capabilities: [80] Express Root Port (Slot+) IRQ 0
	Capabilities: [100] Virtual Channel

00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
	Flags: fast devsel
	Capabilities: [80] HyperTransport: Host or Secondary Interface

00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
	Flags: fast devsel

00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
	Flags: fast devsel

00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
	Flags: fast devsel

01:00.0 VGA compatible controller: ATI Technologies Inc RV530 [Radeon X1600] (prog-if 00 [VGA])
	Subsystem: VISIONTEK Unknown device 1890
	Flags: bus master, fast devsel, latency 0, IRQ 3
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Memory at d1000000 (64-bit, non-prefetchable) [size=64K]
	I/O ports at a000 [size=256]
	Expansion ROM at d0000000 [disabled] [size=128K]
	Capabilities: [50] Power Management version 2
	Capabilities: [58] Express Endpoint IRQ 0
	Capabilities: [80] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-

01:00.1 Display controller: ATI Technologies Inc RV530 [Radeon X1600] (Secondary)
	Subsystem: VISIONTEK Unknown device 1891
	Flags: fast devsel
	Memory at d1010000 (64-bit, non-prefetchable) [disabled] [size=64K]
	Capabilities: [50] Power Management version 2
	Capabilities: [58] Express Endpoint IRQ 0

05:07.0 Mass storage controller: Promise Technology, Inc. PDC20375 (SATA150 TX2plus) (rev 02)
	Subsystem: Promise Technology, Inc. PDC20375 (SATA150 TX2plus)
	Flags: bus master, 66MHz, medium devsel, latency 96, IRQ 5
	I/O ports at 7000 [size=64]
	I/O ports at 7400 [size=16]
	I/O ports at 7800 [size=128]
	Memory at d3124000 (32-bit, non-prefetchable) [size=4K]
	Memory at d3100000 (32-bit, non-prefetchable) [size=128K]
	Expansion ROM at d4280000 [disabled] [size=16K]
	Capabilities: [60] Power Management version 2

05:08.0 Ethernet controller: Intel Corporation 82557/8/9 [Ethernet Pro 100] (rev 08)
	Subsystem: IBM Netfinity 10/100
	Flags: bus master, medium devsel, latency 32, IRQ 3
	Memory at d3127000 (32-bit, non-prefetchable) [size=4K]
	I/O ports at 7c00 [size=64]
	Memory at d3000000 (32-bit, non-prefetchable) [size=1M]
	Expansion ROM at d4100000 [disabled] [size=1M]
	Capabilities: [dc] Power Management version 2

05:0a.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid] Serial ATA Controller (rev 02)
	Subsystem: ASUSTeK Computer Inc. Unknown device 8167
	Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 7
	I/O ports at 8000 [size=8]
	I/O ports at 8400 [size=4]
	I/O ports at 8800 [size=8]
	I/O ports at 8c00 [size=4]
	I/O ports at 9000 [size=16]
	Memory at d3125000 (32-bit, non-prefetchable) [size=1K]
	Expansion ROM at d4200000 [disabled] [size=512K]
	Capabilities: [60] Power Management version 2

05:0b.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link) (prog-if 10 [OHCI])
	Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
	Flags: bus master, medium devsel, latency 32, IRQ 3
	Memory at d3126000 (32-bit, non-prefetchable) [size=2K]
	Memory at d3120000 (32-bit, non-prefetchable) [size=16K]
	Capabilities: [44] Power Management version 2

-- 
Kurtis D. Rader, Linux level 3 support  email: krader@...ibm.com
IBM Integrated Technology Services      DID: +1 503-578-3714
15300 SW Koll Pkwy, MS RHE2-O2          service: 800-IBM-SERV
Beaverton, OR 97006-6063                http://www.ibm.com
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