Bug 16490

Summary: "Assuming drive cache: write through" messages probably have wrong loglevel
Product: IO/Storage Reporter: prikrutil
Component: SCSIAssignee: linux-scsi (linux-scsi)
Status: NEW ---    
Severity: normal CC: a.c.kalker, tj
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.34.1 Subsystem:
Regression: No Bisected commit-id:
Attachments: syslog config file

Description prikrutil 2010-08-01 18:13:54 UTC 
Every time I attach an usb stick, I see some messages like these written to the errors.log:

Jul 22 17:22:42 myhost kernel: sd 4:0:0:0: [sdc] Assuming drive cache: write through
Jul 22 17:22:42 myhost kernel: sd 4:0:0:0: [sdc] Assuming drive cache: write through
Jul 22 17:22:42 myhost kernel: sd 4:0:0:0: [sdc] Assuming drive cache: write through

According to the http://lists.us.dell.com/fom-serve/cache/110.html this isn't actually an error, so these messages shouldn't be written to errors.log. But they are.

It's very annoying to read errors.log flooded by those messages.

I didn't find any mistakes in default syslog-ng.conf (attached) in my system, so maybe the loglevel for these messages is wrong.

Steps to reproduce:

1. Attach any USB flash. I use Transcend JetFlash V60
http://www.transcendusa.com/Products/ModDetail.asp?ModNo=126&SpNo=1&LangNo=0
2. Look at /var/log/errors.log
Comment 1 prikrutil 2010-08-01 18:14:45 UTC 
Created attachment 27312 [details]
syslog config file
Comment 2 prikrutil 2010-08-01 18:15:35 UTC 
Environment
-----------

Disctibution: Archlinux i686 with kernel 2.6.34.1

uname -a: Linux myhost 2.6.34-ARCH #1 SMP PREEMPT Mon Jul 5 21:03:38 UTC 2010 i686 Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz GenuineIntel GNU/Linux

Linux myhost 2.6.34-ARCH #1 SMP PREEMPT Mon Jul 5 21:03:38 UTC 2010 i686 Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz GenuineIntel GNU/Linux

ver_linux output:

Gnu C                  4.5.0
Gnu make               3.81
binutils               2.20.1.20100521
util-linux             2.18
mount                  support
module-init-tools      3.12
e2fsprogs              1.41.12
jfsutils               1.1.14
reiserfsprogs          3.6.21
xfsprogs               3.1.2
pcmciautils            017
PPP                    2.4.5
Linux C Library        2.12
Dynamic linker (ldd)   2.12
Linux C++ Library      6.0.14
Procps                 3.2.8
Net-tools              1.60
Kbd                    1.15.2
Sh-utils               8.5
Modules Loaded         kvm_intel kvm ipv6 vboxdrv snd_hda_codec_realtek joydev snd_seq_dummy snd_seq_oss snd_hda_intel snd_seq_midi_event snd_seq snd_hda_codec snd_seq_device snd_hwdep snd_pcm_oss snd_pcm snd_mixer_oss usbhid hid snd_timer evdev nvidia snd soundcore iTCO_wdt uhci_hcd ppdev ehci_hcd lp intel_agp parport_pc i2c_i801 pcspkr snd_page_alloc iTCO_vendor_support thermal button processor sky2 agpgart serio_raw i2c_core parport usbcore sg rtc_cmos rtc_core rtc_lib ext4 mbcache jbd2 crc16 sr_mod cdrom sd_mod floppy ata_piix pata_acpi ata_generic libata scsi_mod
Comment 3 prikrutil 2010-08-01 18:21:04 UTC 
cat /proc/ioports

0000-0cf7 : PCI Bus 0000:00
  0000-001f : dma1
  0020-0021 : pic1
  0040-0043 : timer0
  0050-0053 : timer1
  0060-0060 : keyboard
  0064-0064 : keyboard
  0070-0073 : rtc0
  0080-008f : dma page reg
  00a0-00a1 : pic2
  00c0-00df : dma2
  00f0-00ff : fpu
  0170-0177 : 0000:00:1f.2
    0170-0177 : ata_piix
  01f0-01f7 : 0000:00:1f.2
    01f0-01f7 : ata_piix
  0290-029f : pnp 00:01
    0290-0294 : pnp 00:01
  0376-0376 : 0000:00:1f.2
    0376-0376 : ata_piix
  0378-037a : parport0
  03c0-03df : vesafb
  03f2-03f2 : floppy
  03f4-03f5 : floppy
  03f6-03f6 : 0000:00:1f.2
    03f6-03f6 : ata_piix
  03f7-03f7 : floppy
  03f8-03ff : serial
  0400-047f : 0000:00:1f.0
    0400-0403 : ACPI PM1a_EVT_BLK
    0404-0405 : ACPI PM1a_CNT_BLK
    0408-040b : ACPI PM_TMR
    0410-0415 : ACPI CPU throttle
    0428-042f : ACPI GPE0_BLK
    0430-0433 : iTCO_wdt
    0460-047f : iTCO_wdt
  0480-04bf : 0000:00:1f.0
  04d0-04d1 : pnp 00:01
  0500-051f : 0000:00:1f.3
    0500-051f : i801_smbus
  0800-087f : pnp 00:01
  0880-088f : pnp 00:01
0cf8-0cff : PCI conf1
0d00-ffff : PCI Bus 0000:00
  8000-8fff : PCI Bus 0000:02
  9000-9fff : PCI Bus 0000:04
  a000-afff : PCI Bus 0000:01
    a000-a07f : 0000:01:00.0
  b000-bfff : PCI Bus 0000:03
    b000-b0ff : 0000:03:00.0
      b000-b0ff : sky2
  c000-c01f : 0000:00:1a.1
    c000-c01f : uhci_hcd
  c400-c41f : 0000:00:1a.0
    c400-c41f : uhci_hcd
  c800-c81f : 0000:00:1d.0
    c800-c81f : uhci_hcd
  cc00-cc1f : 0000:00:1d.1
    cc00-cc1f : uhci_hcd
  d000-d01f : 0000:00:1d.2
    d000-d01f : uhci_hcd
  d800-d807 : 0000:00:1f.5
    d800-d807 : ata_piix
  dc00-dc03 : 0000:00:1f.5
    dc00-dc03 : ata_piix
  e000-e007 : 0000:00:1f.5
    e000-e007 : ata_piix
  e400-e403 : 0000:00:1f.5
    e400-e403 : ata_piix
  e800-e80f : 0000:00:1f.5
    e800-e80f : ata_piix
  ec00-ec0f : 0000:00:1f.5
    ec00-ec0f : ata_piix
  f000-f00f : 0000:00:1f.2
    f000-f00f : ata_piix
  fc00-fc0f : 0000:00:1f.2
    fc00-fc0f : ata_piix
Comment 4 prikrutil 2010-08-01 18:21:31 UTC 
cat /proc/iomem

00000000-00000fff : reserved
00001000-00001fff : System RAM
00002000-0000ffff : reserved
00010000-0009f7ff : System RAM
0009f800-0009ffff : reserved
000a0000-000bffff : PCI Bus 0000:00
  000a0000-000bffff : Video RAM area
000c0000-000dffff : PCI Bus 0000:00
  000c0000-000cedff : Video ROM
  000cee00-000cffff : pnp 00:0c
000e0000-000effff : pnp 00:0c
000f0000-000fffff : reserved
  000f0000-000fffff : System ROM
00100000-7fedffff : System RAM
  01000000-012dc8fb : Kernel code
  012dc8fc-0140adbf : Kernel data
  01474000-0155ad83 : Kernel bss
7fee0000-7fee2fff : ACPI Non-volatile Storage
7fee3000-7feeffff : ACPI Tables
7fef0000-7fefffff : reserved
7ff00000-febfffff : PCI Bus 0000:00
  7ff00000-800fffff : PCI Bus 0000:02
  80100000-802fffff : PCI Bus 0000:02
  80300000-804fffff : PCI Bus 0000:03
    80300000-8031ffff : 0000:03:00.0
  e8000000-efffffff : PCI Bus 0000:01
    e8000000-efffffff : 0000:01:00.0
      e8000000-efffffff : vesafb
  f0000000-f3ffffff : PCI MMCONFIG 0000 [bus 00-3f]
    f0000000-f3ffffff : reserved
      f0000000-f3ffffff : pnp 00:0b
  f4000000-f6ffffff : PCI Bus 0000:01
    f4000000-f4ffffff : 0000:01:00.0
      f4000000-f4ffffff : nvidia
    f5000000-f5ffffff : 0000:01:00.0
    f6000000-f601ffff : 0000:01:00.0
  f7000000-f8ffffff : PCI Bus 0000:03
    f8000000-f8003fff : 0000:03:00.0
      f8000000-f8003fff : sky2
  f9000000-f9003fff : 0000:00:1b.0
    f9000000-f9003fff : ICH HD audio
  f9004000-f90043ff : 0000:00:1a.7
    f9004000-f90043ff : ehci_hcd
  f9005000-f90053ff : 0000:00:1d.7
    f9005000-f90053ff : ehci_hcd
  f9006000-f90060ff : 0000:00:1f.3
fec00000-ffffffff : reserved
  fec00000-fec003ff : IOAPIC 0
  fed00000-fed003ff : HPET 0
  fed10000-fed1dfff : pnp 00:0c
  fed20000-fed8ffff : pnp 00:0c
  fee00000-fee00fff : Local APIC
    fee00000-fee00fff : pnp 00:0c
  ffb00000-ffb7ffff : pnp 00:0c
  fff00000-ffffffff : pnp 00:0c
Comment 5 prikrutil 2010-08-01 18:23:19 UTC 
sudo lspci -vvv

00:00.0 Host bridge: Intel Corporation 82P965/G965 Memory Controller Hub (rev 02)
	Subsystem: Giga-byte Technology Device 5000
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: [e0] Vendor Specific Information: Len=09 <?>
	Kernel modules: intel-agp

00:01.0 PCI bridge: Intel Corporation 82P965/G965 PCI Express Root Port (rev 02) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 32 bytes
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: 0000a000-0000afff
	Memory behind bridge: f4000000-f6ffffff
	Prefetchable memory behind bridge: 00000000e8000000-00000000efffffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [88] Subsystem: Giga-byte Technology Device 5000
	Capabilities: [80] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
		Address: fee0300c  Data: 4141
	Capabilities: [a0] Express (v1) Root Port (Slot+), MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
			ExtTag- RBE+ FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
		LnkCap:	Port #2, Speed 2.5GT/s, Width x16, ASPM L0s, Latency L0 <256ns, L1 <64us
			ClockPM- Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		SltCap:	AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug- Surprise-
			Slot #32, PowerLimit 75.000W; Interlock- NoCompl+
		SltCtl:	Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
			Control: AttnInd Off, PwrInd On, Power- Interlock-
		SltSta:	Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
			Changed: MRL- PresDet+ LinkState-
		RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
		RootCap: CRSVisible-
		RootSta: PME ReqID 0000, PMEStatus- PMEPending-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Capabilities: [140 v1] Root Complex Link
		Desc:	PortNumber=02 ComponentID=01 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=01 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed19000
	Kernel driver in use: pcieport
	Kernel modules: shpchp

00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Giga-byte Technology Device 5004
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 4: I/O ports at c400 [size=32]
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci-hcd

00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Giga-byte Technology Device 5004
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 21
	Region 4: I/O ports at c000 [size=32]
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci-hcd

00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02) (prog-if 20 [EHCI])
	Subsystem: Giga-byte Technology Device 5006
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 18
	Region 0: Memory at f9004000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: [50] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: ehci_hcd
	Kernel modules: ehci-hcd

00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
	Subsystem: Giga-byte Technology Device a002
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 28
	Region 0: Memory at f9000000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: [50] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000fee0300c  Data: 4189
	Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
			ExtTag- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #0, Speed unknown, Width x0, ASPM unknown, Latency L0 <64ns, L1 <1us
			ClockPM- Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; Disabled- Retrain- CommClk-
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed unknown, Width x0, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
		VC1:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=1 ArbSelect=Fixed TC/VC=80
			Status:	NegoPending- InProgress-
	Capabilities: [130 v1] Root Complex Link
		Desc:	PortNumber=0f ComponentID=02 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=02 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed1c000
	Kernel driver in use: HDA Intel
	Kernel modules: snd-hda-intel

00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 32 bytes
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	I/O behind bridge: 00008000-00008fff
	Memory behind bridge: 7ff00000-800fffff
	Prefetchable memory behind bridge: 0000000080100000-00000000802fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [40] Express (v1) Root Port (Slot+), MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
			ExtTag- RBE+ FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #1, Speed 2.5GT/s, Width x1, ASPM L0s, Latency L0 <1us, L1 <4us
			ClockPM- Surprise- LLActRep+ BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk-
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x0, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		SltCap:	AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+
			Slot #16, PowerLimit 10.000W; Interlock- NoCompl-
		SltCtl:	Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
			Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock-
		SltSta:	Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet- Interlock-
			Changed: MRL- PresDet- LinkState-
		RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
		RootCap: CRSVisible-
		RootSta: PME ReqID 0000, PMEStatus- PMEPending-
	Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
		Address: fee0300c  Data: 4149
	Capabilities: [90] Subsystem: Giga-byte Technology Device 5001
	Capabilities: [a0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed+ WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Capabilities: [180 v1] Root Complex Link
		Desc:	PortNumber=01 ComponentID=02 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=02 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed1c001
	Kernel driver in use: pcieport
	Kernel modules: shpchp

00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 (rev 02) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 32 bytes
	Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
	I/O behind bridge: 0000b000-0000bfff
	Memory behind bridge: f7000000-f8ffffff
	Prefetchable memory behind bridge: 0000000080300000-00000000804fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [40] Express (v1) Root Port (Slot+), MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
			ExtTag- RBE+ FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #5, Speed 2.5GT/s, Width x1, ASPM L0s, Latency L0 <256ns, L1 <4us
			ClockPM- Surprise- LLActRep+ BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive+ BWMgmt- ABWMgmt-
		SltCap:	AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+
			Slot #20, PowerLimit 10.000W; Interlock- NoCompl-
		SltCtl:	Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
			Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock-
		SltSta:	Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
			Changed: MRL- PresDet+ LinkState+
		RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
		RootCap: CRSVisible-
		RootSta: PME ReqID 0000, PMEStatus- PMEPending-
	Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
		Address: fee0300c  Data: 4151
	Capabilities: [90] Subsystem: Giga-byte Technology Device 5001
	Capabilities: [a0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed+ WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Capabilities: [180 v1] Root Complex Link
		Desc:	PortNumber=05 ComponentID=02 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=02 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed1c001
	Kernel driver in use: pcieport
	Kernel modules: shpchp

00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Giga-byte Technology Device 5004
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 23
	Region 4: I/O ports at c800 [size=32]
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci-hcd

00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Giga-byte Technology Device 5004
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 19
	Region 4: I/O ports at cc00 [size=32]
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci-hcd

00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Giga-byte Technology Device 5004
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 18
	Region 4: I/O ports at d000 [size=32]
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci-hcd

00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02) (prog-if 20 [EHCI])
	Subsystem: Giga-byte Technology Device 5006
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 23
	Region 0: Memory at f9005000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: [50] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: ehci_hcd
	Kernel modules: ehci-hcd

00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev f2) (prog-if 01 [Subtractive decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Bus: primary=00, secondary=04, subordinate=04, sec-latency=32
	I/O behind bridge: 00009000-00009fff
	Memory behind bridge: fff00000-000fffff
	Prefetchable memory behind bridge: 00000000fff00000-00000000000fffff
	Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [50] Subsystem: Giga-byte Technology GA-EP45-DS5 Motherboard

00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC Interface Controller (rev 02)
	Subsystem: Giga-byte Technology Device 5001
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: [e0] Vendor Specific Information: Len=0c <?>
	Kernel modules: iTCO_wdt

00:1f.2 IDE interface: Intel Corporation 82801H (ICH8 Family) 4 port SATA IDE Controller (rev 02) (prog-if 8a [Master SecP PriP])
	Subsystem: Giga-byte Technology Device b002
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 19
	Region 0: I/O ports at 01f0 [size=8]
	Region 1: I/O ports at 03f4 [size=1]
	Region 2: I/O ports at 0170 [size=8]
	Region 3: I/O ports at 0374 [size=1]
	Region 4: I/O ports at f000 [size=16]
	Region 5: I/O ports at fc00 [size=16]
	Capabilities: [70] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold-)
		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: ata_piix
	Kernel modules: ata_piix

00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
	Subsystem: Giga-byte Technology Device 5001
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin C routed to IRQ 18
	Region 0: Memory at f9006000 (32-bit, non-prefetchable) [size=256]
	Region 4: I/O ports at 0500 [size=32]
	Kernel driver in use: i801_smbus
	Kernel modules: i2c-i801

00:1f.5 IDE interface: Intel Corporation 82801H (ICH8 Family) 2 port SATA IDE Controller (rev 02) (prog-if 85 [Master SecO PriO])
	Subsystem: Giga-byte Technology Device b002
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 19
	Region 0: I/O ports at d800 [size=8]
	Region 1: I/O ports at dc00 [size=4]
	Region 2: I/O ports at e000 [size=8]
	Region 3: I/O ports at e400 [size=4]
	Region 4: I/O ports at e800 [size=16]
	Region 5: I/O ports at ec00 [size=16]
	Capabilities: [70] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold-)
		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: ata_piix
	Kernel modules: ata_piix

01:00.0 VGA compatible controller: nVidia Corporation G73 [GeForce 7600 GT] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: Giga-byte Technology GV-NX76T128D-RH
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at f4000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at e8000000 (64-bit, prefetchable) [size=128M]
	Region 3: Memory at f5000000 (64-bit, non-prefetchable) [size=16M]
	Region 5: I/O ports at a000 [size=128]
	[virtual] Expansion ROM at f6000000 [disabled] [size=128K]
	Capabilities: [60] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
		Address: 0000000000000000  Data: 0000
	Capabilities: [78] Express (v1) Endpoint, MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s <256ns, L1 <4us
			ExtTag- AttnBtn- AttnInd- PwrInd- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 512 bytes
		DevSta:	CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <256ns, L1 <4us
			ClockPM- Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Capabilities: [128 v1] Power Budgeting <?>
	Kernel driver in use: nvidia
	Kernel modules: nvidia, nouveau, nvidiafb

03:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8056 PCI-E Gigabit Ethernet Controller (rev 12)
	Subsystem: Giga-byte Technology Device e000
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 27
	Region 0: Memory at f8000000 (64-bit, non-prefetchable) [size=16K]
	Region 2: I/O ports at b000 [size=256]
	[virtual] Expansion ROM at 80300000 [disabled] [size=128K]
	Capabilities: [48] Power Management version 3
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
	Capabilities: [50] Vital Product Data
		Product Name: Marvell Yukon 88E8056 Gigabit Ethernet Controller
		Read-only fields:
			[PN] Part number: Yukon 88E8056
			[EC] Engineering changes: Rev. 1.2
			[MN] Manufacture ID: 4d 61 72 76 65 6c 6c
			[SN] Serial number: AbCdEfG861EEE
			[CP] Extended capability: 01 10 cc 03
			[RV] Reserved: checksum good, 9 byte(s) reserved
		Read/write fields:
			[RW] Read-write area: 121 byte(s) free
		End
	Capabilities: [5c] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000fee0300c  Data: 4161
	Capabilities: [e0] Express (v1) Legacy Endpoint, MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
			ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 512 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <256ns, L1 unlimited
			ClockPM+ Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk-
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
	Capabilities: [100 v1] Advanced Error Reporting
		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UESvrt:	DLP+ SDES- TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
		AERCap:	First Error Pointer: 1f, GenCap- CGenEn- ChkCap- ChkEn-
	Kernel driver in use: sky2
	Kernel modules: sky2
Comment 6 prikrutil 2010-08-01 18:58:46 UTC 
Here is discussion on Arch Linux forum: https://bbs.archlinux.org/viewtopic.php?id=102015

Looks like, Dieter@be found what is wrong:

"the important thing to mention is your syslog config.
Ie this part:
destination d_errors { file("/var/log/errors.log"); };
(...)
g { source(src); filter(f_err); destination(d_errors); };
so these messages are f_err, which is weird"
Comment 7 Tejun Heo 2010-08-05 14:07:38 UTC 
Reassigning to SCSI.  Thanks.
Comment 8 Alain Kalker 2014-06-04 14:19:03 UTC 
I submitted a patch to lower the log level to the linux-scsi mailing list.
The patch was not accepted; James Bottomley offered this very insightful explanation why the log level should remain high (quoted here for those who are not reading the linux-scsi mailing list):

> [...] The condition may be an error.  We have
> some USB attached storage devices with writeback caches which don't
> supply caching information.  Treating a writeback device as writethrough
> is a potential error because you may lose data as a result of it.
> 
> The error is that we've made an assumption which may damage your data.
> 
> The problem for us is that we can't tell if the assumption is going to
> be fatal or not ... the message is harmless for older USB devices.

From doing a little research, I would suggest these steps to mitigate the risk (correct me if I'm wrong or have omitted anything):

- Find out if the device has write cache enabled by default, by consulting its documentation, technical specifications, or by contacting the manufacturer.
- If the device does have write cache enabled, a quirk parameter can be added to either the kernel commandline or as a module parameter for the usb-storage module[1]
- Verify that the device works as expected.

[1] For more information on USB storage device quirks and how to configure them, see linux/Documentation/kernel-parameters.txt in the Linux kernel source.