linux-kernel - Re: usb-storage, error reading the last 8 sectors, regression in 2.6.25-rc7

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Date:	Mon, 31 Mar 2008 02:32:12 +0400
From:	Sergey Dolgov <dolgovs@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: usb-storage, error reading the last 8 sectors, regression in
	2.6.25-rc7

On Sun, Mar 30, 2008 at 02:59:49PM -0400, Alan Stern wrote:
> On Sun, 30 Mar 2008, Sergey Dolgov wrote:
> 
> > Hi!
> > 
> > If I boot Asus Eee PC with 8 Gb Transcend SDHC card inserted into the
> > internal card reader, 2.6.25-rc7 prints the following:
> > 
> >    [    9.914968] scsi 2:0:0:0: Direct-Access     USB2.0   CardReader SD0   0100 PQ: 0 ANSI: 0
> >    [   10.248951] sd 2:0:0:0: [sdb] 15660032 512-byte hardware sectors (8018 MB)
> >    [   10.249695] sd 2:0:0:0: [sdb] Write Protect is off
> >    [   10.249928] sd 2:0:0:0: [sdb] Mode Sense: 03 00 00 00
> >    [   10.249935] sd 2:0:0:0: [sdb] Assuming drive cache: write through
> >    [   10.256632] sd 2:0:0:0: [sdb] 15660032 512-byte hardware sectors (8018 MB)
> >    [   10.257440] sd 2:0:0:0: [sdb] Write Protect is off
> >    [   10.257546] sd 2:0:0:0: [sdb] Mode Sense: 03 00 00 00
> >    [   10.257552] sd 2:0:0:0: [sdb] Assuming drive cache: write through
> >    [   10.257657]  sdb: sdb1 sdb2 sdb3
> >    [   10.259560] sd 2:0:0:0: [sdb] Attached SCSI removable disk
> >    [   10.260489] usb-storage: device scan complete
> >    [   10.380590] sd 2:0:0:0: [sdb] Result: hostbyte=0x00 driverbyte=0x08
> >    [   10.380590] sd 2:0:0:0: [sdb] Sense Key : 0x4 [current] 
> >    [   10.380590] sd 2:0:0:0: [sdb] ASC=0x11 ASCQ=0x0
> >    [   10.380590] end_request: I/O error, dev sdb, sector 15660024
> > 
> > As a result, no sdb device is created by udev.
> > 
> > If the card is inserted after the boot, it sometimes works fine (I've
> > tested with "dd if=/dev/sdb of=/dev/null bs=512 skip=15660000"), and
> > sometimes fails in the same way (the same I/O error message, dd
> > hangs).
> > 
> > 2.6.24.4 is fine (no problems at boot, always can dd read the whole
> > card, all 15660032 sectors of it).
> > 
> > The other SD card I've got, 2 Gb, also works ok even with 2.6.25-rc7.
> 
> Can you build both 2.6.24.4 and 2.6.25-rc7 with
> CONFIG_USB_STORAGE_DEBUG enabled, and post the dmesg logs from both
> kernels showing what happens when the SDHC card is probed during boot?
> Comparing the two logs should indicate where the crucial difference 
> lies.

The dmesg output for 2.6.25-rc7 with USB storage debugging enabled is
attached. I hope to produce the same for 2.6.24.4 on Monday.

-- 
Sergey

View attachment "dmesg.25.8G-dbg" of type "text/plain" (71043 bytes)