I suggest you contact linux-kernel@vger.kernel.org and see what they say.

Matt

On Mon, Dec 24, 2001 at 09:45:51AM -0700, Kyle wrote:
> Matthew Dharm wrote:
> 
> >Yes, I'm still supporting it.
> >
> >Can you recompile your kernel with USB Mass Storage Verbose debugging
> >turned on?
> >
> Hmmm, I have an interesting new development.  I had previously been doing:
> 
>     mount -t vfat /dev/sda1 /mnt/flash
> 
> The device appeared to mount fine, but as soon as I would do:
> 
>     find /mnt/flash
> 
> the system will *hard* lock.  I just put the problem flash in a PCMCIA 
> adapter and stuck it in my laptop.  It is recognized nicely on /dev/hde. 
>  I do:
> 
>     mount -t vfat /dev/hde1 /mnt/flash
> 
> which works ok, but when I do:
> 
>     find /mnt/flash
> 
> the system hard locks just as before (but without usb being involved at 
> all)...
> 
> I looked in syslog and found:
> 
> Dec 24 10:07:08 nb0 kernel:  hde: hde1
> Dec 24 10:07:08 nb0 kernel: FAT: bogus logical sector size 20487
> Dec 24 10:07:08 nb0 kernel: VFS: Can't find a valid FAT filesystem on 
> dev 21:00.
> Dec 24 10:07:08 nb0 kernel:  hde: hde1
> 
> I repeated the test and still got the hard lock, but the error messages 
> about the FAT being messed up are not there.  So I looked back in 
> earlier logs of when I had been trying to mount the usb flash reader and 
> sure enough:  Even though later crashes had yielded no syslog messages, 
> there were earlier ones that did.  Here's a section of syslog:
> 
> Dec 21 19:29:49 nb0 syslogd 1.4.1: restart.
> Dec 21 19:34:44 nb0 su(pam_unix)[1239]: session opened for user root by 
> kyle(uid=1000)
> Dec 21 19:42:46 nb0 apmd[699]: Battery: -0.055762 (0:18) 4294967295 
> days, 4294967291:4294967244 (100% unknown)
> Dec 21 20:06:37 nb0 modprobe: modprobe: Can't locate module char-major-97
> Dec 21 20:06:37 nb0 last message repeated 3 times
> Dec 21 20:07:02 nb0 modprobe: modprobe: Can't locate module freedos
> Dec 21 20:07:09 nb0 modprobe: modprobe: Can't locate module freefat
> Dec 21 20:07:24 nb0 kernel: Attached scsi removable disk sda at scsi0, 
> channel 0, id 0, lun 0
> Dec 21 20:07:24 nb0 kernel: usb-uhci.c: interrupt, status 3, frame# 228
> Dec 21 20:07:24 nb0 kernel: usb-uhci.c: interrupt, status 3, frame# 242
> Dec 21 20:07:24 nb0 kernel: usb-uhci.c: interrupt, status 3, frame# 256
> Dec 21 20:07:24 nb0 kernel: sda : READ CAPACITY failed.
> Dec 21 20:07:24 nb0 kernel: sda : status = 1, message = 00, host = 0, 
> driver = 08
> Dec 21 20:07:24 nb0 kernel: Current sd00:00: sense key Not Ready
> Dec 21 20:07:24 nb0 kernel: Additional sense indicates Medium not present
> Dec 21 20:07:24 nb0 kernel: sda : block size assumed to be 512 bytes, 
> disk size 1GB.
> Dec 21 20:07:24 nb0 kernel:  sda: I/O error: dev 08:00, sector 0
> Dec 21 20:07:24 nb0 kernel:  unable to read partition table
> Dec 21 20:07:24 nb0 kernel: Device not ready.  Make sure there is a disc 
> in the drive.
> Dec 21 20:07:24 nb0 kernel: usb-uhci.c: interrupt, status 3, frame# 292
> Dec 21 20:07:24 nb0 kernel: usb-uhci.c: interrupt, status 3, frame# 306
> Dec 21 20:07:24 nb0 kernel: usb-uhci.c: interrupt, status 3, frame# 320
> Dec 21 20:07:24 nb0 kernel: sda : READ CAPACITY failed.
> Dec 21 20:07:24 nb0 kernel: sda : status = 1, message = 00, host = 0, 
> driver = 08
> Dec 21 20:07:24 nb0 kernel: Current sd00:00: sense key Not Ready
> Dec 21 20:07:24 nb0 kernel: Additional sense indicates Medium not present
> Dec 21 20:07:24 nb0 kernel: sda : block size assumed to be 512 bytes, 
> disk size 1GB.
> Dec 21 20:07:24 nb0 kernel:  sda: I/O error: dev 08:00, sector 0
> Dec 21 20:07:24 nb0 kernel:  unable to read partition table
> Dec 21 20:07:46 nb0 kernel: SCSI device sda: 125185 512-byte hdwr 
> sectors (64 MB)
> Dec 21 20:07:46 nb0 kernel: sda: Write Protect is off
> Dec 21 20:07:46 nb0 kernel:  sda: sda1
> Dec 21 20:12:21 nb0 syslogd 1.4.1: restart.
> 
> I don't understand why later attempts don't log to syslog, but it 
> appears to me that there is data corruption of some kind in this 
> particular flash card.  Every test that's failed had this card involved 
> and other cards have not (yet) failed.
> 
> I'm not sure if I should try reformatting the flash card or if we would 
> lose a valuable chance to find a potential kernel problem.  Is the 
> kernel expected to survive if I mount a corrupt filesystem?
> 
> I realize this sounds like the problem is not in your driver, but do you 
> have any suggestions?
> 
> >
> >
> >On Fri, Dec 21, 2001 at 07:58:17PM -0700, Kyle wrote:
> >
> >>    Are you still supporting the usb-storage code?
> >>
> >>I have some of the SDDR-31 flash readers I'm using under Linux.  They 
> >>seem to work most of the time but when I get a flash card with lots of 
> >>pictures on it, I hard lock the machine when I try to browse the newly 
> >>mounted filesystem.
> >>
> >>I'm running redhat 7.2 (2.4.9 stock kernel).
> >>
> >>Any ideas where to start looking?
> >>
> >
> 
> 

-- 
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

I think the problem is there's a nut loose on your keyboard.
					-- Greg to Customer
User Friendly, 1/5/1999