Alan Stern schrieb:
On Mon, 8 Jun 2009, Stefan Sassenberg wrote:
The device is not physically a card reader with a removable medium, it's
an 8GB stick. What's wrong with it?
In short, what's wrong is the device is buggy. However you probably
already know that...
There's no way to tell exactly what's wrong from the information you
provided. We need to see more. Can you provide a usbmon trace
starting from the time you plug the device in and ending with the
failed mount?
And can you provide a similar trace showing it working with 2.6.24?
I put the bad trace to <http://coolmule.de/bad.tar.gz>. When creating
the good trace on the 2.6.24 vm the fdisk also failed. I repeated the
fdisk command and noticed, that it sometimes works, sometimes not. I
made a 'watch "fdisk -l /dev/sdc"' for 40 seconds on the 2.6.29 machine
and had a success rate of 7 out of 20 with no special pattern. The same
watch on the 2.6.24 (sda) had 3 failures and then 17 good runs in a row.
If you'd like to see the trace of the 2.6.24 connect,
<http://coolmule.de/good.tar.gz>, but it's a lot shorter.
Unfortunately the logs don't show the cause of the problem. There is a
different pattern of sector accesses in the two systems, probably
because they have different versions of udev and hal. That might
explain why you see different error rates.
Still, the errors do appear to come more or less at random. (For
instance, even your "good" log contains a bunch of "Medium Not Present"
errors near the start.) I can't tell why. It just looks like the
stick is unreliable.
Have you tried using this stick with other operating systems?
Yes I tried it on Windows 2000 and it worked immediately though I didn't
try to write on it.
Thank you for taking the time. If I can do more to help solving the
problem please let me know.
Stefan
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