On Mit, 2013-05-08 at 15:40 +0000, Ming Lei wrote: > On Wed, May 8, 2013 at 10:12 PM, Robert <[email protected]> wrote: > > On Mit, 2013-05-08 at 12:25 +0000, Ming Lei wrote: > >> From the usbmon in correct case, there is no any ATA commands > >> at all. I am not sure where these commands are from(user space > >> or kernel?) in the failure case. > > > > I suspect it's strictly kernel - I didn't even mount the drive. Mounting > > is definitely possible (the drive works fine), but I wanted to show the > > minimal difference. > > No, in fact, the scsi layer(sd, kernel) has already read the 4 sectors from > the device successfully, then one inquiry command and some RAW ATA > commands are sent to device, and the disk starts to behave badly. It is > very possible that these commands are sent from userspace when the scsi > disk device shows up and udevd got the notification. And these commands > aren't sent to the device absolutely on precise. > > Looks some utilities(smartctl, hdparm) may do that.
I used no smartctl or hdparm. It is possible that udevd may have sent something. > > > >> Could you install the upstream 3.9.0 kernel images on 12.04 to > >> see if the HDD can work well? > > > > Sorry, not possible (production machine). I also don't see what would it > > bring, as the machine with 13.04 that shows the errors was working fine > > with 12.04. > > Sorry to see that, but you already installed 3.9.0 upstream kernel on > raring(13.04), > right? I am wondering there is any difference to install 3.9.0 kernel on > 12.04. Yes, I sent you the usbmon and dmesg for the patched 3.9.0 on raring. The 12.04 machine is a production server, so I'd rather not play around with it. I used it just to make sure the removable disk is working OK. I still don't understand what information you hope to get from that: I assure you that the test machine worked OK with precise and stopped working with raring. -- Robert -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1176355 Title: Can't access USB external disk To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1176355/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
