That's exactly what Alan Stern told me on linux-usb when he looked at my trace:
(quoting from here: https://bugs.launchpad.net/ubuntu/+source/udev/+bug/515023 I filed it against udev because Alan suggested some rule(s) there might be the cause of it.) I took the problem to the linux-usb list and submitted a usbmon trace. Alan Stern looked at it and he found these entries suspicious: > ffff88001b083e40 2655717029 S Bo:2:015:2 -115 31 = 55534243 21000000 00000000 > 00001085 06200005 00fe0000 00000000 40ef00 > ffff88001b083e40 2655717090 C Bo:2:015:2 0 31 > > ffff88001b083e40 2655717123 S Bi:2:015:1 -115 13 < > ffff88001b083e40 2655731738 C Bi:2:015:1 0 13 = 55534253 21000000 00000000 00 > ffff88001b083e40 2655732007 S Bo:2:015:2 -115 31 = 55534243 22000000 00020000 > 80001085 082e0000 00000000 00000000 40ec00 > ffff88001b083e40 2655732099 C Bo:2:015:2 0 31 > > ffff8800afe263c0 2655732126 S Bi:2:015:1 -115 512 < > ffff8800afe263c0 2655748859 C Bi:2:015:1 -121 13 = 55534253 22000000 00020000 > 00 > ffff88001b083e40 2655748906 S Bi:2:015:1 -115 13 < > ffff88001b083e40 2663266469 C Bi:2:015:1 -104 0 >From Alan's comment on it: "The shows a sequence of two ATA pass-through commands being sent to the device. I don't know what those commands are or what program was responsible for sending them; as far as I'm aware nothing in the kernel will do it. Perhaps some program started by udev is responsible. Looking through your udev rules might pinpoint the culprit. Anyway, the first command doesn't seem to cause any difficulty, but the second command fails completely. Instead of sending data in its response, the device sends a status message. The kernel gets this, thinks it is data, and then waits for the status to come -- which of course never happens. So the kernel resets the device and tries issuing the same command again, with the same result." -- usb storage with ext4 does not work in lucid on imx51 hardware https://bugs.launchpad.net/bugs/499881 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
