On Thu, 28 Dec 2006, Vermont wrote: > Below is the output with USB_DEBUG enabled. > > To trigger the disconnect, I run > > dd if=/dev/sda bs=4096 count=276072 | cat | wc -c
Just out of curiosity, why do you include the "cat" in this pipeline? Not that it's wrong, but it doesn't seem to add anything either. > Can anyone else reproduce this? Typical i/o is probably not intensive > enough to make the problem evident unless you try dd. I usually get > the disconnect before 400M is transfered, and it seems to take longer > with smaller block sizes. Slower USB1 over uhci hasn't triggered the > disconnect yet, after about 4G. > > Once the disconnect occurs, dd hangs in state D, as do attempts to > lsusb, though I suppose this is to be expected. No it isn't. You're seeing a second bug, this time in the VIA USB controller in your computer. Under certain circumstances it loses interrupts. > Dec 28 20:45:31 eggnog kernel: hub 4-0:1.0: state 7 ports 6 chg 0000 evt 0008 > Dec 28 20:45:31 eggnog kernel: ehci_hcd 0000:00:10.3: GetStatus port 3 status > 00180b POWER sig=j PEC CSC CONNECT > Dec 28 20:45:31 eggnog kernel: hub 4-0:1.0: port 3, status 0501, change 0003, > 480 Mb/s > Dec 28 20:45:31 eggnog kernel: usb 4-3: USB disconnect, address 3 > Dec 28 20:45:31 eggnog kernel: usb 4-3: unregistering device > Dec 28 20:45:31 eggnog kernel: usb 4-3: usb_disable_device nuking all URBs > Dec 28 20:45:31 eggnog kernel: ehci_hcd 0000:00:10.3: shutdown urb ec906360 > pipe c0008380 ep1in-bulk > Dec 28 20:46:01 eggnog kernel: usb 4-3: usb_sg_cancel, unlink --> -19 As Pete said, the disconnect was genuine -- caused by the iPod for no apparent reason. Without knowing the cause, I don't see how we can prevent it. The recovery should be smoother, though... That VIA bug has caused difficulties for many people. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
