On Sat, 21 Nov 2009, Gennady Kupava wrote: > Hello, guys. > > I've got very annoying problem recently, I'm using vanilla kernel, so I > expect my bug can be handled by someone here. > > 1. One line summary of the problem: > Compete system freeze on unplugging chc-ether device. > > 2. Full description of the problem/report: > My system is freezing on unplugging neo freerunner, which has cdc-ether > over usb interface. Network works fine always. System freezes with 20% > probability, completely, I've tried it on bare console without even > nvidia module loaded or any X11 started. I did 5 plug/unplug and, > without any output it froze. This is reproducible. I have no logs - > nothing is saved on disk in this crashes. > > I had same problem with 2.6.31, rechecked with 2.6.31.5 and with > 2.6.32-rc8, no difference. > I'm unsure what did I done to reveal this problem - not sure I had any > problems before with 2.6.31, something might be changed in other side > kernel. > > Freerunner has custom 2.6.29. > > The freerunner (as other side) works fine after host system crash. > > I've enabled usb debug option in 2.6.32-rc8, seems kernel work a bit > after crash - I were able to press 'ENTER' on non-usb keyboard and got > bash promt '#' after that system hung comletely, no response from > ethernet, acpi power button or so. > > Last log lines on console (i made screen photo as it is not saved): > www.bsdmn.com/tmp/buglog.jpg For the cdc-ether experts, here's a clue. The last kernel message on the screenshot reports a bug. Endpoint 0x81 was being disabled while the completion handler for one of its URBs was still running. Don't ask me how that could have happened. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
