Am Mittwoch, den 12.02.2014, 16:57 +0100 schrieb Michael Opdenacker: > On 02/12/2014 04:47 PM, Stefani Seibold wrote: > > Am Mittwoch, den 12.02.2014, 10:37 -0500 schrieb Alan Stern: > >> On Wed, 12 Feb 2014, Stefani Seibold wrote: > >> > >>> Hi, > >>> > >>> Am Dienstag, den 11.02.2014, 11:30 -0500 schrieb Alan Stern: > >>>> On Mon, 10 Feb 2014, Stefani Seibold wrote: > >>>> > >>>>>>> I have more information about the bug. I tested with a USB 3.0 > >>>>>>> Expresscard and this works with 3.13. > >>>>>>> > >>>>>>> I also found an old USB 1.1 HUB in my USB gadget box. When i attach the > >>>>>>> USB flash storage to the USB 1.1 hub there is also no problem. > >>>>>>> > >>>>>>> Since the USB 1.1 Hub is attached to the EHCI we can assume that the bug > >>>>>>> is not in the phy support nor in the USB storage driver. > >>>>>>> > >>>>>>> So i thing the bug must be located in the EHCI HC driver. > >>>>>> Yes, it probably is. Can you build 3.13 with CONFIG_USB_DEBUG enabled? > >>>>>> Maybe some debugging information will show up in the dmesg log and > >>>>>> provide a clue. > >>>>>> > >>>>> I tried the kernel with CONFIG_USB_DEBUG, but i did not get any USB Debug > >>>>> after the computer freeze. > >>>> Did anything show up before the freeze? > >>>> > >>>>> After a minute i get the attached output. Sorry i was only able to do screen > >>>>> shot. > >>>> It looks like something locked ehci->lock and then never unlocked it. > >>>> But from the screen shot, I can't tell where this happened. > >>>> > >>> I was able to get the whole kernel messages via netconsole. I also had > >>> enable CONFIG_USB_DEBUG and all kinds of lock detection. > >>> > >>> > >>> When i attach the USB flash memory (sdc), the system freeze and the > >>> fan's of the machine will get noisy. So i think the CPU is 100 % in use. > >>> > >>> I attach the dmesg output and the current kernel config. > >>> > >>>> Also, I tried to reproduce this failure on my own computer, using > >>>> 3.14-rc1, but everything worked correctly. > >>>> > >>> I will try the 3.14 kernel... But it makes me crazy when a bug > >>> disappears without an explanation. > >> Okay, the debugging info in your dmesg log indicates the cause of the > >> problem. It looks like the bug is related to commit 88ed9fd50e57 > >> (usb/hcd: remove unnecessary local_irq_save) by Michael Opdenacker. > >> > >> (Note: As far as I can tell, the commit itself is okay, but it exposes > >> a bug somewhere else in the kernel.) > >> > >> If you revert that commit from 3.13, does it fix the problem? > >> > > Reverting the commit 88ed9fd50e57 solve the problem. Thank you so much. > Oops, I'll try to reproduce and investigate. Thanks for the > investigations!!! > I think the problem has maybe to do with the threadirqs kernel parameter. - Stefani -- 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
