On 19.01.2015 22:02, Devin Heitmueller wrote: > Hi Mathias, > > Thanks for getting back to me. > >> There are a couple of xhci bugs triggered by dvb devices: >> https://bugzilla.kernel.org/show_bug.cgi?id=75521 >> https://bugzilla.kernel.org/show_bug.cgi?id=65021 >> >> The first one (75521) I believe is mostly fixed by patches in 3.18 and early >> 3.19-rc, so work on a 3.19-rc kernel to eliminate those issues. > > Yeah, I'm already running 3.19-rc1 so I should be in good shape for > the first issue (and I've never seen any errors that resemble those in > the bug report). > >> The second bug (65021) looks more like your case, it queues two stop_endpoints >> commands almost simultaneously, which end up never completing, ->timeout and tear down xhci. >> That bug has a debug patch for command ring status, you could try it out to check if >> the command queue is running among other details. > > The second bug definitely looks like what I'm seeing. I'll try your > tree and report back my findings. Ah, let me rebase that tree on top of a more current kernel first. > >> A verbose xhci dmesg log log using: >> echo -n 'module xhci_hcd =p' > /sys/kernel/debug/dynamic_debug/control >> could give some insight to what's happening > > Just to be clear, the log I provided in my original email actually was > with "xhci_hcd +p", but I'm assuming you mean to provide that log > output after loading up your "for-usb-next-test" tree. > Right, yes logs with the debug patches, and starting earlier to see what happened before xHCI to stopped responding. > I'm happy to ship you a device if you want to reproduce the issue > locally. On my 2014 Macbook Pro all I have to do is plug in the > device and run the tvtime application that ships with most distros, > and it fails 100% of the time within 5 seconds (you don't actually > need a DVB or analog TV source connected to hit the bug). Just email > me your shipping info off-list if you're interested. > I got one device from sundtek. They said they could reproduce the first bug easily, but I couldn't. If the debug output doesn't give any clues then I could be interested in one. -Mathias -- 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
