On Tue, 1 Apr 2014, Dennis New wrote: > On Tue, 1 Apr 2014 09:30:01 -0400 (EDT), Alan Stern wrote: > > On Tue, 1 Apr 2014, Dennis New wrote: > > > > > I was able to capture usbmon output during the event (via a > > > continuously rotating set of log files over a few days :p) from: > > > /sys/kernel/debug/usb/usbmon/3u > > > > Were you using a kernel with the patch that I sent you? Did you have > > CONFIG_USB_DEBUG enabled? Did any of the debugging information show > > up in the kernel log? > > Ugh. I forgot to apply the patch that time. I'll do that now. Apologies. That's okay. And I will expect to wait for quite some time before the next occurrence. > > [...] > > This indicates that the OHCI host controller just stopped working. > > Then about a minute later, the audio device disconnected. > > Yep, that's what happened. I manually disconnected the usb audio device > though. And then tried plugging it back in, but got no response. No response because the hub driver was hung. But something should have shown up in the usbmon trace, depending on how badly the OHCI controller was messed up. Did you stop the trace before plugging the device back in? > > [...] > > > > hcca frame 0xd466 > > > > After the crash, did you notice whether the hcca frame value was > > changing over time? > > I will check for this next time! (At the moment, it seems to increment a > lot each time I cat the "registers" file.) It goes up by one every millisecond, so large jumps (on a human time scale) aren't surprising! 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
