Messages in this thread | | | From | Karol Herbst <> | Date | Fri, 19 Aug 2016 22:46:53 +0200 | Subject | Re: mmiotracer hangs the system |
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Hi again,
I was able to get a crash/freeze/something while unbinding/binding my nvidia gpu from nouveau.
Guess that means something is odd. I will investigate this more over the weekend.
2016-08-19 17:35 GMT+02:00 Andy Shevchenko <andy.shevchenko@gmail.com>: > On Fri, Aug 19, 2016 at 6:08 PM, karol herbst <karolherbst@gmail.com> wrote: >> 2016-08-19 15:02 GMT+02:00 Andy Shevchenko <andy.shevchenko@gmail.com>: >>> On Fri, Aug 19, 2016 at 1:35 PM, karol herbst <karolherbst@gmail.com> wrote: >>>> is there any update on that issue I missed somehow? I really don't >>>> want to leave the mmiotracer in a state, where it breaks something >>>> while fixing other issues. >>> >>> No updates. I'm busy right now with more priority tasks and revert >>> works for me. Issue is reproducible in my case 100%. >>> >> >> Is there something I could do with a "normal" haswell desktop system >> to reproduce this issue? > > Try LPSS UART device(s) > >> >> I'll try to play around the next days a bit and maybe I find something >> that works out here as well. It seems to be related to >> unmapping-mapping cycles. > > That is the only thing I would think of. > >> >> Because if this only happens with the pwm-lpss driver, > > It has nothing to do with pwm-lpss since it's a HS UART and served by > intel-lpss driver. > >> it may be >> really troublesome to debug, because I don't really know the code that >> well to be sure where the issue might be. >> >>> So, I would able to attach dmesg in case it would be helpful. >>> Otherwise tell me exact instructions how to debug the issue. >>> >>> Here you are: >>> http://pastebin.com/raw/VfTZENt7 >>> >>>> But for now, without being able to even reproduce the issue, I can't >>>> really do much, because the code in the current state looks sane to >>>> me. Maybe this case includes the mmiotracer cleaning things up and >>>> arms new region for mmiotracing and that's why it fails? Besides that, >>>> I have no idea and no way to reproduce this, so I can't help this way. >>> >>> Maybe. First thing happened is iounmap(). > > > -- > With Best Regards, > Andy Shevchenko
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