Raspberry Pi2 kernel warnings

[Svatopluk Kraus]

On Tue, Dec 1, 2015 at 12:01 AM, Karl Denninger <karl at denninger.net> wrote:
> And.... now it's dead again.
>
> This may not be related to the patch.... however, the kernel does appear
> to use the bcm2835.... so while the patch may not be the cause something
> is going on here that's not kosher....
>
> The espeak process is killable but if I had to guess it's waiting for
> what it thinks is a busy I/O to become free.


I have the same problem with omxplayer. No idea what could be behind
it. There is about 8 omxplayer's thread, one is in select, all others
are waiting on some user locks.

>
> Any ideas on running this down?
>
> On 11/28/2015 13:43, Karl Denninger wrote:
>> That appears to have fixed it; espeak is again working.
>>
>> On 11/27/2015 17:20, Svatopluk Kraus wrote:
>>> Well, I cannot imagine now how my patch could be the cause of that
>>> except that sdhci is using dma channel #4 now, but it was #2, which is
>>> said to be used by GPU. And channels used by GPU are not initialized
>>> now. Try to apply the attached fix just to be sure.
>>>
>>> FYI, my video playback freezed up after more than 12 hours of playing
>>> today, so there could be some problem in communication with GPU, not
>>> my patch related.
>>>
>>>
>>>
>>> On Fri, Nov 27, 2015 at 11:39 PM, Karl Denninger <karl at denninger.net> wrote:
>>>> Hmmm... or maybe not.
>>>>
>>>> "espeak" (speech synthesizer) hangs in a "S" state with this change in.
>>>> Not sure if it's the cause but it was working before.
>>>>
>>>>
>>>> On 11/27/2015 13:56, Svatopluk Kraus wrote:
>>>>> OK, Thanks.
>>>>>
>>>>> On Fri, Nov 27, 2015 at 7:09 PM, Karl Denninger <karl at denninger.net> wrote:
>>>>>> The patch still looks good -- it ran overnight without any warnings and
>>>>>> is still grinning.
>>>>>>
>>>>>> On 11/26/2015 23:06, Karl Denninger wrote:
>>>>>>> On 11/26/2015 15:20, Svatopluk Kraus wrote:
>>>>>>>> On Thu, Nov 26, 2015 at 8:08 PM, Karl Denninger <karl at denninger.net> wrote:
>>>>>>>>> I'm getting these on a fairly consistent basis on a Pi that is talking
>>>>>>>>> to a Zwave USB stick and a serial USB interface (two instances that both
>>>>>>>>> show up as serial devices):
>>>>>>>>>
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10007
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10007
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10027
>>>>>>>>> bcm_dma0: unused DMA intr CH=3, CS=20f10007
>>>>>>>>>
>>>>>>>>> They're showing up maybe every half-hour or so.... doesn't appear to be
>>>>>>>>> doing anything bad, other than displaying the message.....
>>>>>>>>>
>>>>>>>> I'm just finished a patch which works well for me. I plan to commit it
>>>>>>>> after some more testing. The patch is attached if you want to test it
>>>>>>>> too.
>>>>>>>>
>>>>>>>> Svatopluk Kraus
>>>>>>>>
>>>>>>> I have the patch loaded on on the Pi that is exhibiting the problem --
>>>>>>> so far looks good.
>>>>>>>
>>>>>> --
>>>>>> Karl Denninger
>>>>>> karl at denninger.net <mailto:karl at denninger.net>
>>>>>> /The Market Ticker/
>>>>>> /[S/MIME encrypted email preferred]/
>>>> --
>>>> Karl Denninger
>>>> karl at denninger.net <mailto:karl at denninger.net>
>>>> /The Market Ticker/
>>>> /[S/MIME encrypted email preferred]/
>
> --
> Karl Denninger
> karl at denninger.net <mailto:karl at denninger.net>
> /The Market Ticker/
> /[S/MIME encrypted email preferred]/