Re: Odroid U2 Kernel 4.7rc7+ Hang on reboot

[Tobias Jakobi <tjakobi@math.uni-bielefeld.de>]

Hey,

Krzysztof Kozlowski wrote:
> On 07/15/2016 09:55 AM, Krzysztof Kozlowski wrote:
>>>> Nicolas Dufresne wrote:
>>>>> Le jeudi 14 juillet 2016 à 15:37 -0400, Nicolas Dufresne a écrit :
>>>>>> Hi,
>>>>>>
>>>>>> I'm using the Odroid U2 to test some features implemented in
>>>>>> GStreamer.
>>>>>> The parts I need mostly works in mainline kernel, my main
>>>>>> annoyance
>>>>>> ist
>>>>>> that reboot hangs.
>>>>>>
>>>>>> Is this issue known ? I'm booting from SD card is that matters.
>>>>>> Any
>>>>>> advise would be appreciated. I'm not list member, so please keep
>>>>>> me
>>>>>> in
>>>>>> CC. I'm sharing my .config, in case that is my fault.
>>
>> First of all - use just command "reboot" to restart. It should work. If
>> it doesn't, please let us now.
>>
>> I was able to reproduce your issue - OOPS in emergency restart - also in
>> my configuration (U3 + eMMC + network boot).
>>
>> It is weird... I'll take a look at it.
> 
> Actually I did not encounter OOPS of yours. I was able to reproduce a
> failure to reboot on U3. XU3 reboots fine. It might be related to pwrseq...
I'm not sure how much that helps, but I can't reproduce any of this on
my X2 (which is quite closely related to the U2/U3).
I'm only encountering non-working reboot when applying Marek's latest
IOMMU runpm patchset.


> The failure seems to be present for long time, at least since v4.2. I am
> in progress of testing more releases.
At least not for the X2, and I'm booting from a sdcard like Nicolas.
IIRC then pwrseq only plays a role for booting from eMMC.


> ext4 backtrace present in your OOPs might be related to improper reboot.
> Even for emergency reboot you should first sync, then remount ro and
> finally reboot (so sysrq: sub).
I currently don't have access to my UART adapater, but I'll try to
reproduce the Oops by issuing a reboot SysRq directly.


With best wishes,
Tobias


> Best Regards,
> Krzysztof
>