Re: [Linux PPC] Disable PREEMPT

[Christian Zigotzky <chzigotzky@xenosoft.de>]

On 09/18/2026 09:10 AM, Michal Suchánek wrote:
> On Fri, Sep 18, 2026 at 04:39:57AM +0200, Christian Zigotzky wrote:
>> On 17/09/26 16:15, Shrikanth Hegde wrote:
>>> Hi Michal,
>>>
>>>>> Give it a try.
>>>>>
>>>>> I am suspecting both lockup, stack corruptions are secondary
>>>>> symptoms here.
>>>>> While recreate, I have different type of traces.
>>>> Yes, it does work for the crash I see.
>>> Thanks. Give me sometime to see further on that. Didn't get any time
>>> today.
>>>
>>>> However, we hijacked the report
>>>> of KVM locking up on FSL Cyrus+, and that is likely a different problem
>>>> still not addressed.
>>>>
>>> Ah, that's what you meant. Yes, i still don't know where FSL Cyrus+ is
>>> stuck.
>>>
>>> I would need help from FSL Cyrus+ to get some logs or is there a way we
>>> can spin of
>>> a QEMU guest of it? We should have the log to start somewhere.
>>>
>>>
>> It's difficult to get a log because it freezes and can't write any error
>> messages to the log files. This bug is very old. We had this issue some
>> years ago but we was able to disable PREEMPT because we don't need it.
> I would expect serial console and sysrq could give something, depending
> on how much of the kernel is frozen.
>
> Thanks
>
> Michal
Here is a serial log: 
https://github.com/user-attachments/files/32433586/e5500_preempt_putty.log

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