ppc32 panic on boot on linux-next

[Laurentiu Tudor]

Hello,

On 10.03.2020 06:44, Michael Ellerman wrote:
> Christophe Leroy <christophe.leroy at c-s.fr> writes:
>> Le 07/03/2020 à 09:42, Christophe Leroy a écrit :
>>> Le 06/03/2020 à 20:05, Nick Desaulniers a écrit :
>>>> As a heads up, our CI went red last night, seems like a panic from
>>>> free_initmem?  Is this a known issue?
>>>
>>> Thanks for the heads up.
>>>
>>> No such issue with either 8xx or book3s/32.
>>>
>>> I've now been able to reproduce it with bamboo QEMU.
>>>
>>> Reverting 2efc7c085f05 makes it disappear. I'll investigate.
>>>
>>
>> Ok, I found the problem. virt_to_kpte() lacks a NULL pmd check. I'll
>> send a patch for that.
>>
>> However, if there is no PMD I guess this area is mapped through some
>> kind of block mapping. Therefore it should bail out of the function through:
>>
>> 	if (v_block_mapped(address))
>> 		return 0;
>>
>>
>> Can someone who knows BOOKE investigate that ?
> 
> Not sure we have anyone left?
> 
> cheers
> 

With latest linux-next, PPC32 Book-E boots to prompt:

https://paste.debian.net/1134272/

---
Best Regards, Laurentiu