# Re: Kernel Bug/oops during boot (PowerVM LPAR w/vTPM)

- From: Nayna \<hidden\>
- Date: 2019-07-04 03:38:26 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2019/07/9510827
- Thread: https://ratatoskr.run/linuxppc-dev/2019/07/9510807/t.md

```text
Hi Sachin and Michal,


On 07/03/2019 05:15 PM, Michal Suchánek wrote:
> On Wed, 3 Jul 2019 13:17:16 +0200
> Michal Suchánek [ref] wrote:
>
>> On Wed, 3 Jul 2019 15:54:59 +0530
>> Sachin Sant [ref] wrote:
>>
>>> Booting mainline kernel on PowerVM LPAR with vTPM enabled results
>>> into a kernel crash.
>>>
>>> [    0.365989] BUG: Kernel NULL pointer dereference at 0x00000012
> ...
>>> [    0.366085] NIP [c00000000073dd80] tpm1_pcr_extend+0x130/0x230
>>> [    0.366090] LR [c00000000073dcd0] tpm1_pcr_extend+0x80/0x230
> ...
>> You need to revert (or fix up) commit 0b6cf6b97b7e ("tpm: pass an array
>> of tpm_extend_digest structures to tpm_pcr_extend()". At least
>> reverting it fixes the issue for me.
> FTR this is the revert on lkml https://lkml.org/lkml/2019/7/1/423
>
>


I have just now posted the fix for this to the mailing list and copied both of you. I would appreciate your testing and confirming that the patch "tpm: fixes uninitialized allocated banks for IBM vtpm driver" addresses this bug.

Thanks & Regards,
      - Nayna


```