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

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 [off-list ref] wrote:

quoted

On Wed, 3 Jul 2019 15:54:59 +0530
Sachin Sant [off-list ref] wrote:

quoted

Booting mainline kernel on PowerVM LPAR with vTPM enabled results
into a kernel crash.

[    0.365989] BUG: Kernel NULL pointer dereference at 0x00000012

...

quoted

quoted

[    0.366085] NIP [c00000000073dd80] tpm1_pcr_extend+0x130/0x230
[    0.366090] LR [c00000000073dcd0] tpm1_pcr_extend+0x80/0x230

...

quoted

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