ubuntu_kernel_selftests:powerpc:subpage_prot_anon: Failed with 3072 errors on Bionic 4.15 P9

[Stefan Bader]

On host baltar with bionic:linux 4.15 for 2021.07.19 (but already same in prev cycle):

...
[stdout] Failed at 0x72353a232000 (p=1023,sp=2,w=0), want=fault, got=pass !
[stdout] Failed at 0x72353a232000 (p=1023,sp=2,w=1), want=fault, got=pass !
[stdout] 3072 errors detected
[stdout] failure: subpage_prot_anon
[stdout] not ok 1..2 selftests: subpage_prot [FAIL]

[Po-Hsu Lin (cypressyew)]

possible dup lp:1813140, note that this issue is P9 only

[Po-Hsu Lin (cypressyew)]

Also,
there is no further update for this case in the upstream tree. As this is only affecting Power9 it might be something to our bionic kernel.

[Po-Hsu Lin (cypressyew)]

I have mark the old one as duplicated of this one, add some info to the bug title and add related projects / packages.

[Andrew Cloke (andrew-cloke)]

I notice that both this issue and the one in lp:1813140 were both seen on the same P9 system ("baltar"). Can this be reproduced on any other P9 systems?

Does it reliably fail, or does it only fail occasionally?

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1939127

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Frank Heimes (fheimes)]

Since it's end of May 2023, bionic reached it's end of base support.
So can this bug be closed now as 'Won't Fix' or does it need to stay open (for ESM/Pro matters)?