[Bug 1939127] Re: ubuntu_kernel_selftests:powerpc:subpage_prot_anon: Failed with 3072 errors on Bionic 4.15 P9

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

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https://bugs.launchpad.net/bugs/1939127

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

Status in ubuntu-kernel-tests:
New
Status in The Ubuntu-power-systems project:
New
Status in linux package in Ubuntu:
New
Status in linux source package in Bionic:
New

Bug description:
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]

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