This bug was fixed in the package linux - 4.15.0-115.116
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linux (4.15.0-115.116) bionic; urgency=medium
* bionic/linux: 4.15.0-115.116 -proposed tracker (LP: #1893055)
* [Potential Regression] dscr_inherit_exec_test from powerpc in
ubuntu_kernel_selftests failed on B/E/F
This bug was fixed in the package linux - 5.4.0-45.49
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linux (5.4.0-45.49) focal; urgency=medium
* focal/linux: 5.4.0-45.49 -proposed tracker (LP: #1893050)
* [Potential Regression] dscr_inherit_exec_test from powerpc in
ubuntu_kernel_selftests failed on B/E/F (LP:
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
focal' to 'verification-done-focal'. If the problem still exists, change
the tag
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1888332
Title:
[Potential Regression]
** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => High
** Changed in: linux (Ubuntu Focal)
Importance: High => Medium
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
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** Changed in: linux (Ubuntu Bionic)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1888332
Title:
[Potential Regression] dscr_inherit_exec_test
** Description changed:
+ [Impact]
+ Code that touches DSCR user MSR does not set dscr_inherit, which breaks DSCR
restore doing context switches and inheritance when forking. DSCR is used to
control cache hinting. This is caused by lack of kernel interrupt when the DSCR
user MSR is written,
Apparently, cherry-picking 0828137e8f16721842468e33df0460044a0c588b
("powerpc/64s: Don't init FSCR_DSCR in __init_FSCR()") fixes the issue.
Which explains why 5.8 does not show the problem.
Building a kernel with that patch applied so I can test it.
Cascardo.
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** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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Title:
[Potential Regression] dscr_inherit_exec_test from
** Also affects: ubuntu-kernel-tests/trunk
Importance: Undecided
Status: New
** No longer affects: ubuntu-kernel-tests
** No longer affects: ubuntu-kernel-tests/trunk
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu
This test failure is caused by the kernel not setting dscr_inherit when
the user dscr MSR is written to. Which is caused by FSCR not raising a
facility unavailable interrupt. Which is ironic as one of the other
patches that is backported is 993e3d96fd08c3ebf7566e43be9b8cd622063e6d
("powerpc/64s:
** Changed in: linux (Ubuntu Eoan)
Status: Incomplete => Confirmed
** Changed in: linux (Ubuntu Eoan)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
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A bisect for arch/powerpc/ shows this is the first bad commit on 4.15:
$ git bisect bad
7d10952e8a56f87a53fc57594078555a9dfd4a07 is the first bad commit
commit 7d10952e8a56f87a53fc57594078555a9dfd4a07
Author: Michael Ellerman
Date: Thu May 28 00:58:42 2020 +1000
powerpc/64s: Save FSCR to
Note for Bionic P9, this test didn't fail on node baltar.
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Title:
[Potential Regression] dscr_inherit_exec_test from powerpc in
On Bionic P8, I can reproduce this issue against proposed kernel
(4.15.0-114.115) with source code in 4.15.0-112. Indicating this might
be a kernel issue instead of a test case issue.
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