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[Bug 1942092] [NEW] linux-azure: main(): sched_setscheduler(): Operation not permitted

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Marcelo Cerri <1942092@xxxxxxxxxxxxxxxxxx>
Date: Mon, 30 Aug 2021 14:37:32 -0000
Reply-to: Bug 1942092 <1942092@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Public bug reported:

[Impact]

We have several regressions with RT and ADT with the azure kernels. The
tests seem to fail when calling sched_setscheduler() or with related
operations. This was probably introduced by LP:#1939024 that enabled
CONFIG_RT_GROUP_SCHED.

We should revert this change until we better understand the impact it
can cause.

* ubuntu_ltp_stable

The ltp syscall regression test is failing for all the azure kernels
with:

main(): sched_setscheduler(): Operation not permitted

http://10.246.75.167/2021.08.16/hirsute/linux-azure/5.11.0-1014.15/sru-
azure-azure-Standard_A2_v2-ubuntu_ltp_stable-log.txt

* ubuntu_qrt_apparmor

Error: syscall_setscheduler failed. Test 'syscall_setscheduler --
unconfined' was expected to 'pass'. Reason for failure 'FAIL: Can't set
SCHED_RR: Operation not permitted'

Error: syscall_setscheduler failed. Test 'syscall_setscheduler --
unconfined' was expected to 'pass'. Reason for failure 'FAIL: Can't set
SCHED_RR: Operation not permitted'

* systemd ADT (Hirsute)

https://autopkgtest.ubuntu.com/results/autopkgtest-
hirsute/hirsute/amd64/s/systemd/20210827_233206_a2599@/log.gz

[Test Plan]

The kernel should pass the regression and adt tests.

[Where problems could occur]

** Affects: ubuntu-kernel-tests
     Importance: Undecided
     Assignee: Marcelo Cerri (mhcerri)
         Status: New

** Affects: linux-azure (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-azure-4.15 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-azure-5.11 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-azure-5.4 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-azure-5.8 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-azure (Ubuntu Trusty)
     Importance: Undecided
         Status: New

** Affects: linux-azure-4.15 (Ubuntu Trusty)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.11 (Ubuntu Trusty)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.4 (Ubuntu Trusty)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.8 (Ubuntu Trusty)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: linux-azure-4.15 (Ubuntu Xenial)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.11 (Ubuntu Xenial)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.4 (Ubuntu Xenial)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.8 (Ubuntu Xenial)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure (Ubuntu Bionic)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-4.15 (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: linux-azure-5.11 (Ubuntu Bionic)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.4 (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: linux-azure-5.8 (Ubuntu Bionic)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: linux-azure-4.15 (Ubuntu Focal)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.11 (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: linux-azure-5.4 (Ubuntu Focal)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.8 (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: linux-azure (Ubuntu Hirsute)
     Importance: Undecided
         Status: New

** Affects: linux-azure-4.15 (Ubuntu Hirsute)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.11 (Ubuntu Hirsute)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.4 (Ubuntu Hirsute)
     Importance: Undecided
         Status: Invalid

** Affects: linux-azure-5.8 (Ubuntu Hirsute)
     Importance: Undecided
         Status: Invalid


** Tags: 4.15 5.11 5.4 azure bionic focal hirsute kqa-blocker sru-20210816 trusty ubuntu-ltp-stable ubuntu-qrt-apparmor xenial

** Tags added: 4.15 5.11 5.4 azure bionic focal hirsute kqa-blocker
sru-20210816 trusty ubuntu-ltp-stable ubuntu-qrt-apparmor xenial

** Also affects: linux-azure (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.11 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.4 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux-azure (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.4 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.11 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux-azure (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.4 (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.11 (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: linux-azure (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.4 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.11 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-azure (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.4 (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.11 (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-azure (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.4 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-5.11 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: linux-azure (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: linux-azure-5.11 (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-azure-5.11 (Ubuntu Xenial)
       Status: New => Invalid

** Also affects: linux-azure-4.15 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux-azure-5.11 (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: linux-azure-5.11 (Ubuntu Hirsute)
       Status: New => Invalid

** Changed in: linux-azure-4.15 (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-azure-4.15 (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-azure-4.15 (Ubuntu Focal)
       Status: New => Invalid

** Changed in: linux-azure-4.15 (Ubuntu Hirsute)
       Status: New => Invalid

** Also affects: linux-azure-5.8 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux-azure-5.4 (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-azure-5.4 (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-azure-5.4 (Ubuntu Focal)
       Status: New => Invalid

** Changed in: linux-azure-5.4 (Ubuntu Hirsute)
       Status: New => Invalid

** Changed in: linux-azure-5.8 (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-azure-5.8 (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-azure-5.8 (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: linux-azure-5.8 (Ubuntu Hirsute)
       Status: New => Invalid

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1942092

Title:
  linux-azure: main(): sched_setscheduler(): Operation not permitted

Status in ubuntu-kernel-tests:
  New
Status in linux-azure package in Ubuntu:
  New
Status in linux-azure-4.15 package in Ubuntu:
  New
Status in linux-azure-5.11 package in Ubuntu:
  New
Status in linux-azure-5.4 package in Ubuntu:
  New
Status in linux-azure-5.8 package in Ubuntu:
  New
Status in linux-azure source package in Trusty:
  New
Status in linux-azure-4.15 source package in Trusty:
  Invalid
Status in linux-azure-5.11 source package in Trusty:
  Invalid
Status in linux-azure-5.4 source package in Trusty:
  Invalid
Status in linux-azure-5.8 source package in Trusty:
  Invalid
Status in linux-azure source package in Xenial:
  New
Status in linux-azure-4.15 source package in Xenial:
  Invalid
Status in linux-azure-5.11 source package in Xenial:
  Invalid
Status in linux-azure-5.4 source package in Xenial:
  Invalid
Status in linux-azure-5.8 source package in Xenial:
  Invalid
Status in linux-azure source package in Bionic:
  Invalid
Status in linux-azure-4.15 source package in Bionic:
  New
Status in linux-azure-5.11 source package in Bionic:
  Invalid
Status in linux-azure-5.4 source package in Bionic:
  New
Status in linux-azure-5.8 source package in Bionic:
  Invalid
Status in linux-azure source package in Focal:
  New
Status in linux-azure-4.15 source package in Focal:
  Invalid
Status in linux-azure-5.11 source package in Focal:
  New
Status in linux-azure-5.4 source package in Focal:
  Invalid
Status in linux-azure-5.8 source package in Focal:
  New
Status in linux-azure source package in Hirsute:
  New
Status in linux-azure-4.15 source package in Hirsute:
  Invalid
Status in linux-azure-5.11 source package in Hirsute:
  Invalid
Status in linux-azure-5.4 source package in Hirsute:
  Invalid
Status in linux-azure-5.8 source package in Hirsute:
  Invalid

Bug description:
  [Impact]

  We have several regressions with RT and ADT with the azure kernels.
  The tests seem to fail when calling sched_setscheduler() or with
  related operations. This was probably introduced by LP:#1939024 that
  enabled CONFIG_RT_GROUP_SCHED.

  We should revert this change until we better understand the impact it
  can cause.

  * ubuntu_ltp_stable

  The ltp syscall regression test is failing for all the azure kernels
  with:

  main(): sched_setscheduler(): Operation not permitted

  http://10.246.75.167/2021.08.16/hirsute/linux-
  azure/5.11.0-1014.15/sru-azure-azure-Standard_A2_v2-ubuntu_ltp_stable-
  log.txt

  * ubuntu_qrt_apparmor

  Error: syscall_setscheduler failed. Test 'syscall_setscheduler --
  unconfined' was expected to 'pass'. Reason for failure 'FAIL: Can't
  set SCHED_RR: Operation not permitted'

  Error: syscall_setscheduler failed. Test 'syscall_setscheduler --
  unconfined' was expected to 'pass'. Reason for failure 'FAIL: Can't
  set SCHED_RR: Operation not permitted'

  * systemd ADT (Hirsute)

  https://autopkgtest.ubuntu.com/results/autopkgtest-
  hirsute/hirsute/amd64/s/systemd/20210827_233206_a2599@/log.gz

  [Test Plan]

  The kernel should pass the regression and adt tests.

  [Where problems could occur]

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1942092/+subscriptions
Follow ups

[Bug 1942092] Re: linux-azure: main(): sched_setscheduler(): Operation not permitted
From: Launchpad Bug Tracker, 2021-09-07
[Bug 1942092] Re: linux-azure: main(): sched_setscheduler(): Operation not permitted
From: Launchpad Bug Tracker, 2021-09-07
[Bug 1942092] Re: linux-azure: main(): sched_setscheduler(): Operation not permitted
From: Launchpad Bug Tracker, 2021-09-07