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[Jürg Häfliger <2090819@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/2090819

Title:
  cpuset_hotplug failed on N-aws  since 6.8.0-1017-aws on AWS x1e.xlarge

Status in ubuntu-kernel-tests:
  New
Status in linux-aws package in Ubuntu:
  New
Status in linux-aws source package in Noble:
  New

Bug description:
  Issue found on 6.8.0-1020.20, looking back into our test history we
  can see it's failing with 6.8.0-1018.20 on the same instance in
  sru-20240930.

  And it has passed with 6.8.0-1015.16 in sru-20240805 and 6.8.0-1016.17
  in sru-s20240805

  A manual test shows this failure begins with 6.8.0-1017-aws

  Test result with 6.8.0-1016.17:
  <<<test_start>>>
  tag=cpuset_hotplug stime=1733121824
  cmdline="cpuset_hotplug_test.sh"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  cpuset_hotplug 1 TINFO: CPUs are numbered continuously starting at 0 (0-3)
  cpuset_hotplug 1 TINFO: Nodes are numbered continuously starting at 0 (0)
  cpuset_hotplug 1 TCONF: Could not mount cgroup filesystem with cpuset on /dev/cpuset
  <<<execution_status>>>
  initiation_status="ok"
  duration=0 termination_type=exited termination_id=32 corefile=no
  cutime=1 cstime=1
  <<<test_end>>>

  Test result with 6.8.0-1017:
  <<<test_start>>>
  tag=cpuset_hotplug stime=1733122053
  cmdline="cpuset_hotplug_test.sh"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  cpuset_hotplug 1 TINFO: CPUs are numbered continuously starting at 0 (0-3)
  cpuset_hotplug 1 TINFO: Nodes are numbered continuously starting at 0 (0)
  cpuset_hotplug 1 TPASS: Cpuset vs CPU hotplug test succeeded.
  /bin/echo: write error: Input/output error
  cpuset_hotplug 3 TINFO: /bin/echo: write error: Input/output error
  cpuset_hotplug 3 TFAIL:  CPU#1 failed.
  /bin/echo: write error: Input/output error
  cpuset_hotplug 5 TINFO: /bin/echo: write error: Invalid argument
  cpuset_hotplug 5 TFAIL: set general group parameter failed.
  /bin/echo: write error: Input/output error
  cpuset_hotplug 7 TINFO: /bin/echo: write error: Invalid argument
  cpuset_hotplug 7 TFAIL: set general group parameter failed.
  /bin/echo: write error: Input/output error
  cpuset_hotplug 9 TPASS: Cpuset vs CPU hotplug test succeeded.
  /bin/echo: write error: Input/output error
  cpuset_hotplug 11 TINFO: /bin/echo: write error: Input/output error
  cpuset_hotplug 11 TFAIL:  CPU#1 failed.
  /bin/echo: write error: Input/output error
  <<<execution_status>>>
  initiation_status="ok"
  duration=82 termination_type=exited termination_id=1 corefile=no
  cutime=136 cstime=1168
  <<<test_end>>>

  This failure will cause the following cpuset_regression_test to fail with:
  <<<test_start>>>
  tag=cpuset_regression_test stime=1733122896
  cmdline="cpuset_regression_test.sh"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  cpuset_regression_test 1 TINFO: Running: cpuset_regression_test.sh 
  cpuset_regression_test 1 TINFO: Tested kernel: Linux ip-172-31-3-132 6.8.0-1017-aws #18-Ubuntu SMP Wed Oct  2 20:17:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
  cpuset_regression_test 1 TINFO: Using /tmp/ltp-SdsOVtsygU/LTP_cpuset_regression_test.vBePRqZkZM as tmpdir (ext2/ext3 filesystem)
  cpuset_regression_test 1 TINFO: timeout per run is 0h 5m 0s
  tst_cgroup.c:776: TINFO: Mounted V1 cpuset CGroup on /tmp/ltp-SdsOVtsygU/cgroup_cpuset
  cpuset_regression_test 1 TINFO: test starts with cgroup version 1
  /opt/ltp/testcases/bin/cpuset_regression_test.sh: 78: echo: echo: I/O error
  cpuset_regression_test 1 TBROK: Unable to prepare existing cpuset cgroups
  /opt/ltp/testcases/bin/cpuset_regression_test.sh: 111: echo: echo: I/O error
  cpuset_regression_test 1 TINFO: AppArmor enabled, this may affect test results
  cpuset_regression_test 1 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
  cpuset_regression_test 1 TINFO: loaded AppArmor profiles: none

  Summary:
  passed   0
  failed   0
  broken   1
  skipped  0
  warnings 0
  <<<execution_status>>>

  If we don't run the cpuset_hotplug test, this test will be skipped:
  <<<test_start>>>
  tag=cpuset_regression_test stime=1733122991
  cmdline="cpuset_regression_test.sh"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  cpuset_regression_test 1 TINFO: Running: cpuset_regression_test.sh 
  cpuset_regression_test 1 TINFO: Tested kernel: Linux ip-172-31-3-132 6.8.0-1017-aws #18-Ubuntu SMP Wed Oct  2 20:17:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
  cpuset_regression_test 1 TINFO: Using /tmp/ltp-NQZT7RC4j4/LTP_cpuset_regression_test.YG7BLBZW9X as tmpdir (ext2/ext3 filesystem)
  cpuset_regression_test 1 TINFO: timeout per run is 0h 5m 0s
  cpuset_regression_test 1 TINFO: test starts with cgroup version 2
  cpuset_regression_test 1 TCONF: cgroup v2 found, skipping test

  Summary:
  passed   0
  failed   0
  broken   0
  skipped  1
  warnings 0
  <<<execution_status>>>
  initiation_status="ok"
  duration=0 termination_type=exited termination_id=32 corefile=no
  cutime=2 cstime=2
  <<<test_end>>>

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