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[Po-Hsu Lin <2051378@xxxxxxxxxxxxxxxxxx>]

With jammy/linux-gcp-6.5/6.5.0-1017.17~22.04.1 on n2d-standard-4.sev_snp, ubuntu_ltp.cpuhotplug:cpuhotplug02 has passed:
 INFO: Test start time: Sat Mar 16 03:10:32 UTC 2024
 COMMAND:    /opt/ltp/bin/ltp-pan -q  -e -S   -a 422515     -n 422515  -f /tmp/ltp-KBfVFAlKgT/alltests -l /dev/null  -C /dev/null -T /dev/null
 LOG File: /dev/null
 FAILED COMMAND File: /dev/null
 TCONF COMMAND File: /dev/null
 Running tests.......
 Name:   cpuhotplug02
 Date:   Sat Mar 16 03:10:33 UTC 2024
 Desc:   What happens to a process when its CPU is offlined?
 
 CPU is 1
 cpuhotplug02 1 TPASS: turned off CPU 1, process migrated to     CPU   0
 INFO: ltp-pan reported all tests PASS
 LTP Version: 20230929-406-gcbc2d0568
 INFO: Test end time: Sat Mar 16 03:10:45 UTC 2024


But ubuntu_ltp.cpuhotplug:cpuhotplug03 cause the crash this time.

** Tags added: sru-s20240205

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https://bugs.launchpad.net/bugs/2051378

Title:
  cpuhotplug failures on google n2d-standard-4.sev_snp VMs

Status in ubuntu-kernel-tests:
  New

Bug description:
  Testing on n2d-standard-4.sev_snp and possibly other sev_snp enabled
  instances unexpectedly reboot during  cpuhotplug operations. This is
  known to happen during the following tests:

  ubuntu_ftrace_smoke_test.ftrace-smoke-test
  ubuntu_kernel_selftests.cpu-hotplug:cpu-on-off-test.sh
  ubuntu_kselftests_ftrace.ftrace:test.d--00basic--basic2.tc
  ubuntu_ltp.cpuhotplug:cpuhotplug02

  The VM will reboot in most cases interrupting the test. From the
  console logs we see messages like:

  ...
  Jan 25 19:22:13 j-lgcp-gcp-5-15-n2dstd4-sev-snp-u-ftrace-smk-test kernel: [  192.364513] mmiotrace: Disabling non-boot CPUs...
  Jan 25 19:22:13 j-lgcp-gcp-5-15-n2dstd4-sev-snp-u-ftrace-smk-test kernel: [  192.403578] smpboot: CPU 1 is now offline
  Jan 25 19:22:13 j-lgcp-gcp-5-15-n2dstd4-sev-snp-u-ftrace-smk-test kernel: [  192.425028] mmiotrace: CPU1 is down.
  Jan 25 19:22:13 j-lgcp-gcp-5-15-n2dstd4-sev-snp-u-ftrace-smk-test kernel: [  192.447485] smpboot: CPU 2 is now offline
  Jan 25 19:22:13 j-lgcp-gcp-5-15-n2dstd4-sev-snp-u-ftrace-smk-test kernel: [  192.464986] mmiotrace: CPU2 is down.
  Jan 25 19:22:13 j-lgcp-gcp-5-15-n2dstd4-sev-snp-u-ftrace-smk-test kernel: [  192.483908] smpboot: CPU 3 is now offline

  then the VM starts booting again.

  This has been seen on at least linux-gcp 5.15 and 6.5 kernels since
  we've started testing on these n2d-standard-4.sev_snp VMs.

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