canonical-ubuntu-qa team mailing list archive

[Francis Ginther <2051378@xxxxxxxxxxxxxxxxxx>]

Serial console log from a ubuntu_kselftests_ftrace test run.

** Attachment added: "ubuntu_ftrace_smoke_test-console.log"
   https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/2051378/+attachment/5742658/+files/ubuntu_ftrace_smoke_test-console.log

** Tags added: sru-20231030 sru-20240108

** Summary changed:

- cpuhotplug failures on google seg_snp instances
+ cpuhotplug failures on google n2d-standard-4.sev_snp VMs

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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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