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[Hui Wang <2089721@xxxxxxxxxxxxxxxxxx>]

And also reproduced the issue on j:linux-gcp-6.8


It seems this test is flaky on vm environment.

under a vm, if we increase the testing percentage, this timeout will happen sooner or later:
sth like: sudo /usr/bin/timeout "600" ./mem-on-off-test.sh -r 20

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https://bugs.launchpad.net/bugs/2089721

Title:
  mem-on-off-test from memory-hotplug in ubuntu_kernel_selftests fails
  with timeout while offlining (Flaky)

Status in ubuntu-kernel-tests:
  New

Bug description:
  Flaky timeout failure was observed on builder-cpu2-ram4-disk20.
  mem-on-off-test from memory-hotplug fails with timeout (without blocked task (ref. LP: #1923113) and any other relevant kernel messages).

  -------------------
  10:59:54 DEBUG| [stdout] # timeout set to 600
  10:59:54 DEBUG| [stdout] # selftests: memory-hotplug: mem-on-off-test.sh
  10:59:54 DEBUG| [stdout] # Test scope: 2% hotplug memory
  10:59:54 DEBUG| [stdout] # 	 online all hot-pluggable memory in offline state:
  10:59:54 DEBUG| [stdout] # 		 SKIPPED - no hot-pluggable memory in offline state
  10:59:54 DEBUG| [stdout] # 	 offline 2% hot-pluggable memory in online state
  10:59:54 DEBUG| [stdout] # 	 trying to offline 1 out of 32 memory block(s):
  10:59:54 DEBUG| [stdout] # online->offline memory0
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory1
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory10
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory11
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory12
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory13
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory14
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory15
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory16
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory17
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory18
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory19
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory2
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory20
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory21
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory22
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory23
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory3
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory32
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory33
  10:59:54 DEBUG| [stdout] # -> Failure
  10:59:54 DEBUG| [stdout] # online->offline memory34
  11:09:54 DEBUG| [stdout] #
  11:09:54 DEBUG| [stdout] not ok 1 selftests: memory-hotplug: mem-on-off-test.sh # TIMEOUT 600 seconds

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