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[Bug 2122541] [NEW] ubuntu_kselftests_ftrace:ftrace:test.d--ftrace--func_hotplug.tc fails on Google TDX

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Tim Whisonant <2122541@xxxxxxxxxxxxxxxxxx>
Date: Wed, 10 Sep 2025 20:06:15 -0000
Reply-to: Bug 2122541 <2122541@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Public bug reported:

Not considered a regression because this behavior was present since the
beginning of TDX testing.

When testing ubuntu_kselftests_ftrace..ftrace:test.d--ftrace--
func_hotplug.tc for plucky:linux-gcp on c3-standard-8.tdx, the test
reports the following:

8273  13:30:32 DEBUG| : Set cpu1 offline/online with function tracer enabled
8274  13:30:32 DEBUG| + echo function
8275  13:30:32 DEBUG| + echo 1
8276  13:30:32 DEBUG| + echo 0
8277  13:30:32 DEBUG| ./ftracetest: 38: echo: echo: I/O error
8278  13:30:32 DEBUG|
8279  13:30:32 DEBUG|
8280  13:30:32 DEBUG| # of passed: 0
8281  13:30:32 DEBUG| # of failed: 1

...

8320   File "/home/ubuntu/autotest/client/shared/utils.py", line 916, in run
8321   raise error.CmdError(command, bg_job.result,
8322   "Command returned non-zero exit status")
8323   autotest.client.shared.error.CmdError: Command <./ftracetest -v test.d/ftrace/func_hotplug.tc> failed, rc=1, Command returned non-zero exit status
8324   * Command:
8325   ./ftracetest -v test.d/ftrace/func_hotplug.tc
8326   Exit status: 1
8327   Duration: 2.842866897583008
8328  
8329   stdout:
8330   === Ftrace unit tests ===
8331   [1] ftrace - function trace across cpu hotplug [FAIL]

...

8441  13:30:33 INFO | END ERROR ubuntu_kselftests_ftrace.ftrace:test.d--
ftrace--func_hotplug.tc ubuntu_kselftests_ftrace.ftrace:test.d--ftrace--
func_hotplug.tc timestamp=1757511033 localtime=Sep 10 13:30:33

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2122541

Title:
  ubuntu_kselftests_ftrace:ftrace:test.d--ftrace--func_hotplug.tc fails
  on Google TDX

Status in ubuntu-kernel-tests:
  New

Bug description:
  Not considered a regression because this behavior was present since
  the beginning of TDX testing.

  When testing ubuntu_kselftests_ftrace..ftrace:test.d--ftrace--
  func_hotplug.tc for plucky:linux-gcp on c3-standard-8.tdx, the test
  reports the following:

  8273  13:30:32 DEBUG| : Set cpu1 offline/online with function tracer enabled
  8274  13:30:32 DEBUG| + echo function
  8275  13:30:32 DEBUG| + echo 1
  8276  13:30:32 DEBUG| + echo 0
  8277  13:30:32 DEBUG| ./ftracetest: 38: echo: echo: I/O error
  8278  13:30:32 DEBUG|
  8279  13:30:32 DEBUG|
  8280  13:30:32 DEBUG| # of passed: 0
  8281  13:30:32 DEBUG| # of failed: 1

  ...

  8320   File "/home/ubuntu/autotest/client/shared/utils.py", line 916, in run
  8321   raise error.CmdError(command, bg_job.result,
  8322   "Command returned non-zero exit status")
  8323   autotest.client.shared.error.CmdError: Command <./ftracetest -v test.d/ftrace/func_hotplug.tc> failed, rc=1, Command returned non-zero exit status
  8324   * Command:
  8325   ./ftracetest -v test.d/ftrace/func_hotplug.tc
  8326   Exit status: 1
  8327   Duration: 2.842866897583008
  8328  
  8329   stdout:
  8330   === Ftrace unit tests ===
  8331   [1] ftrace - function trace across cpu hotplug [FAIL]

  ...

  8441  13:30:33 INFO | END ERROR ubuntu_kselftests_ftrace.ftrace:test.d
  --ftrace--func_hotplug.tc ubuntu_kselftests_ftrace.ftrace:test.d--
  ftrace--func_hotplug.tc timestamp=1757511033 localtime=Sep 10 13:30:33

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