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[Po-Hsu Lin <2023381@xxxxxxxxxxxxxxxxxx>]

Hmm f-hwe-generic-64k 5.15.0-74.81~20.04.2 helo-kernel is hanging just
like this one. Not sure if this is hw-related.

** Description changed:

  Issue found on Focal hwe 5.15 generic ARM64k / lowlatency ARM64k
- instances.
+ instance (scobee-kernel).
  
  This is not a regression but a report to follow up with bug 1959424,
  which describes the ftrace hangs on step 16 with ARM64.
  
  Bug 1959424 happens when you try to run the whole
  ubuntu_kernel_selftests test suite with ftracetest in it.
  
  After we're splitting ftracetest out to ubuntu_kselftests_ftrace, it's
  failing on step 19 instead.
  
  Test log:
  05:14:10 DEBUG| Running 'make run_tests -C ftrace TEST_PROGS=ftracetest TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
  05:14:10 DEBUG| [stdout] make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_ftrace/src/linux/tools/testing/selftests/ftrace'
  05:14:10 DEBUG| [stdout] TAP version 13
  05:14:10 DEBUG| [stdout] 1..1
  05:14:10 DEBUG| [stdout] # selftests: ftrace: ftracetest
  05:14:10 DEBUG| [stdout] # === Ftrace unit tests ===
  05:14:10 DEBUG| [stdout] # [1] Basic trace file check    [PASS]
  05:14:15 DEBUG| [stdout] # [2] Basic test for tracers    [PASS]
  05:14:16 DEBUG| [stdout] # [3] Basic trace clock test    [PASS]
  05:14:16 DEBUG| [stdout] # [4] Basic event tracing check    [PASS]
  05:14:16 DEBUG| [stdout] # [5] Change the ringbuffer size    [PASS]
  05:14:17 DEBUG| [stdout] # [6] Snapshot and tracing setting    [PASS]
  05:14:17 DEBUG| [stdout] # [7] trace_pipe and trace_marker    [PASS]
  05:14:17 DEBUG| [stdout] # [8] Test ftrace direct functions against tracers    [UNRESOLVED]
  05:14:17 DEBUG| [stdout] # [9] Test ftrace direct functions against kprobes    [UNRESOLVED]
  05:14:18 DEBUG| [stdout] # [10] Generic dynamic event - add/remove eprobe events    [PASS]
  05:14:18 DEBUG| [stdout] # [11] Generic dynamic event - add/remove kprobe events    [PASS]
  05:14:18 DEBUG| [stdout] # [12] Generic dynamic event - add/remove synthetic events    [PASS]
  05:14:18 DEBUG| [stdout] # [13] Generic dynamic event - selective clear (compatibility)    [PASS]
  05:14:18 DEBUG| [stdout] # [14] Generic dynamic event - generic clear event    [PASS]
  05:14:19 DEBUG| [stdout] # [15] Generic dynamic event - check if duplicate events are caught    [PASS]
  05:14:19 DEBUG| [stdout] # [16] event tracing - enable/disable with event level files    [PASS]
  05:14:19 DEBUG| [stdout] # [17] event tracing - restricts events based on pid notrace filtering    [PASS]
  05:14:20 DEBUG| [stdout] # [18] event tracing - restricts events based on pid    [PASS]
  06:29:15 INFO | Timer expired (4500 sec.), nuking pid 18954

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https://bugs.launchpad.net/bugs/2023381

Title:
  ftracetest in ubuntu_kselftests_ftrace hang with ARM64k kernel on step
  19

Status in ubuntu-kernel-tests:
  New

Bug description:
  Issue found on Focal hwe 5.15 generic ARM64k / lowlatency ARM64k
  instance (scobee-kernel).

  This is not a regression but a report to follow up with bug 1959424,
  which describes the ftrace hangs on step 16 with ARM64.

  Bug 1959424 happens when you try to run the whole
  ubuntu_kernel_selftests test suite with ftracetest in it.

  After we're splitting ftracetest out to ubuntu_kselftests_ftrace, it's
  failing on step 19 instead.

  Test log:
  05:14:10 DEBUG| Running 'make run_tests -C ftrace TEST_PROGS=ftracetest TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
  05:14:10 DEBUG| [stdout] make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_ftrace/src/linux/tools/testing/selftests/ftrace'
  05:14:10 DEBUG| [stdout] TAP version 13
  05:14:10 DEBUG| [stdout] 1..1
  05:14:10 DEBUG| [stdout] # selftests: ftrace: ftracetest
  05:14:10 DEBUG| [stdout] # === Ftrace unit tests ===
  05:14:10 DEBUG| [stdout] # [1] Basic trace file check    [PASS]
  05:14:15 DEBUG| [stdout] # [2] Basic test for tracers    [PASS]
  05:14:16 DEBUG| [stdout] # [3] Basic trace clock test    [PASS]
  05:14:16 DEBUG| [stdout] # [4] Basic event tracing check    [PASS]
  05:14:16 DEBUG| [stdout] # [5] Change the ringbuffer size    [PASS]
  05:14:17 DEBUG| [stdout] # [6] Snapshot and tracing setting    [PASS]
  05:14:17 DEBUG| [stdout] # [7] trace_pipe and trace_marker    [PASS]
  05:14:17 DEBUG| [stdout] # [8] Test ftrace direct functions against tracers    [UNRESOLVED]
  05:14:17 DEBUG| [stdout] # [9] Test ftrace direct functions against kprobes    [UNRESOLVED]
  05:14:18 DEBUG| [stdout] # [10] Generic dynamic event - add/remove eprobe events    [PASS]
  05:14:18 DEBUG| [stdout] # [11] Generic dynamic event - add/remove kprobe events    [PASS]
  05:14:18 DEBUG| [stdout] # [12] Generic dynamic event - add/remove synthetic events    [PASS]
  05:14:18 DEBUG| [stdout] # [13] Generic dynamic event - selective clear (compatibility)    [PASS]
  05:14:18 DEBUG| [stdout] # [14] Generic dynamic event - generic clear event    [PASS]
  05:14:19 DEBUG| [stdout] # [15] Generic dynamic event - check if duplicate events are caught    [PASS]
  05:14:19 DEBUG| [stdout] # [16] event tracing - enable/disable with event level files    [PASS]
  05:14:19 DEBUG| [stdout] # [17] event tracing - restricts events based on pid notrace filtering    [PASS]
  05:14:20 DEBUG| [stdout] # [18] event tracing - restricts events based on pid    [PASS]
  06:29:15 INFO | Timer expired (4500 sec.), nuking pid 18954

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