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[Po-Hsu Lin <1959424@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 2029405 ***
    https://bugs.launchpad.net/bugs/2029405

** This bug has been marked a duplicate of bug 2029405
   Change in trace file leads to test timeout in ftrace tests on 5.15 ARM64

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https://bugs.launchpad.net/bugs/1959424

Title:
  ubuntu_kernel_selftests / ftrace:ftracetest hangs on arm64 on Jammy
  realtime

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  d2021.10.26/jammy/linux-realtime/5.15.0-1004.4, only on node appleton-kernel.arm64, hangs (timeouts) on ubuntu_kernel_selftests / ftrace:ftracetest test:
  --------
  01:28:34 DEBUG| [stdout] # === Ftrace unit tests ===
  01:28:34 DEBUG| [stdout] # [1] Basic trace file check    [PASS]
  01:28:38 DEBUG| [stdout] # [2] Basic test for tracers    [PASS]
  01:28:38 DEBUG| [stdout] # [3] Basic trace clock test    [PASS]
  01:28:38 DEBUG| [stdout] # [4] Basic event tracing check    [PASS]
  01:28:39 DEBUG| [stdout] # [5] Change the ringbuffer size    [PASS]
  01:28:39 DEBUG| [stdout] # [6] Snapshot and tracing setting    [PASS]
  01:28:40 DEBUG| [stdout] # [7] trace_pipe and trace_marker    [PASS]
  01:28:40 DEBUG| [stdout] # [8] Test ftrace direct functions against tracers    [UNRESOLVED]
  01:28:40 DEBUG| [stdout] # [9] Test ftrace direct functions against kprobes    [UNRESOLVED]
  01:28:40 DEBUG| [stdout] # [10] Generic dynamic event - add/remove eprobe events    [PASS]
  01:28:41 DEBUG| [stdout] # [11] Generic dynamic event - add/remove kprobe events    [PASS]
  01:28:41 DEBUG| [stdout] # [12] Generic dynamic event - add/remove synthetic events    [PASS]
  01:28:41 DEBUG| [stdout] # [13] Generic dynamic event - selective clear (compatibility)    [PASS]
  01:28:41 DEBUG| [stdout] # [14] Generic dynamic event - generic clear event    [PASS]
  01:28:42 DEBUG| [stdout] # [15] Generic dynamic event - check if duplicate events are caught    [PASS]
  01:58:36 INFO | Timer expired (1800 sec.), nuking pid 161336
  --------

  The issue was not reproduced on mcdivitt36 (HP ProLiant m400 server
  cartridge with AppliedMicro X-Gene 64-bit ARM).

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