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[Jürg Häfliger <1927749@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1927749

Title:
  ubuntu_kernel_selftests ftrace fails on arm64 F / aws-5.8 / amd64 F
  azure-5.8

Status in ubuntu-kernel-tests:
  Invalid
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Focal:
  Invalid
Status in linux-aws source package in Focal:
  Fix Released
Status in linux source package in Groovy:
  Won't Fix
Status in linux-aws source package in Groovy:
  Won't Fix
Status in linux source package in Hirsute:
  Fix Released
Status in linux-aws source package in Hirsute:
  Fix Released
Status in linux source package in Impish:
  Fix Released
Status in linux-aws source package in Impish:
  Fix Released

Bug description:
  [Impact]

  arm64 only focal/aws 5.8.0-1031.33~20.04.1-aws and
  5.8.0-1032.34~20.04.1-aws - regression. Works fine on previous Focal
  cycle (5.8.0-1028.30~20.04.3-aws) and current Groovy 5.8.

  12.	05/06 07:01:39 DEBUG| utils:0153| [stdout] TAP version 13
  13.	05/06 07:01:39 DEBUG| utils:0153| [stdout] 1..1
  14.	05/06 07:01:39 DEBUG| utils:0153| [stdout] # selftests: ftrace: ftracetest
  15.	05/06 07:01:39 DEBUG| utils:0153| [stdout] # === Ftrace unit tests ===
  16.	05/06 07:01:39 DEBUG| utils:0153| [stdout] # [1] Basic trace file check [PASS]
  17.	05/06 07:01:41 DEBUG| utils:0153| [stdout] # [2] Basic test for tracers [PASS]
  18.	05/06 07:01:41 DEBUG| utils:0153| [stdout] # [3] Basic trace clock test [PASS]
  19.	05/06 07:01:41 DEBUG| utils:0153| [stdout] # [4] Basic event tracing check [PASS]
  20.	05/06 07:01:42 DEBUG| utils:0153| [stdout] # [5] Change the ringbuffer size [PASS]
  21.	05/06 07:01:42 DEBUG| utils:0153| [stdout] # [6] Snapshot and tracing setting [PASS]
  22.	05/06 07:01:42 DEBUG| utils:0153| [stdout] # [7] trace_pipe and trace_marker [PASS]
  23.	05/06 07:01:42 DEBUG| utils:0153| [stdout] # [8] Test ftrace direct functions against tracers [UNRESOLVED]
  24.	05/06 07:01:43 DEBUG| utils:0153| [stdout] # [9] Test ftrace direct functions against kprobes [UNRESOLVED]
  25.	05/06 07:01:43 DEBUG| utils:0153| [stdout] # [10] Generic dynamic event - add/remove kprobe events [PASS]
  26.	05/06 07:01:43 DEBUG| utils:0153| [stdout] # [11] Generic dynamic event - add/remove synthetic events [PASS]
  27.	05/06 07:01:44 DEBUG| utils:0153| [stdout] # [12] Generic dynamic event - selective clear (compatibility) [PASS]
  28.	05/06 07:01:44 DEBUG| utils:0153| [stdout] # [13] Generic dynamic event - generic clear event [PASS]
  29.	05/06 07:01:44 DEBUG| utils:0153| [stdout] # [14] event tracing - enable/disable with event level files [PASS]
  30.	05/06 07:01:45 DEBUG| utils:0153| [stdout] # [15] event tracing - restricts events based on pid notrace filtering [FAIL]
  31.	05/06 07:01:45 DEBUG| utils:0153| [stdout] # [16] event tracing - restricts events based on pid [PASS]
  32.	05/06 07:01:45 DEBUG| utils:0153| [stdout] # [17] event tracing - enable/disable with subsystem level files [PASS]
  33.	05/06 07:01:46 DEBUG| utils:0153| [stdout] # [18] event tracing - enable/disable with top level files [PASS]

  [Test Plan]

   * Run ftrace test from kernel selftests.

  [Where problems could occur]

   * Only kernel selftests should be affected.
   * ftrace test can have false positives or negatives.

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