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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

Passed with Cosmic i386 with proposed kernel.

** Tags removed: verification-needed-cosmic
** Tags added: verification-done-cosmic

** Changed in: ubuntu-kernel-tests
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1825780

Title:
  Kprobe event string type argument failed in ftrace from
  ubuntu_kernel_selftests on B/C i386

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed

Bug description:
  == Justification ==
  When running the ftrace in ubunut_kernel_selftests, the "Kprobe event string type argument" test will fail on Bionic / Cosmic i386:
    [22] Kprobe event string type argument	[FAIL]

  This is because the test was trying to probe a notrace function.
  # grep create_trace_kprobe /sys/kernel/debug/tracing/available_filter_functions

  == Fix ==
  6fc7c411 (selftests/ftrace: Fix kprobe string testcase to not probe notrace function)
  This will change the event to trace in the test, from
  create_trace_kprobe to tracefs_create_dir

  Patch can be cherry-picked for Cosmic.

  For Bionic and Xenial, it can be cherry-picked after the commit
  9855c462 for bug 1812809.

  Although we don't run this ftrace test in Xenial, it will still be a
  plus to fix this.

  It's already been applied in D.

  This patch belongs to a patchset [1], in which further limits kprobe-
  events probing on notrace function. To address this issue for the
  testing tool this one will be suffice.

  [1] https://lkml.org/lkml/2018/7/30/257

  == Test ==
  Patch tested with Bionic / Cosmic i386. Test passed as expected:
    [22] Kprobe event string type argument	[PASS]

  == Regression potential ==
  None.
  This patch is just for the kernel testing tool.

  == Original bug report ==
  Failure spotted on Bionic / Cosmic i386 (node fozzie)

  [22] Kprobe event string type argument  [FAIL]

   selftests: ftrace: ftracetest
   ========================================
   === Ftrace unit tests ===
   [1] Basic trace file check	[PASS]
   [2] Basic test for tracers	[PASS]
   [3] Basic trace clock test	[PASS]
   [4] Basic event tracing check	[PASS]
   [5] Snapshot and tracing setting	[PASS]
   [6] event tracing - enable/disable with event level files	[PASS]
   [7] event tracing - restricts events based on pid	[PASS]
   [8] event tracing - enable/disable with subsystem level files	[PASS]
   [9] event tracing - enable/disable with top level files	[PASS]
   [10] ftrace - function graph filters with stack tracer	[PASS]
   [11] ftrace - function graph filters	[PASS]
   [12] ftrace - function pid filters	[PASS]
   [13] ftrace - test for function event triggers	[PASS]
   [14] ftrace - function profiler with function tracing	[PASS]
   [15] ftrace - test reading of set_ftrace_filter	[PASS]
   [16] ftrace - test for function traceon/off triggers	[PASS]
   [17] Test creation and deletion of trace instances while setting an event	[PASS]
   [18] Test creation and deletion of trace instances	[PASS]
   [19] Kprobe dynamic event - adding and removing	[PASS]
   [20] Kprobe dynamic event - busy event check	[PASS]
   [21] Kprobe dynamic event with arguments	[PASS]
   [22] Kprobe event string type argument	[FAIL]
   [23] Kprobe event argument syntax	[PASS]
   [24] Kprobes event arguments with types	[PASS]
   [25] Kprobe event auto/manual naming	[PASS]
   [26] Kprobe dynamic event with function tracer	[PASS]
   [27] Kretprobe dynamic event with arguments	[PASS]
   [28] Kretprobe dynamic event with maxactive	[PASS]
   [29] Register/unregister many kprobe events	[PASS]
   [30] event trigger - test extended error support	[PASS]
   [31] event trigger - test field variable support	[PASS]
   [32] event trigger - test multiple actions on hist trigger	[PASS]
   [33] event trigger - test inter-event histogram trigger onmatch action	[PASS]
   [34] event trigger - test inter-event histogram trigger onmatch-onmax action [PASS]
   [35] event trigger - test inter-event histogram trigger onmax action	[PASS]
   [36] event trigger - test synthetic_events syntax parser	[PASS]
   [37] event trigger - test event enable/disable trigger	[PASS]
   [38] event trigger - test trigger filter	[PASS]
   [39] event trigger - test histogram modifiers	[PASS]
   [40] event trigger - test multiple histogram triggers	[PASS]
   [41] event trigger - test snapshot-trigger	[PASS]
   [42] event trigger - test stacktrace-trigger	[PASS]
   [43] trace_marker trigger - test snapshot trigger	[PASS]
   [44] trace_marker trigger - test histogram with synthetic event against kernel event	[PASS]
   [45] trace_marker trigger - test histogram with synthetic event	[PASS]
   [46] event trigger - test traceon/off trigger	[PASS]
   [47] (instance) Basic test for tracers	[PASS]
   [48] (instance) Basic trace clock test	[PASS]
   [49] (instance) Snapshot and tracing setting	[PASS]
   [50] (instance) event tracing - enable/disable with event level files	[PASS]
   [51] (instance) event tracing - restricts events based on pid	[PASS]
   [52] (instance) event tracing - enable/disable with subsystem level files	[PASS]
   [53] (instance) ftrace - test for function event triggers	[PASS]
   [54] (instance) ftrace - test for function traceon/off triggers	[PASS]
   [55] (instance) event trigger - test event enable/disable trigger	[PASS]
   [56] (instance) event trigger - test trigger filter	[PASS]
   [57] (instance) event trigger - test histogram modifiers	[PASS]
   [58] (instance) event trigger - test multiple histogram triggers	[PASS]
   [59] (instance) trace_marker trigger - test snapshot trigger	[PASS]

   # of passed: 58
   # of failed: 1
   # of unresolved: 0
   # of untested: 0
   # of unsupported: 0
   # of xfailed: 0
   # of undefined(test bug): 0
   not ok 1..1 selftests: ftrace: ftracetest [FAIL]

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