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[Launchpad Bug Tracker <1825780@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.15.0-51.55

---------------
linux (4.15.0-51.55) bionic; urgency=medium

  * linux: 4.15.0-51.55 -proposed tracker (LP: #1829219)

  * disable a.out support (LP: #1818552)
    - [Config] Disable a.out support

  * [UBUNTU] qdio: clear intparm during shutdown (LP: #1828394)
    - s390/qdio: clear intparm during shutdown

  * ftrace in ubuntu_kernel_selftests hang with Cosmic kernel (LP: #1826385)
    - kprobes/x86: Fix instruction patching corruption when copying more than one
      RIP-relative instruction

  * touchpad not working on lenovo yoga 530 (LP: #1787775)
    - Revert "UBUNTU: SAUCE: i2c:amd Depends on ACPI"
    - Revert "UBUNTU: SAUCE: i2c:amd move out pointer in union i2c_event_base"
    - Revert "UBUNTU: SAUCE: i2c:amd I2C Driver based on PCI Interface for
      upcoming platform"
    - i2c: add helpers to ease DMA handling
    - i2c: add a message flag for DMA safe buffers
    - i2c: add extra check to safe DMA buffer helper
    - i2c: Add drivers for the AMD PCIe MP2 I2C controller
    - [Config] Update config for AMD MP2 I2C driver
    - [Config] Update I2C_AMD_MP2 annotations

  * tm-unavailable in powerpc/tm failed on Bionic Power9 (LP: #1813129)
    - selftests/powerpc: Check for pthread errors in tm-unavailable
    - selftests/powerpc: Skip tm-unavailable if TM is not enabled

  * cp_abort in powerpc/context_switch from ubunut_kernel_selftests failed on
    Bionic P9 (LP: #1813134)
    - selftests/powerpc: Remove redundant cp_abort test

  * bionic/linux: completely remove snapdragon files from sources (LP: #1827880)
    - [Packaging] remove snapdragon dead files
    - [Config] update configs after snapdragon removal

  * The noise keeps occurring when Headset is plugged in on a Dell machine
    (LP: #1827972)
    - ALSA: hda/realtek - Fixed Dell AIO speaker noise

  * Geneve tunnels don't work when ipv6 is disabled (LP: #1794232)
    - geneve: correctly handle ipv6.disable module parameter

  * There are 4 HDMI/Displayport audio output listed in sound setting without
    attach any HDMI/DP monitor (LP: #1827967)
    - ALSA: hda/hdmi - Read the pin sense from register when repolling
    - ALSA: hda/hdmi - Consider eld_valid when reporting jack event

  * Headphone jack switch sense is inverted: plugging in headphones disables
    headphone output (LP: #1824259)
    - ASoC: rt5645: Headphone Jack sense inverts on the LattePanda board

  * CTAUTO:DevOps:860.50:devops4fp1:Error occurred during LINUX Dmesg error
    Checking for all LINUX clients for devops4p10 (LP: #1766201)
    - SAUCE: integrity: downgrade error to warning

  * Screen freeze after resume from S3 when HDMI monitor plugged on Dell
    Precision 7740 (LP: #1825958)
    - PCI: Restore resized BAR state on resume

  * potential memory corruption on arm64 on dev release (LP: #1827437)
    - driver core: Postpone DMA tear-down until after devres release

  * powerpc/pmu/ebb test in ubuntu_kernel_selftest failed with "error while
    loading shared libraries" on Bionic/Cosmic PowerPC (LP: #1812805)
    - selftests/powerpc/pmu: Link ebb tests with -no-pie

  * unnecessary request_queue freeze (LP: #1815733)
    - block: avoid setting nr_requests to current value
    - block: avoid setting none scheduler if it's already none

  * Kprobe event string type argument failed in ftrace from
    ubuntu_kernel_selftests on B/C i386 (LP: #1825780)
    - selftests/ftrace: Fix kprobe string testcase to not probe notrace function

  * hns: fix socket accounting (LP: #1826911)
    - net: hns: fix skb->truesize underestimation

  * False positive test result in run_netsocktests from net in
    ubuntu_kernel_selftest (LP: #1825777)
    - selftests/net: correct the return value for run_netsocktests

 -- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>  Wed, 15 May
2019 14:48:35 +0200

** Changed in: linux (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu Cosmic)
       Status: Fix Committed => 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 Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Cosmic:
  Fix Released

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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