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[Launchpad Bug Tracker <1778642@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lttng-modules - 2.8.0-1ubuntu1~16.04.7

---------------
lttng-modules (2.8.0-1ubuntu1~16.04.7) xenial; urgency=medium

  * ubuntu_lttng_smoke_test failed on Azure 4.15 (LP: #1778642)
    - debian/patches/0041-Fix-do-not-use-CONFIG_HOTPLUG_CPU-for-the-new-hotplu.patch
    - debian/patches/0042-Cleanup-comment-about-CONFIG_HOTPLUG_CPU-ifdef.patch

 -- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>  Thu, 19 Jul
2018 17:47:16 +0200

** Changed in: lttng-modules (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1778642

Title:
  ubuntu_lttng_smoke_test failed on Azure 4.15

Status in ubuntu-kernel-tests:
  Invalid
Status in linux-azure package in Ubuntu:
  Invalid
Status in lttng-modules package in Ubuntu:
  Fix Released
Status in linux-azure source package in Xenial:
  Invalid
Status in lttng-modules source package in Xenial:
  Fix Released
Status in linux-azure source package in Bionic:
  Invalid
Status in lttng-modules source package in Bionic:
  In Progress
Status in linux-azure source package in Cosmic:
  Invalid
Status in lttng-modules source package in Cosmic:
  Fix Released

Bug description:
  SRU Request:

  [Impact]

  After bionic/linux-azure commit
  4fbb658dd8ce96384852ceae18b0b09034de7b36 (UBUNTU: [Config] azure:
  CONFIG_HOTPLUG_CPU=n) the lttng_tracer module cannot find some symbols
  and cannot be loaded.

   kernel: [  639.538251] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
   kernel: [  639.538280] lttng_tracer: Unknown symbol lttng_hp_online (err 0)

  This is caused by lttng-modules incorrectly handling the case when
  CONFIG_HOTPLUG_CPU is not enabled.

  [Test Case]

  Install linux-azure >= 4.15.0-1014, install lttng-modules-dkms and run
  the autotest ubuntu_lttng_smoke_test testcase (or just 'sudo lttng
  list --kernel').

  [Fix]

  commit 894ce5dc825733d1ccab25b1aede9ce0be2a7c4e (Fix: do not use
  CONFIG_HOTPLUG_CPU for the new hotplug API)

  commit 1ee63d8d1b0aaf30564d3879d8e9282d0ddfef1b (Cleanup: comment
  about CONFIG_HOTPLUG_CPU ifdef)

  [Regression Potential]

  Very low. The two patches can be cleanly cherry-picked from the
  upstream commits. The first one that really fixed the issue just
  changes a single #ifdef to compile a piece of code when
  CONFIG_HOTPLUG_CPU is not defined. The second one just updates some
  comments on the code to make them consistent with the changes.

  [Original Description]

  This test will pass with the older kernel, 4.15.0-1013-azure, but not
  the 4.15.0-1014-azure in -proposed.

  It looks like the kernel module can be installed, but four tests have
  failed:

  == lttng smoke test of session create/destroy ==
  Session test-kernel-session created.
  Traces will be written in /tmp/lttng-kernel-trace-14716-session
  PASSED (lttng create)
  Session test-kernel-session destroyed
  PASSED (lttng destroy)

  == lttng smoke test list kernel events ==
  FAILED (lttng list --kernel)
  FAILED (lttng list --kernel more output expected)

  == lttng smoke test trace open/close system calls ==
  Session test-kernel-session created.
  Traces will be written in /tmp/lttng-kernel-trace-14716-session
  PASSED (lttng create)
  FAILED (lttng enable-event)
  Session test-kernel-session destroyed

  == lttng smoke test trace context switches ==
  Session test-kernel-session created.
  Traces will be written in /tmp/lttng-kernel-trace-14716-session
  PASSED (lttng create)
  FAILED (lttng enable-event)
  Session test-kernel-session destroyed

  Summary: 4 passed, 4 failed

  http://10.246.72.46/4.15.0-1014.14-azure/bionic-linux-azure-
  azure-4.15.0-Standard_D12-ubuntu_lttng_smoke_test/ubuntu_lttng_smoke_test/results/ubuntu_lttng_smoke_test
  .lttng-smoke-test/debug/ubuntu_lttng_smoke_test.lttng-smoke-
  test.DEBUG.html

  Error message from /var/log/syslog:

   kernel: [  639.531889] PKCS#7 signature not signed with a trusted key
   kernel: [  639.538251] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
   kernel: [  639.538280] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
   lttng-sessiond[1097]: Error: Unable to load required module lttng-ring-buffer-client-discard
   lttng-sessiond[1097]: Warning: No kernel tracer available
   kernel: [  639.606845] PKCS#7 signature not signed with a trusted key
   kernel: [  639.613331] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
   kernel: [  639.613360] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
   lttng-sessiond[1097]: Error: Unable to load required module lttng-ring-buffer-client-discard
   lttng-sessiond[1097]: Warning: No kernel tracer available
   kernel: [  639.677124] PKCS#7 signature not signed with a trusted key
   kernel: [  639.680857] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
   kernel: [  639.680886] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
   lttng-sessiond[1097]: Error: Unable to load required module lttng-ring-buffer-client-discard
   lttng-sessiond[1097]: Warning: No kernel tracer available
   kernel: [  639.737914] PKCS#7 signature not signed with a trusted key
   kernel: [  639.753366] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
   kernel: [  639.753394] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
   lttng-sessiond[1097]: Error: Unable to load required module lttng-ring-buffer-client-discard
   lttng-sessiond[1097]: Warning: No kernel tracer available
   kernel: [  639.829710] PKCS#7 signature not signed with a trusted key
   kernel: [  639.843736] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
   kernel: [  639.843765] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
   lttng-sessiond[1097]: Error: Unable to load required module lttng-ring-buffer-client-discard
   lttng-sessiond[1097]: Warning: No kernel tracer available

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